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Best Unified APIs Software in 2025

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1,600+
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Multi-domain unified integrations with stable scaling

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Merge Unified

Unified HRIS + payroll integrations

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Finch

European HRIS normalization and compliance-aligned integrations

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Kombo

Featured Unified APIs Software At A Glance

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Top Tools at a Glance

Best for

Multi-domain unified integrations with stable scaling

User Review

"Simple and Intuitive Platform That Streamlines Navigation"

Verified User
U

Verified User

Mid-Market (51-1000 emp.)

Best for

Unified HRIS + payroll integrations

User Review

"Outstanding Client Service Sets Finch Apart"

Jean S.
JS

Jean S.

Small-Business (50 or fewer emp.)

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Sponsored
Unified.to
Product Description

350+ integrations across 21 Unified APIs — Unified is the real-time unified API + MCP platform for AI-powered SaaS applications. One customer integration request can take a software team months...

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Best for

European HRIS normalization and compliance-aligned integrations

User Review

"Amazing breadth and depth across HRIS providers. Extremely responsive and supportive team"

Wes K.
WK

Wes K.

Small-Business (50 or fewer emp.)

Best for

Stable HR + payroll data connectivity

User Review

"Effortless Real-Time Integrations Without Custom Development"

NJ

Nell J.

Small-Business (50 or fewer emp.)

Best for

Customizable unified API workflows

User Review

"One of the best Integration platforms"

Ankit B.
AB

Ankit B.

Small-Business (50 or fewer emp.)

Best for

Expanding integration catalogs without added engineering overhead

User Review

"Unified API and responsive support unlock integration potential"

Elpidiusz W.
EW

Elpidiusz W.

Enterprise (> 1000 emp.)

Best for

Large-scale unified integration coverage across categories

User Review

"A tremendous timesaver and value provider to the end user"

Jean-Marc L.
JL

Jean-Marc L.

Small-Business (50 or fewer emp.)

Best for

Automotive data access and mobility integrations

User Review

"Seamless Vehicle API Integration"

Cristian C.
CC

Cristian C.

Small-Business (50 or fewer emp.)

Best for

Developer-centric integration automation

User Review

"Nango Streamlines Integrations and Boosts Efficiency"

GK

Gaurav K.

Mid-Market (51-1000 emp.)

Best for

Standardized access to accounting and financial data via a single API

User Review

"We have partnered with Codat for nearly 4 years and they have always been helpful and knowledgeable"

Verified User
E

Verified User

Small-Business (50 or fewer emp.)


Multi-domain unified integrations with stable scaling

Unified HRIS + payroll integrations

European HRIS normalization and compliance-aligned integrations

Stable HR + payroll data connectivity

Customizable unified API workflows

Expanding integration catalogs without added engineering overhead

Large-scale unified integration coverage across categories

Automotive data access and mobility integrations

Developer-centric integration automation

Standardized access to accounting and financial data via a single API

Buyer's Guide: Unified APIs

All Unified APIs Tools

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58 Listings in Unified APIs Available
Why buyers love it?
Pros and Cons

Users highlight the exceptional customer support from Merge, enabling seamless integration and prompt assistance for various tasks.

Users appreciate the ease of use of Merge Unified, making integration and processes streamlined and efficient.

Users love the seamless integrations of Merge Unified, drastically reducing workload and saving development time.

Users face integration issues with Merge Unified, impacting system connections and resulting in unresponsive support experiences.

Users find Merge Unified to be expensive, especially with additional costs for essential features and support challenges.

Users find the poor documentation challenging, lacking detail and ease of access for effective troubleshooting.

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Why buyers love it?

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G2 recognized Kombo
Why buyers love it?
Why buyers love it?
Pros and Cons

Users appreciate the ease of use of Knit API, highlighting its straightforward setup and efficient integration management.

Users praise the responsive customer support of Knit API, ensuring smooth integration and detailed guidance throughout.

Users praise the effortless integration process of Knit API, saving time and simplifying management of connections.

