# Best Unified APIs Software - Page 3 ## How Many Unified APIs Software Products Does G2 Track? **Total Products under this Category:** 73 ### Category Stats (Aug 2026) - **Average Rating:** 4.6/5 The average rating of products in this category, based on all submitted ratings - **Top Trending Product:** Agave (+1.76%) - Among all products in this category, Agave recorded the largest rating increase compared to last month _Last updated: August 01, 2026_ ## How Does G2 Rank Unified APIs Software Products? **Why You Can Trust G2's Software Rankings:** - 30 Analysts and Data Experts - 1,800+ Authentic Reviews - 73+ Products - Unbiased Rankings G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category. ## G2 Grid® for Unified APIs Software ![G2 Grid® for Unified APIs Software plotting products by satisfaction and market presence](https://www.g2.com/categories/unified-apis/grids.png?focus%5B%5D=146655&focus%5B%5D=165553&focus%5B%5D=1302378&focus%5B%5D=1224093&focus%5B%5D=159501&focus%5B%5D=1318160&focus%5B%5D=112873&focus%5B%5D=152192) Highlighted products: Merge Unified, Finch, Knit API, Kombo, Apideck Unify, Nango, Smartcar, and Refold. Underlying data: [Grid® JSON](https://www.g2.com/categories/unified-apis/grids.json?focus%5B%5D=merge-unified&focus%5B%5D=finch-finch&focus%5B%5D=knit-api&focus%5B%5D=kombo&focus%5B%5D=apideck-unify&focus%5B%5D=nango&focus%5B%5D=smartcar&focus%5B%5D=refold) **Sponsored** ### Apigee Edge Manage, secure, scale, and analyze your APIs with Apigee Edge [Visit website](https://www.g2.com/external_clickthroughs/record?secure%5Bad_program%5D=ppc&secure%5Bad_slot%5D=category_product_list_llm&secure%5Bcategory_id%5D=1004100&secure%5Bchosen_at%5D=2026-08-01T19%3A40%3A02Z&secure%5Bdisplayable_resource_id%5D=1004100&secure%5Bdisplayable_resource_type%5D=Category&secure%5Bmedium%5D=sponsored&secure%5Bplacement_reason%5D=page_category&secure%5Bplacement_resource_ids%5D%5B%5D=1004100&secure%5Bprioritized%5D=false&secure%5Bproduct_id%5D=13694&secure%5Bresource_id%5D=1004100&secure%5Bresource_type%5D=Category&secure%5Bsource_type%5D=category_page&secure%5Bsource_url%5D=https%3A%2F%2Fwww.g2.com%2Fcategories%2Funified-apis%3Fpage%3D3%26source%3Dsearch&secure%5Btoken%5D=04af2e60a7047549c74ff5df6bab352efe8bf2c180706e1c08bdf29d21833901&secure%5Burl%5D=https%3A%2F%2Fcloud.google.com%2Fapigee%3Futm_source%3DG2%26utm_medium%3Ddisplay%26utm_campaign%3DCloud-SS-DR-GCP-1713658-GCP-DR-NA-US-en-G2-Display-Banner-All-%2525epid%21-%2525ecid%21-apigee%26utm_content%3D%257Bdevice%257D-%257Badgroupid%257D-%257Bnetwork%257D-%257Btargetid%257D-%257Bloc_physical_ms%257D-%257Bcampaignid%257D&secure%5Burl_type%5D=custom_url) ### [Terra API](https://www.g2.com/products/terra-api/reviews) Terra API is the connectivity layer for health apps. It’s a unified API that connects apps to 1000+ wearable devices, sensors, and health sources - Apple Watch, Garmin, Fitbit, Oura, Whoop, Google Fit, Samsung Health, Eight Sleep, Polar, COROS, and dozens more - normalizing everything into a single schema covering 500+ health metrics. Beyond raw data, Terra offers health scores (recovery, strain, stress, immunity), blood lab integrations (home kits and phlebotomy for hormones, vitamins, cholesterol, glucose), and engagement tools (rewards, streaks, gamification). The platform is HIPAA, GDPR, and CCPA compliant, with SOC 2 Type II certification. **Average Rating:** 4.1/5.0 **Total Reviews:** 7 #### How Do G2 Users Rate Terra API? - **Data Processing:** 7.5/10 (Category avg: 8.7/10) - **Ease of Use:** 8.6/10 (Category avg: 8.8/10) - **Integration Breadth:** 8.1/10 (Category avg: 9.0/10) - **Professional Support:** 7.2/10 (Category avg: 9.1/10) #### Who Is the Company Behind Terra API? - **Seller:** [Terra API](https://www.g2.com/sellers/terra-api) - **Year Founded:** 2021 - **HQ Location:** London, GB - **Twitter:** @TerraAPI 1,920 Twitter followers - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=5a39c954e4b74f04b07d39cd1432b54244739d20e16f767319095cf9fb5e5887&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fterraapi&secure%5Burl_type%5D=linkedin_company_website) 20 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 43% Small, 29% Large #### What Are Recent G2 Reviews of Terra API? **["Great Experience with Terra Api"](https://www.g2.com/survey_responses/terra-api-review-10930983)** **Rating:** 4.5/5.0 stars _— Sushant S._ [Read full review](https://www.g2.com/survey_responses/terra-api-review-10930983) **["Easy-to-Use API for Data Integration"](https://www.g2.com/survey_responses/terra-api-review-10917679)** **Rating:** 4.5/5.0 stars _— Abhijeet R._ [Read full review](https://www.g2.com/survey_responses/terra-api-review-10917679) ### [Fastn](https://www.g2.com/products/fastn/reviews) Fastn is a no-code, AI-powered orchestration platform designed to help developers integrate and