# Top Free 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:** 4.61/5 (↑0.01 vs Jul 2026) The average rating of products in this category, based on all submitted ratings
- **Top Trending Product:** Plaid (+1.18%) - Among all products in this category, Plaid recorded the largest rating increase compared to last month

_Last updated: August 03, 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=2026-08-04T04%3A48%3A50Z&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%2Ffree%3Fpage%3D3&secure%5Btoken%5D=42e64c4c8fec33a6e1dffacadb5092a32a099e00b19b6beacc1514aba8a6fdb6&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)

### [Social Hook](https://www.g2.com/products/social-hook/reviews)

SocialHook is a Meta messaging webhook platform built exclusively for developers and technical agencies that need to receive Facebook, Instagram, and WhatsApp Business messages on their own server — without per-message fees, without per-conversation billing, and without being locked into a chatbot builder they do not control. It is not a no-code chatbot platform. It is not a shared inbox tool for support teams. It is pure webhook infrastructure — the layer between Meta's messaging APIs and your server. Every inbound message from any connected platform is normalised into a clean, signed JSON payload and delivered to your endpoint in under 50ms. You build on top. Your AI agent, your CRM sync, your n8n workflow, your Make.com automation — SocialHook fires the payload, you handle the logic.

#### Who Is the Company Behind Social Hook?

- **Seller:** [Lead Lock Systems](https://www.g2.com/sellers/lead-lock-systems)
- **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®

### [TartanHQ](https://www.g2.com/products/tartanhq/reviews)

Tartan is a Unified API infrastructure layer powered by AI Agentic Apps that helps organizations build new applications and power intelligent systems. By connecting data across fragmented systems and enabling AI-powered workflows, Tartan helps businesses verify identities, synchronize operations, and make real-time decisions all through one seamless and secure platform. Our core products are designed to reduce manual effort and deliver measurable cost savings. HyperSync integrates with 80+ HRIS, ERP, CRM and similar platforms to unify enterprise data and eliminate the need for complex, custom-built connectors. HyperApps empowers teams to rapidly deploy AI-driven workflows for compliance, customer onboarding, and process automation without heavy engineering lift. HyperVerify enables real-time verification of identity, employment, income, and business credentials, streamlining onboarding and reducing fraud.

**Average Rating:** 4.3/5.0

**Total Reviews:** 2

#### How Do G2 Users Rate TartanHQ?

- **Ease of Use:** 9.2/10 (Category avg: 8.8/10)

#### Who Is the Company Behind TartanHQ?

- **Seller:** [TartanHQ](https://www.g2.com/sellers/tartanhq)
- **Year Founded:** 2020
- **HQ Location:** Gurgaon, IN
- **Twitter:** @TartanHQ  
125 Twitter followers
- **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=0d1859af7479e2384d129afa817cd58afd833eb351d421325cad8e2cb888a61f&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Ftartanhq%2F&secure%5Burl_type%5D=linkedin_company_website)  
70 employees on LinkedIn®

#### Who Uses This Product?

- **Company Size:** 100% Small

#### What Are Recent G2 Reviews of TartanHQ?

**["Verification APIs"](https://www.g2.com/survey_responses/tartanhq-review-11454624)**

**Rating:** 4.0/5.0 stars

_— Harshita G._

[Read full review](https://www.g2.com/survey_responses/tartanhq-review-11454624)

**["Verification APIs simplified the process"](https://www.g2.com/survey_responses/tartanhq-review-11378437)**

**Rating:** 4.5/5.0 stars

_— Sulekha S._

[Read full review](https://www.g2.com/survey_responses/tartanhq-review-11378437)