Users find the documentation lacking, making setup and troubleshooting with Knit API unnecessarily challenging.

Users desire more examples for advanced use cases with Knit API to enhance their understanding and application.

Users report integration issues with SAP and struggle connecting to tools like Drive and Notion.

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Why buyers love it?
Pros and Cons

Users appreciate the ease of use of Refold, simplifying integration tasks and enhancing overall workflow efficiency.

Users appreciate the seamless integration capabilities of Refold, which streamline workflows and ensure data accuracy.

Users laud the exceptional customer support from Cobalt, making onboarding and app releases effortless and efficient.

Users experience a noticeable learning curve at first, but find eventual ease and effectiveness in using the platform.

Users find integration issues with the Shopify app time-consuming, limiting some functionalities and making complex scenarios challenging.

Users desire more comprehensive documentation to enhance the setup experience and improve discoverability of features.

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Why buyers love it?
Pros and Cons

Users commend the responsive and knowledgeable customer support of StackOne, enhancing the integration experience significantly.

Users appreciate the easy integrations with StackOne, highlighting excellent support and user-friendly API documentation.

Users value the smoother integration capabilities of StackOne, enhancing efficiency and data access across platforms.

Users report insufficient information regarding breaking changes and field mappings, complicating integration with HRIS backends.

Users highlight the limited integrations with a need for sandbox accounts and more supported systems for smoother onboarding.

Users face missing features in StackOne, particularly with field mapping and filtering options, impacting usability.

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Why buyers love it?
Pros and Cons

Users commend the responsive customer support of Apideck Unify, appreciating quick resolutions and effective communication.

Users find Apideck Unify incredibly easy to use, simplifying API integrations with a single unified approach.

Users value the unified API layer of Apideck Unify, drastically simplifying multi-platform HRIS integrations and saving time.

Users face API limitations with selective support and incomplete functionality across different connectors, impacting development efforts.

Users face data limitations with Apideck Unify, impacting integration flexibility and requiring careful API usage management.

Users note that some features are missing, particularly for certain endpoints, though the team is responsive and improving.

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Why buyers love it?
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Why buyers love it?
Pros and Cons

Users appreciate Nango's integration capabilities, enabling seamless connectivity and simplifying API management effortlessly.

Users value the easy integrations Nango provides, enhancing their productivity with seamless API connectivity and support.

Users praise Nango for its ease of use, highlighting intuitive setup and comprehensive documentation for smooth integration.

Users face API limitations requiring improvements, especially regarding throttle controls and compatibility with various API versions.

Users find Nango to be expensive for larger teams and multiple projects, affecting overall accessibility and usability.

Users find Nango's poor documentation limiting, suggesting enhancements like practical examples and step-by-step guides.

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Why buyers love it?
Why buyers love it?
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Pros and Cons

Users find Alloy Automation incredibly easy to use, simplifying workflow definition and integration with a drag-and-drop interface.

Users praise the exceptional customer support from Alloy Automation, providing quick assistance for integration challenges.

Users love the easy integrations with Shopify and various tools, streamlining their workflow effortlessly.

Users find the difficult setup process of Alloy Automation somewhat time-consuming despite helpful support from the team.

Users experience a challenging learning curve with Alloy Automation, impacting initial integration and workflow efficiency.

Users note the missing features in Alloy Automation, longing for enhancements in the admin dashboard and testing capabilities.

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Pros and Cons

Users appreciate the seamless integrations Rutter offers, simplifying processes and enhancing data management across platforms.

Users highlight the ease of use of Rutter, praising its intuitive setup and comprehensive support.

Users commend Rutter for its responsive customer support, ensuring quick resolutions and a seamless integration experience.

Users find the limited integration capabilities of Rutter challenging, especially for unique or lesser-known platforms.

Users find Rutter's pricing to be expensive for startups and solo developers, seeking more affordable options.

Users find the difficult setup of Rutter challenging, especially if they lack technical expertise for initial configuration.

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Why You Can Trust G2's Software Rankings

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