manage multiple data sources through a unified API. By simplifying the creation of complex integrations, Fastn enables rapid development and deployment of applications, reducing time-to-market and operational costs. **Average Rating:** 4.4/5.0 **Total Reviews:** 6 #### How Do G2 Users Rate Fastn? - **Data Processing:** 9.2/10 (Category avg: 8.7/10) - **Ease of Use:** 8.1/10 (Category avg: 8.8/10) - **Integration Breadth:** 9.4/10 (Category avg: 9.0/10) - **Professional Support:** 7.9/10 (Category avg: 9.1/10) #### Who Is the Company Behind Fastn? - **Seller:** [Fastn](https://www.g2.com/sellers/fastn) - **Year Founded:** 2023 - **HQ Location:** Austin, US - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=ca4903932aa118fd8e6a8f9ca376eb5b3943ac7a3227069ed96063cacf8ea8b5&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Ffastnai&secure%5Burl_type%5D=linkedin_company_website) 24 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 83% Small, 17% Medium #### What Are Recent G2 Reviews of Fastn? **["Fastn’s All-in-One Workflow Builder Gets Agents Working Fast"](https://www.g2.com/survey_responses/fastn-review-12982405)** **Rating:** 4.0/5.0 stars _— Maryam S._ [Read full review](https://www.g2.com/survey_responses/fastn-review-12982405) **["Good integration platform for SaaS companies"](https://www.g2.com/survey_responses/fastn-review-12982985)** **Rating:** 4.0/5.0 stars _— Hassaan B._ [Read full review](https://www.g2.com/survey_responses/fastn-review-12982985) ### [NexHealth](https://www.g2.com/products/nexhealth/reviews) NexHealth is the patient experience platform that provides true practice automation. We help you eliminate the tedious tasks that slows your team down and keeps them tied to the front desk. Our proprietary Synchronizer technology syncs directly with your health record system in real-time, with updates appearing in seconds, not minutes or hours. This unique, reliable sync means you can actually automate every step of the patient journey from booking to payment without the errors and delays common on other platforms. Our patient booking software helps you fill the calendar without endless phone calls. Real-time online booking lets patients schedule 24/7 while our automated Waitlist fills last-minute cancellations in minutes. Bring patients back for the care they need with automated patient recall messages. Our unique 1-Click Booking links makes it easy for patients to schedule follow-ups via SMS or email without a patient portal, saving your team from hours of manual outreach and delighting patients with fewer steps to make an appointment. Handle your entire patient intake process with our HIPAA compliant digital forms software that eliminates the need for paperwork and manual data entry. We digitize your existing forms for you or you can easily create your own with the powerful form builder. Capture all the data you need - from consent, history, payments, and more. Patient information syncs automatically to their record in your EHR, saving you hours of time and reducing data mistakes. Stay on schedule with patients that show up with their intake forms already completed by sending the right forms automatically before each appointment. Next, NexHealth helps you eliminate phone tag with a comprehensive patient communication suite. Automate everything from customizable appointment reminder sequences that reduce no-shows to review requests after appointments that boost your online reputation using feedback from your happiest patients. Our HIPAA-compliant two-way messaging lets your team text directly with patients, ending the game of phone tag for good. Finally, get paid faster with in-office terminals and digital payment requests that sync with your EHR ledger. You can collect outstanding balances with simple text and email payment requests that make it convenient for patients to pay. Ledger Sync instantly shows who has a balance and automatically posts payments back to the patient record with correct provider and procedure attribution, saving hours valuable admin time every week. Free your team from repetitive tasks so they can focus on what matters most: the patients. Get started with flexible, month-to-month billing and no long-term contracts. **Average Rating:** 4.8/5.0 **Total Reviews:** 127 #### How Do G2 Users Rate NexHealth? - **Data Processing:** 10.0/10 (Category avg: 8.7/10) - **Ease of Use:** 9.5/10 (Category avg: 8.8/10) - **Integration Breadth:** 10.0/10 (Category avg: 9.0/10) - **Professional Support:** 10.0/10 (Category avg: 9.1/10) #### Who Is the Company Behind NexHealth? - **Seller:** [Nex Health](https://www.g2.com/sellers/nex-health) - **Company Website:** nexhealth.com - **Year Founded:** 2017 - **HQ Location:** San Francisco, California - **Twitter:** @nexhealthHQ 2,139 Twitter followers - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=dfaa14535ea9887ca2b7523601d44f57d67684c29ffabf3887e8c9fb4fb14ba2&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2F5366106%2F&secure%5Burl_type%5D=linkedin_company_website) 190 employees on LinkedIn® #### Who Uses This Product? - **Who Uses This:** Office Manager, Dentist - **Top Industries:** Hospital & Health Care, Medical Practice - **Company Size:** 90% Small, 9% Medium #### What Do G2 Reviewers Say About NexHealth? _AI-generated summary from verified user reviews_ ##### Pros - Users appreciate the **ease of use** of NexHealth, facilitating seamless communication and efficient payment processing. - Users commend the **responsive customer support** of NexHealth, appreciating quick assistance and effective communication solutions. - Users value the **effective communication tools** of NexHealth, significantly enhancing efficiency and patient interaction in practices. - Users appreciate the **convenience of online forms** with NexHealth, enhancing efficiency in managing patient interactions. - Users value the **ease of patient communication** with NexHealth, enhancing relationships and facilitating effective interactions. ##### Cons - Users face **messaging issues** with NexHealth, experiencing inconvenience and inefficiencies due to lack of automation and complex navigation. - Users often face **technical issues** like lagging and syncing problems, impacting checkout efficiency and user experience. - Users find **limited features** in NexHealth, making tasks cumbersome and requiring multiple workarounds for efficiency. - Users find the **appointment management difficult** due to cumbersome navigation and lack of automated message generation. - Users often face **calendar syncing issues** that result in missing information and technical difficulties. #### What Are Recent G2 Reviews of NexHealth? **["Flexible Insurance, Credit Card, and Messaging Options in Nexhealth"](https://www.g2.com/survey_responses/nexhealth-review-12954504)** **Rating:** 4.0/5.0 stars _— Shawn M._ [Read full review](https://www.g2.com/survey_responses/nexhealth-review-12954504) **["User-Friendly and Time-Saving Dental Practice Solution"](https://www.g2.com/survey_responses/nexhealth-review-13187028)** **Rating:** 5.0/5.0 stars _— Kelsie H._ [Read full review](https://www.g2.com/survey_responses/nexhealth-review-13187028) #### What Are G2 Users Discussing About NexHealth? - [How do you use Nexhealth?](https://www.g2.com/discussions/how-do-you-use-nexhealth) - [How many employees does NexHealth have?](https://www.g2.com/discussions/how-many-employees-does-nexhealth-have) - [Is NexHealth secure?](https://www.g2.com/discussions/is-nexhealth-secure) - [What does NexHealth do?](https://www.g2.com/discussions/what-does-nexhealth-do) ### [Sent](https://www.g2.com/products/sent/reviews) Unified API for A2P Messaging via SMS and apps like WhatsApp, and iMessage. **Average Rating:** 4.9/5.0 **Total Reviews:** 7 #### How Do G2 Users Rate Sent? - **Ease of Use:** 6.7/10 (Category avg: 8.8/10) - **Integration Breadth:** 10.0/10 (Category avg: 9.0/10) - **Professional Support:** 9.4/10 (Category avg: 9.1/10) #### Who Is the Company Behind Sent? - **Seller:** [Sent](https://www.g2.com/sellers/sent) - **Year Founded:** 2024 - **HQ Location:** New York, US - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=6e7a851c31e5777d73a9b44b6f7ff57753e34d05b226012de9a756cf90b3da3f&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2F101156833&secure%5Burl_type%5D=linkedin_company_website) 7 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 100% Small #### What Are Recent G2 Reviews of Sent? **["Simplifies Messaging with Unmatched Ease"](https://www.g2.com/survey_responses/sent-review-12704109)** **Rating:** 5.0/5.0 stars _— Kingsley B._ [Read full review](https://www.g2.com/survey_responses/sent-review-12704109) **["Efficient, High-Density, and Built to Scale for Data-Integrity Workflows"](https://www.g2.com/survey_responses/sent-review-12711905)** **Rating:** 5.0/5.0 stars _— Ahmed M._ [Read full review](https://www.g2.com/survey_responses/sent-review-12711905) ### [Phyllo](https://www.g2.com/products/phyllo/reviews) Phyllo is the universal API for all social data intelligence. A unified API pipeline offers secure, authenticated connections to 20+ social media and creator platforms. The largest creator economy and influencer marketing players trust only Phyllo to fetch profile details, monitor performance to calculate ROI, publish on behalf of others, create consolidated creator profiles/link in bio pages, and much more. After dominating the landscape of creator economy, we've stepped in to fix the broken parts of influencer marketing. Our fresh, AI powered APIs set new standards for social listening, evaluating influencer-brand fitment, and ensuring online brand safety. We also offer solutions