Best API Clients for Microsoft 365

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Compare the Top API Clients that integrate with Microsoft 365 as of July 2026

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This a list of API Clients that integrate with Microsoft 365. Use the filters on the left to add additional filters for products that have integrations with Microsoft 365. View the products that work with Microsoft 365 in the table below.

What are API Clients for Microsoft 365?

API clients are software tools or libraries that enable applications to communicate with APIs (Application Programming Interfaces) by sending requests and handling responses. They simplify the process of making authenticated calls, formatting requests, and parsing data returned from remote services. API clients often include features for error handling, retries, and rate-limiting to ensure reliable integrations. Many are available in multiple programming languages, making it easier for developers to interact with web services and backend systems. By abstracting the complexity of direct network communication, API clients accelerate development and help maintain clean, maintainable code. Compare and read user reviews of the best API Clients for Microsoft 365 currently available using the table below. This list is updated regularly.

  • 1
    Testfully

    Testfully

    Testfully

    From powerful API client features to advanced testing and monitoring, Testfully does it all. Enjoy the flexibility of cloud and offline-only storage, seamless team collaboration, and easy migration, all in one multi-platform tool. Easily transfer your data from Postman or Insomnia directly into Testfully. Flexible and secure, set global, environment, and folder variables scoped to workspace or user. Customize auth, parameters, headers, and body to build any HTTP request easily. Work together effortlessly, add teams, assign roles, and control folder access. Supports major schemes like OAuth2 for secure and streamlined authorization. From basic to complex, Testfully enables quick, effective testing without the need for coding, making advanced API testing accessible and hassle-free. Execute all requests in a folder simultaneously, sequentially, or randomly with just one click. Validate responses and perform contract testing using a declarative format, no coding is needed.
    Starting Price: $49 per month
    View Software
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