Best Unified APIs Software - Page 3

How Many Unified APIs Software Products Does G2 Track?

Total Products under this Category: 81

Category Stats (Sep 2026)

  • Average Rating: 4.62/5 The average rating of products in this category, based on all submitted ratings
  • Top Trending Product: Bindbee (+1.43%) - Among all products in this category, Bindbee recorded the largest rating increase compared to last month

Last updated: September 15, 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
  • 81+ 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

Highlighted products: Merge Unified, Finch, Knit API, Kombo, Apideck Unify, Bindbee, Nango, and Smartcar.

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=bindbee&focus%5B%5D=nango&focus%5B%5D=smartcar)

Fastn

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
  • Year Founded: 2023
  • HQ Location: Austin, US
  • LinkedIn® Page: www.linkedin.com
    24 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 83% Small, 17% Medium

What Are Recent G2 Reviews of Fastn?

NexHealth

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: 130

How Do G2 Users Rate NexHealth?

  • Data Processing: 10.0/10 (Category avg: 8.7/10)
  • Ease of Use: 9.6/10 (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: NexHealth
  • Company Website:
  • Year Founded: 2017
  • HQ Location: San Francisco, California
  • Twitter: @nexhealthHQ
    2,139 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    189 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 find NexHealth to be easy to use and navigate, enhancing patient communication and revenue management efficiency.
  • Users praise the excellent customer support of NexHealth, always ready to assist with any queries or issues.
  • Users laud the responsive communication from NexHealth, enhancing efficiency and success in dental practice operations.
  • Users love the convenience of online forms, enabling easy patient communication and efficient management in the office.
  • Users find the ease of communication with patients through NexHealth to be extremely beneficial for their practices.
Cons
  • Users face messaging issues with NexHealth, finding it complicated and inconvenient for communication tasks.
  • Users often face technical issues like lagging and syncing, impacting the efficiency of patient check-outs.
  • Users find limited features in NexHealth, leading to inconvenience and the need for multiple work-arounds.
  • Users find the appointment management process cumbersome, requiring multiple steps and work-arounds for effective use.
  • Users experience calendar syncing issues, leading to missing information and occasional technical glitches during use.

What Are Recent G2 Reviews of NexHealth?

What Are G2 Users Discussing About NexHealth?

Sent

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
  • Year Founded: 2024
  • HQ Location: New York, US
  • LinkedIn® Page: www.linkedin.com
    47 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of Sent?

Phyllo

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
  • Year Founded: 2021
  • HQ Location: Fremont, US
  • LinkedIn® Page: www.linkedin.com
    61 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of Phyllo?

Revert

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
  • Year Founded: 2022
  • HQ Location: San Francisco, US
  • Twitter: @revertdotdev
    239 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    5 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of Revert?

Merge Agent Handler

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
  • Year Founded: 2020
  • HQ Location: San Francisco, US
  • Twitter: @merge_api
    3,254 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    159 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 50% Large, 50% Medium

What Are Recent G2 Reviews of Merge Agent Handler?

Precise API

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
  • Year Founded: 2022
  • HQ Location: Claymont, US
  • Twitter: @forwardlyapp
    246 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    39 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 50% Large, 50% Small

What Are Recent G2 Reviews of Precise API?

Boss Insights

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
  • Year Founded: 2017
  • HQ Location: Toronto, CA
  • Twitter: @bossinsight
    338 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    7 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 60% Small, 40% Medium

What Are Recent G2 Reviews of Boss Insights?

Duffel

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
  • Year Founded: 2017
  • HQ Location: London, GB
  • LinkedIn® Page: www.linkedin.com
    66 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 40% Medium, 40% Small

What Are Recent G2 Reviews of Duffel?

GTM API

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?

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of GTM API?

IntegrationOS

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?

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of IntegrationOS?

Merlin Unified API

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?

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of Merlin Unified API?

Pinwheel

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
  • HQ Location: New York, US
  • Twitter: @PinwheelAPI
    640 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    76 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of Pinwheel?

Railz

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
  • Year Founded: 2020
  • HQ Location: Toronto, Ontario
  • LinkedIn® Page: www.linkedin.com
    7 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 44% Small, 44% Large

What Are Recent G2 Reviews of Railz?

Sociavault

What is SociaVault? SociaVault is a social media data API that lets developers, marketers, and businesses extract public data from 25+ social platforms — including TikTok, Instagram, YouTube, X (Twitter), LinkedIn, and more — through a single, unified REST API. The Problem We Solve Building social media integrations is painful. Official APIs are restrictive, rate-limited, and require lengthy approval processes. Scraping in-house means maintaining fragile scripts that break every time platforms update. Teams waste months on infrastructure instead of building products. SociaVault eliminates this complexity. One API key. One documentation. Access to every major social platform. How It Works SociaVault provides simple REST endpoints to extract: - Profile data — Follower counts, bios, profile pictures, verification status - Posts and videos — Captions, hashtags, likes, comments, views, shares - Comments and replies — Full comment threads with engagement metrics - Search results — Find users, hashtags, or content by keyword - Trending content — Discover viral posts and emerging creators Data is returned in clean JSON format, ready for your application, dashboard, or analytics pipeline. Key Features No Rate Limits Pull data as fast as you need. Our auto-scaling infrastructure handles the load so you don't have to throttle requests. Real-Time Data Every API call returns fresh data directly from the source. No stale caches or outdated metrics. 25+ Platforms Supported TikTok, Instagram, YouTube, X/Twitter, LinkedIn, Facebook, Pinterest, Threads, Snapchat, Twitch, Reddit, and more — all through one integration. Simple Pricing Pay per successful API call. No monthly minimums, no hidden fees, no enterprise sales calls required. 99.9% Uptime Enterprise-grade reliability with redundant infrastructure and 24/7 monitoring. Who Uses SociaVault? - Marketing agencies tracking campaign performance across platforms - Influencer platforms analyzing creator metrics and audience demographics - Brand intelligence teams monitoring competitors and market trends - Developers building social media tools, dashboards, and integrations - Research teams studying social media trends and engagement patterns Why Teams Choose SociaVault - Access public data without lengthy approval processes or restrictive official APIs - Managed infrastructure that just works — no more broken scrapers after platform updates - One API integration covers 25+ social media platforms - No rate limits or throttling — pull data at the scale you need - Simple pay-per-call pricing with no monthly minimums or hidden fees Security & Compliance SociaVault only accesses publicly available data — the same information visible to any user browsing a profile. We don't access private accounts, direct messages, or data requiring authentication. Our infrastructure is SOC 2 compliant with enterprise-grade security controls. Product Description Company Background SociaVault is built by Ziddec, Inc., a software company focused on making social media data accessible to developers and businesses. Founded in 2024 and headquartered in Delaware, USA, we started as a small team frustrated by the complexity of extracting social media data for our own projects. What began as an internal tool evolved into a full API platform serving hundreds of customers worldwide — from solo developers to enterprise marketing teams.

Average Rating: 5.0/5.0

Total Reviews: 1

How Do G2 Users Rate Sociavault?

  • Ease of Use: 8.3/10 (Category avg: 8.8/10)
  • Professional Support: 10.0/10 (Category avg: 9.1/10)

Who Is the Company Behind Sociavault?

  • Seller: Ziddec
  • Year Founded: 2025
  • HQ Location: Wilmington, US
  • LinkedIn® Page: www.linkedin.com
    1 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of Sociavault?

Adam Crivello
AC
Researched and written by Adam Crivello
Updated October 3, 2024