for marketing agencies, and automated and intelligent social background checks for recruitment purposes. Phyllo is a data gateway that allows creator data to be accessed directly from source platforms. ‍ Phyllo builds the underlying infrastructure that connects with every creator platform, maintains a live data feed to the systems used by these platforms to manage creators’ data, and provides a normalised data set so that businesses can use creators’ data in a simple yet impactful way. **Average Rating:** 4.5/5.0 **Total Reviews:** 10 #### How Do G2 Users Rate Phyllo? - **Data Processing:** 8.8/10 (Category avg: 8.7/10) - **Ease of Use:** 9.2/10 (Category avg: 8.8/10) - **Integration Breadth:** 9.2/10 (Category avg: 9.0/10) - **Professional Support:** 9.2/10 (Category avg: 9.1/10) #### Who Is the Company Behind Phyllo? - **Seller:** [Phyllo](https://www.g2.com/sellers/phyllo) - **HQ Location:** Fremont, California - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=13eea4a28fcdf363f92529b3e0817c04e447ac94d53436a431a0c4f5741de2b8&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Finsightiq-ai%2F&secure%5Burl_type%5D=linkedin_company_website) 7 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 100% Small #### What Are Recent G2 Reviews of Phyllo? **["Streamlined Data Integration for Social Media Platforms"](https://www.g2.com/survey_responses/phyllo-review-9655464)** **Rating:** 5.0/5.0 stars _— Sarthak A._ [Read full review](https://www.g2.com/survey_responses/phyllo-review-9655464) **["Amazing support and communication!"](https://www.g2.com/survey_responses/phyllo-review-8312912)** **Rating:** 5.0/5.0 stars _— Alex Q._ [Read full review](https://www.g2.com/survey_responses/phyllo-review-8312912) ### [Revert](https://www.g2.com/products/revert-revert/reviews) Revert is a unified API for all your product integrations. With Revert, you would not need to integrate with multiple third-party APIs yourself and only integrate with Revert once. New third party integrations will automatically be added and can be turned on immediately. Your customers authenticate their tools with us using our drop-in UI that you can integrate in your front-end. **Average Rating:** 3.5/5.0 **Total Reviews:** 3 #### How Do G2 Users Rate Revert? - **Data Processing:** 8.3/10 (Category avg: 8.7/10) - **Ease of Use:** 7.8/10 (Category avg: 8.8/10) - **Integration Breadth:** 8.3/10 (Category avg: 9.0/10) - **Professional Support:** 9.2/10 (Category avg: 9.1/10) #### Who Is the Company Behind Revert? - **Seller:** [Revert](https://www.g2.com/sellers/revert) - **Year Founded:** 2022 - **HQ Location:** San Francisco, US - **Twitter:** @revertdotdev 239 Twitter followers - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=b75f6f82a5313fc411dca1652ffc1e8e21de1c13a3666683dff21e20156009d1&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Frevertinc&secure%5Burl_type%5D=linkedin_company_website) 5 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 100% Small #### What Are Recent G2 Reviews of Revert? **["Solving integration and scalability challenges in Software development"](https://www.g2.com/survey_responses/revert-review-9939596)** **Rating:** 4.5/5.0 stars _— Sunitha V._ [Read full review](https://www.g2.com/survey_responses/revert-review-9939596) ### [Merge Agent Handler](https://www.g2.com/products/merge-agent-handler/reviews) Merge Agent Handler lets you securely connect your agents to thousands of third-party tools,
while managing and monitoring all tool interactions **Average Rating:** 4.5/5.0 **Total Reviews:** 2 #### How Do G2 Users Rate Merge Agent Handler? - **Ease of Use:** 10.0/10 (Category avg: 8.8/10) - **Integration Breadth:** 10.0/10 (Category avg: 9.0/10) - **Professional Support:** 10.0/10 (Category avg: 9.1/10) #### Who Is the Company Behind Merge Agent Handler? - **Seller:** [Merge](https://www.g2.com/sellers/merge) - **Year Founded:** 2020 - **HQ Location:** San Francisco, US - **Twitter:** @merge\_api 3,254 Twitter followers - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=b8c8a1452840c830f1c090f6b81e4fb545794f2830c09fe6655dd108b396c4e8&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fmerge-api%2F&secure%5Burl_type%5D=linkedin_company_website) 138 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 50% Large, 50% Medium #### What Are Recent G2 Reviews of Merge Agent Handler? **["Seamless Integration with Stellar Support"](https://www.g2.com/survey_responses/merge-agent-handler-review-12556712)** **Rating:** 5.0/5.0 stars _— David D._ [Read full review](https://www.g2.com/survey_responses/merge-agent-handler-review-12556712) **["Responsive, Friendly Support That Builds Real Trust"](https://www.g2.com/survey_responses/merge-agent-handler-review-12584121)** **Rating:** 4.0/5.0 stars _— Verified User in Information Technology and Services_ [Read full