### [Unified.cc by 500apps](https://www.g2.com/products/unified-cc-by-500apps/reviews)

Unified.cc is designed to allow developers to connect multiple APIs via a single API interface. By utilizing this platform, businesses can reduce the overall cost of API development and management. It assists teams with integration and other maintenance tasks. It offers a unified platform for all APIs, enabling developers to find and use the APIs they require. Businesses can use the API platform to connect with new customers and partners, as well as develop new products and services. Feature: - API Led Connectivity - Easy Deployment - Advanced Security - API Gateway - API Manager - Unlimited Projects Get access to 50 apps with Unified.cc for $14.99 per user

#### Who Is the Company Behind Unified.cc by 500apps?

- **Seller:** [500apps](https://www.g2.com/sellers/500apps)
- **Year Founded:** 2019
- **HQ Location:** New York, California
- **Twitter:** @SitePing500apps  
26 Twitter followers
- **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=cd894b90935a8dfb70360d37a67e7623dc9270e72cee1f7acd5c237c0def3ee3&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Foutreachly-by-500apps%2F&secure%5Burl_type%5D=linkedin_company_website)  
1 employees on LinkedIn®

### [World Data API](https://www.g2.com/products/world-data-api/reviews)

World Data API consolidates the reference data that developers typically pull from multiple separate APIs. Instead of integrating REST Countries for geography, TimezoneDB for timezones, Calendarific for holidays, and separate sources for airports and astronomy - you get one API with one authentication scheme, one response format, and interconnected data. Query an airport and get its timezone. Query a country and get its neighbors, currencies, and upcoming holidays. The relationships are built in and structured. Coverage includes 250+ countries with 5000+ regions, 316 IANA timezones, holidays for 230+ countries with regional breakdowns, 10,000+ airports, currencies, languages, and astronomy calculations (sunrise/sunset, golden hour, moon phases). Free tier available with 60 requests/day, and paid plans include more usage at a lower cost than competitors.

#### Who Is the Company Behind World Data API?

- **Seller:** [World Data API](https://www.g2.com/sellers/world-data-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®

### [Yapily](https://www.g2.com/products/yapily/reviews)

Yapily is Europe’s leading open banking infrastructure platform solving a fundamental problem in financial services today: access. We securely connect our customers to thousands of banks across Europe, allowing them to access financial data and initiate payments. Yapily’s customers range from disruptive fintechs to industry leaders operating in a number of verticals. To date, we've raised $69.4 million in funding, and employ over 200 people worldwide as we continue to scale across Europe.

**Average Rating:** 4.2/5.0

**Total Reviews:** 3

#### How Do G2 Users Rate Yapily?

- **Ease of Use:** 10.0/10 (Category avg: 8.8/10)

#### Who Is the Company Behind Yapily?

- **Seller:** [Yapily](https://www.g2.com/sellers/yapily)
- **Year Founded:** 2017
- **HQ Location:** London, GB
- **Twitter:** @YapilyLtd  
914 Twitter followers
- **LinkedIn® Page:** [www.linkedin.com](https://www.g2.com/external_clickthroughs/record?secure%5Bsource_type%5D=product_profile&secure%5Btoken%5D=6742e2f717ab561929ddf2e19067d7c8dff46a417e7f8c8698f0f20b037961e1&secure%5Burl%5D=https%3A%2F%2Fwww.linkedin.com%2Fcompany%2Fyapily%2F&secure%5Burl_type%5D=linkedin_company_website)  
125 employees on LinkedIn®

#### Who Uses This Product?

- **Company Size:** 67% Medium, 33% Large

#### What Are Recent G2 Reviews of Yapily?

**["The best API and customer support"](https://www.g2.com/survey_responses/yapily-review-7831413)**

**Rating:** 5.0/5.0 stars

_— Shubham A._

[Read full review](https://www.g2.com/survey_responses/yapily-review-7831413)

**["Making connect to banks easier with it's robust API"](https://www.g2.com/survey_responses/yapily-review-7109399)**

**Rating:** 5.0/5.0 stars

_— Verified User in Financial Services_

[Read full review](https://www.g2.com/survey_responses/yapily-review-7109399)

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