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Best Unified APIs Software in 2026

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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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Knit API
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Top Tools at a Glance

Best for

Multi-domain unified integrations with stable scaling

User Review

"Excellent support"

Adrian B.
AB

Adrian B.

Enterprise (> 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
Knit API
Product Description

Knit is a robust integration solution designed to facilitate seamless connections with over 150 applications, including HRIS, CRM, accounting systems, ERPs, and more. The platform enables users to...

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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 Backend Setup and Consistent API Management"

IC

Ines C.

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 Review: My Experience and What Stood Out"

Ajeet Y.
AY

Ajeet Y.

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 highly value the exceptional customer support from Merge, enabling seamless integration and efficient problem resolution.

Users love the ease of use of Merge Unified, appreciating its streamlined integration and insightful customer support.

Users value the seamless integrations of Merge Unified, significantly reducing workload and development time while enhancing versatility.

Users face integration issues that complicate experience and hinder connectivity, frustrating their ability to use the platform.

Users find Merge Unified expensive, especially when considering integration issues and inadequate support for the price.

Users find poor documentation hinders their ability to effectively use Merge Unified's dashboards and API tools.

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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 love the ease of use of Knit API, appreciating its straightforward setup and seamless integration process.

Users praise the responsive and supportive customer service of Knit API, ensuring smooth integration and implementation.

Users appreciate the effortless integration process of Knit API, enabling quick and efficient connection management across systems.

Users find the poor documentation of Knit API complicates setup and understanding of important features.

Users find insufficient examples for advanced use cases frustrating, wishing for more guidance in the documentation.

Users often face integration issues with Knit API, particularly with SAP, Google Drive, and Notion applications.

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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 value the highly responsive and supportive customer support of StackOne, enhancing integration experiences efficiently.

Users value the easy integrations with StackOne, appreciating its intuitive interface and responsive support for seamless implementation.

Users value the seamless integration capabilities of StackOne, appreciating the support and efficiency in connecting multiple LMS platforms.

Users experience insufficient information about breaking changes and field mappings, complicating integration with StackOne.

Users note the limited integrations available in StackOne, affecting onboarding and experimentation with external systems.

Users note the missing features in StackOne, often needing more filtering options and field mappings for HRIS integration.

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Why buyers love it?
Pros and Cons

Users commend the responsive customer support of Apideck Unify, ensuring quick resolutions and excellent communication.

Users find Apideck Unify to be exceptionally easy to use, facilitating seamless integration with multiple third-party APIs.

Users praise the integration capabilities of Apideck Unify, allowing seamless connections across various HRIS systems efficiently.

Users face API limitations with selective support for connectors, impacting the overall functionality and integration experience.

Users face data limitations with Apideck Unify, impacting complex integrations and requiring careful API usage monitoring.

Users note that there are still missing features, particularly with certain endpoints and third-party APIs.

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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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