review](https://www.g2.com/survey_responses/merge-agent-handler-review-12584121) ### [Precise API](https://www.g2.com/products/precise-api/reviews) The Precise API is a streamlined solution that connects and aggregates business accounting data for enterprise users, including financial institutions, lenders, and fintechs. Offers essential insights into the financial health of business clients, including historical, real-time, and forecasted performance. With features like pre-built cash flow forecasting tools, the Precise API makes it simple to retain small business clients. Predict as a Service is a powerful add-on available for the Precise API. Support business clients with a premium white-label cash flow forecasting and scenario planning portal and retain ongoing accounting data access for additional engagement. **Average Rating:** 4.8/5.0 **Total Reviews:** 2 #### How Do G2 Users Rate Precise API? - **Data Processing:** 9.2/10 (Category avg: 8.7/10) - **Ease of Use:** 9.2/10 (Category avg: 8.8/10) - **Integration Breadth:** 9.2/10 (Category avg: 9.0/10) - **Professional Support:** 10.0/10 (Category avg: 9.1/10) #### Who Is the Company Behind Precise API? - **Seller:** [Forwardly](https://www.g2.com/sellers/forwardly) - **Year Founded:** 2022 - **HQ Location:** Claymont, US - **Twitter:** @forwardlyapp 246 Twitter followers - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=d2ef87151d9391cc264ae7f0aab4a1357abef2748f3b6128d102aac97b26770e&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fforwardai%2F&secure%5Burl_type%5D=linkedin_company_website) 39 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 50% Large, 50% Small #### What Are Recent G2 Reviews of Precise API? **["Streamline Financial Data Access"](https://www.g2.com/survey_responses/precise-api-review-10684693)** **Rating:** 5.0/5.0 stars _— Pratik S._ [Read full review](https://www.g2.com/survey_responses/precise-api-review-10684693) **["Precise API"](https://www.g2.com/survey_responses/precise-api-review-9863976)** **Rating:** 4.5/5.0 stars _— Avan K._ [Read full review](https://www.g2.com/survey_responses/precise-api-review-9863976) ### [Boss Insights](https://www.g2.com/products/boss-insights/reviews) Boss Insights provides global leading access to business customers’ financial data with a single connection to accounting, banking, commerce, payroll, tax and more (i.e. Quickbooks, Stripe, SalesForce, etc.). It’s used by fintechs and neobanks to gain 51% faster funding, 5x faster renewals, 100% automated scoring and 60% cost savings. **Average Rating:** 4.5/5.0 **Total Reviews:** 5 #### How Do G2 Users Rate Boss Insights? - **Ease of Use:** 9.6/10 (Category avg: 8.8/10) #### Who Is the Company Behind Boss Insights? - **Seller:** [Boss Insights](https://www.g2.com/sellers/boss-insights) - **Year Founded:** 2017 - **HQ Location:** Toronto, CA - **Twitter:** @bossinsight 338 Twitter followers - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=18c320c1158666657ebdc0d2bc9963017e90712ee26c72903e7bbe50f0101743&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fbossinsights%2F&secure%5Burl_type%5D=linkedin_company_website) 7 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 60% Small, 40% Medium #### What Are Recent G2 Reviews of Boss Insights? **["Fast Access to Democratized Data"](https://www.g2.com/survey_responses/boss-insights-review-7139345)** **Rating:** 5.0/5.0 stars _— Michelle K._ [Read full review](https://www.g2.com/survey_responses/boss-insights-review-7139345) **["Access to ongoing SMB financial data monitoring"](https://www.g2.com/survey_responses/boss-insights-review-7946215)** **Rating:** 5.0/5.0 stars _— Verified User in Financial Services_ [Read full review](https://www.g2.com/survey_responses/boss-insights-review-7946215) ### [Duffel](https://www.g2.com/products/duffel/reviews) We’re rethinking travel from the ground up. Our platform helps bring new experiences to life so that traveling feels like a seamless part of your journey instead of a chore. **Average Rating:** 4.5/5.0 **Total Reviews:** 5 #### How Do G2 Users Rate Duffel? - **Ease of Use:** 8.8/10 (Category avg: 8.8/10) #### Who Is the Company Behind Duffel? - **Seller:** [Duffel](https://www.g2.com/sellers/duffel) - **Year Founded:** 2017 - **HQ Location:** London, GB - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=e2b14823bd13069d3f5a5d1675243339f687a05a2da64f09565394a2b996736a&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fduffelhq&secure%5Burl_type%5D=linkedin_company_website) 55 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 40% Medium, 40% Small #### What Are Recent G2 Reviews of Duffel? **["Flexible NDC Aggregator, Great Onboarding"](https://www.g2.com/survey_responses/duffel-review-12519920)** **Rating:** 4.5/5.0 stars _— Guillaume M._ [Read full review](https://www.g2.com/survey_responses/duffel-review-12519920) **["Automating the process of booking an international trip"](https://www.g2.com/survey_responses/duffel-review-9957067)** **Rating:** 4.5/5.0 stars _— Thimaporn P._ [Read full review](https://www.g2.com/survey_responses/duffel-review-9957067) ### [GTM API](https://www.g2.com/products/gtm-api/reviews) GTM API is ready-made GTM infrastructure. A single, typed API gives AI agents (Claude, ChatGPT, and others) and backend systems programmatic access to LinkedIn, email, and calendars. It is not just another sequencer; it is the execution layer for your pipeline: your agent sends invites and messages, manages the inbox, and streams events back into your stack. Connect three ways: MCP (Model Context Protocol) for AI agents, REST APIs for backends, and webhooks for event-driven workflows. Works with Claude, ChatGPT, LangChain, n8n, Make, Zapier, and custom stacks. Channels: LinkedIn, email (Gmail, Outlook, IMAP), and calendar sync (Google, Microsoft, iCal). Capabilities: • Messaging: direct messages, Sales Navigator messages, InMails • Connection requests and invitations • Post engagement: tracking, commenting, liking • Profile and company search with enrichment • Audience mining: likers and commenters Safety by design, the safest LinkedIn stack: Single Session Protection (one active session per account), cloud anti-detect browser infrastructure, rotating sender profiles, dedicated residential proxies, smart warm-up curves and rate limiting, and device fingerprinting. The result: 20,000+ LinkedIn accounts operated at under a 1% ban rate, versus an industry where roughly 80% of automation users get restricted in their first year. Built for: • GTM engineers connecting agents to outreach workflows • Agencies onboarding clients safely with OAuth, no password sharing • Platform builders embedding channels in their own product • Account providers managing and leasing account fleets with access controls and warm-up Example workflows: scrape post engagers, enrich, filter by role and company, export leads; triage unanswered messages and auto-draft replies; event-based outreach (SaaStr attendees, job changes); track competitor audiences and dedupe against your CRM; run multi-account mass actions with intelligent pacing; classify inbound replies and route hot leads to HubSpot. **Average Rating:** 5.0/5.0 **Total Reviews:** 1 #### How Do G2 Users Rate GTM API? - **Data Processing:** 10.0/10 (Category avg: 8.7/10) - **Ease of Use:** 10.0/10 (Category avg: 8.8/10) - **Integration Breadth:** 10.0/10 (Category avg: 9.0/10) - **Professional Support:** 10.0/10 (Category avg: 9.1/10) #### Who Is the Company Behind GTM API? - **Seller:** [GTM API](https://www.g2.com/sellers/gtm-api) - **HQ Location:** N/A - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=7886df2ed926834e5eb248c77dcfa8e5c815d3ab1f0fe3132ced0dba45868834&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2FNo-Linkedin-Presence-Added-Intentionally-By-DataOps&secure%5Burl_type%5D=linkedin_company_website) 1 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 100% Small #### What Are Recent G2 Reviews of GTM API? **["Really advanced LinkedIn API, fully automate my GTM with Claude"](https://www.g2.com/survey_responses/gtm-api-review-13186206)** **Rating:** 5.0/5.0 stars _— Michail S._ [Read full review](https://www.g2.com/survey_responses/gtm-api-review-13186206) ### [IntegrationOS](https://www.g2.com/products/integrationos/reviews) IntegrationOS is realtime integration middleware for high-growth startups. It gives developers and product teams an all-in-one toolkit to ship, manage and scale in-app integrations for customers. The catalog includes 50+ accounting, CRM, POS and commerce integrations. IntegrationOS is also fully open source under an OSI-approved license (GPL3). **Average Rating:** 4.8/5.0 **Total Reviews:** 3 #### How Do G2 Users Rate IntegrationOS? - **Ease of Use:** 8.9/10 (Category avg: 8.8/10) #### Who Is the Company Behind IntegrationOS? - **Seller:** [IntegrationOS](https://www.g2.com/sellers/integrationos) - **Year Founded:** 2021 - **HQ Location:** Toronto, CA - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=61185fc8b7ebfc7427048acc26e6fb7771b7884deb757fc52b3426e86a05316f&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fintegrationos%2F&secure%5Burl_type%5D=linkedin_company_website) 26 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 100% Small #### What Are Recent G2 Reviews of IntegrationOS? **["Simple to use, exceptional team to help"](https://www.g2.com/survey_responses/integrationos-review-9946767)** **Rating:** 5.0/5.0 stars _— Kanoj V._ [Read full review](https://www.g2.com/survey_responses/integrationos-review-9946767) **["IntegrationOS Review"](https://www.g2.com/survey_responses/integrationos-review-9963450)** **Rating:** 4.5/5.0 stars _— Brandon J._ [Read full review](https://www.g2.com/survey_responses/integrationos-review-9963450) ### [Merlin Unified API](https://www.g2.com/products/merlin-unified-api/reviews) Merlin Unified API integrates multiple AI models, including Gemini, GPT-4, and DALL-E, through a single API endpoint. **Average Rating:** 5.0/5.0 **Total Reviews:** 1 #### How Do G2 Users Rate Merlin Unified API? - **Data Processing:** 10.0/10 (Category avg: 8.7/10) - **Ease of Use:** 8.3/10 (Category avg: 8.8/10) - **Integration Breadth:** 10.0/10 (Category avg: 9.0/10) - **Professional Support:** 10.0/10 (Category avg: 9.1/10) #### Who Is the Company Behind Merlin Unified API? - **Seller:** [Foyer Tech](https://www.g2.com/sellers/foyer-tech) - **HQ Location:** N/A - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=7886df2ed926834e5eb248c77dcfa8e5c815d3ab1f0fe3132ced0dba45868834&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2FNo-Linkedin-Presence-Added-Intentionally-By-DataOps&secure%5Burl_type%5D=linkedin_company_website) 1 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 100% Small #### What Are Recent G2 Reviews of Merlin Unified API? **["I love merlin"](https://www.g2.com/survey_responses/merlin-unified-api-review-10568250)** **Rating:** 5.0/5.0 stars _— Ivana B._ [Read full review](https://www.g2.com/survey_responses/merlin-unified-api-review-10568250) ### [Pinwheel](https://www.g2.com/products/pinwheel/reviews) Pinwheel helps banks, CUs and fintechs win primacy by delivering frictionless digital experiences. Our industry leading Switch Kit, enabling instant deposit and bill switching at account opening, delivers 30% more switches than any competitive solution. Through our proprietary network covering 1,800 payroll providers, 1.5 million employers, and thousands of merchants, Pinwheel connects financial institutions to real-time, source of truth income, employment, deposits and payments data - so banks can deliver personalized services that help customers better manage their complete financial lives. Pinwheel is the provider of choice for some of the world's most innovative financial providers, including American Express, MoneyLion, Credit Karma and many more. Pinwheel has raised $77M from top-tier investors such as Notable, Coatue, First Round Capital, Upfront and more. **Average Rating:** 4.3/5.0 **Total Reviews:** 3 #### How Do G2 Users Rate Pinwheel? - **Data Processing:** 8.3/10 (Category avg: 8.7/10) - **Ease of Use:** 6.7/10 (Category avg: 8.8/10) - **Integration Breadth:** 6.7/10 (Category avg: 9.0/10) - **Professional Support:** 6.7/10 (Category avg: 9.1/10) #### Who Is the Company Behind Pinwheel? - **Seller:** [Pinwheel](https://www.g2.com/sellers/pinwheel) - **HQ Location:** New York, US - **Twitter:** @PinwheelAPI 640 Twitter followers - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=84fc9ecff87707b19baf5b8e28cb8cad0b47cf49001527a7af6b821e0fb2c2da&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fpinwheelhq%2F&secure%5Burl_type%5D=linkedin_company_website) 71 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 100% Small #### What Are Recent G2 Reviews of Pinwheel? **["Very detailed software for income data"](https://www.g2.com/survey_responses/pinwheel-review-7145111)** **Rating:** 5.0/5.0 stars _— Verified User in Information Technology and Services_ [Read full review](https://www.g2.com/survey_responses/pinwheel-review-7145111) **["Easy to set up with apps and customizable schedules for different times of the day"](https://www.g2.com/survey_responses/pinwheel-review-10658270)** **Rating:** 4.0/5.0 stars _— Ben G._ [Read full review](https://www.g2.com/survey_responses/pinwheel-review-10658270) ### [Railz](https://www.g2.com/products/railz/reviews) Railz is building the largest financial data network for the future of finance. We aim to bridge the connection between future-thinking financial institutions and companies and their SMB customers’ financial data. Our Accounting Data-as-a-Service™ solution offers financial institutions and fintechs the ability to move fast through messy data - and make sense of it all. With our single API, get the financial data you need from major accounting and financial service providers. Get real-time accounting data, syncing, and analysis at your fingertips with Railz. **Average Rating:** 3.9/5.0 **Total Reviews:** 9 #### How Do G2 Users Rate Railz? - **Data Processing:** 6.1/10 (Category avg: 8.7/10) - **Ease of Use:** 7.6/10 (Category avg: 8.8/10) - **Integration Breadth:** 5.6/10 (Category avg: 9.0/10) - **Professional Support:** 5.6/10 (Category avg: 9.1/10) #### Who Is the Company Behind Railz? - **Seller:** [Railz](https://www.g2.com/sellers/railz) - **Year Founded:** 2020 - **HQ Location:** Toronto, Ontario - **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=06592419e08d7889e0f54dab10aee8b2fad05ccfc5e006d0f5761c7daae335c7&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2F65396558&secure%5Burl_type%5D=linkedin_company_website) 8 employees on LinkedIn® #### Who Uses This Product? - **Company Size:** 44% Large, 44% Small #### What Are Recent G2 Reviews of Railz? **["Single API simplifies data retrieval and analysis"](https://www.g2.com/survey_responses/railz-review-10762043)** **Rating:** 4.0/5.0 stars _— Olubunmi O._ [Read full review](https://www.g2.com/survey_responses/railz-review-10762043) **["Useful API for many"](https://www.g2.com/survey_responses/railz-review-10781922)** **Rating:** 4.0/5.0 stars _— Verified User in Computer Software_ [Read full review](https://www.g2.com/survey_responses/railz-review-10781922) - [‹ Prev‹ Prev](/categories/unified-apis?order=g2_score&page=2#product-list) - [1](/categories/unified-apis?order=g2_score#product-list) - [2](/categories/unified-apis?order=g2_score&page=2#product-list) - 3 - [4](/categories/unified-apis?order=g2_score&page=4#product-list) - [5](/categories/unified-apis?order=g2_score&page=5#product-list) - [Next ›Next ›](/categories/unified-apis?order=g2_score&page=4#product-list) Spotlight Categories [Digital Signage Software](https://www.g2.com/categories/digital-signage) [Experience Management Software](https://www.g2.com/categories/experience-management) [Mobile Marketing Software](https://www.g2.com/categories/mobile-marketing) [Core HR Software](https://www.g2.com/categories/core-hr) [Employee Intranet Software](https://www.g2.com/categories/employee-intranet) Similar Categories - [Cloud Platform as a Service (PaaS)](/categories/cloud-platform-as-a-service-paas) - [Integrated Development Environments (IDE)](/categories/integrated-development-environments-ide) - [Software Testing](/categories/software-testing) - [Communication Platform as a Service (CPaaS)](/categories/communication-platform-as-a-service-cpaas) - [Help Authoring Tool (HAT)](/categories/help-authoring-tool-hat) - [Other Development](/categories/other-development) - [AI Documentation Generators](/categories/ai-documentation-generators) - [API Development](/categories/api-development) - [API Documentation Management](/categories/api-documentation-management) - [API Generation](/categories/api-generation) - [API Management](/categories/api-management) - [API Marketplace](/categories/api-marketplace) - [API Mocking](/categories/api-mocking) - [API Platforms](/categories/api-platforms) - [Application Development](/categories/application-development) [Browse Unified APIs Themes](/categories/unified-apis/themes) ![Adam Crivello](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Adam Crivello") AC Researched and written by [Adam Crivello](https://research.g2.com/insights/author/adam-crivello) Updated October 3, 2024 Unified APIs (application programming interfaces), also called universal or normalized APIs, provide a single “meta" API that is used to interact with multiple software applications within the same category. These tools act as an abstraction layer that handles communication with multiple applications by aggregating and standardizing their APIs and data models into a single API. SaaS providers use these tools to improve the ease of building customer-facing integrations to multiple applications in the same category, such as accounting, banking, cloud storage, CRM, email, HR, payroll, or scheduling systems. They can save teams significant time and resources when building numerous similar integrations. For example, a SaaS product team may want to provide their customers with integrations that import employee data from multiple HR systems into their application. Rather than building a separate integration to each HR system, they can build one integration to a unified HR API that connects their application with all desired HR applications. Leveraging a unified API provides a single, simplified API design and a consistent developer experience. There is some relationship between unified APIs and [embedded integration platforms](https://www.g2.com/categories/embedded-integration-platforms), as they allow product teams to build native integrations with their customers’ third-party applications. However, unified APIs are typically code focused and used by software developers to build straightforward integrations within a single category. In contrast, embedded integration platforms are typically low-code tools used by both developers and non-developers to build a broader range of integrations within both common and vertical-specific software categories. To qualify for inclusion in the Unified APIs category, a product must: - Allow users to build integrations between their application and customer-facing applications - Aggregate multiple APIs within the same software category into a single API - Provide a standardized data model and developer experience Show More