
Postman
Insomnia REST
Bruno
Thunder Client
Postman for Mac (Beta)
Hoppscotch
curlx
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When comparing Run in Postman Button and Diffee, you can also consider the following products.

The Collaboration Platform for API Development
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Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a dev‑friendly UI, built-in automation, and an extensible plugin ecosystem.
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Bruno is a Git-integrated, fully offline, and open-source API client
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Rest API client for VS Code, lightweight Postman alternative
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Build, test, and document your APIs faster
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Open source API development ecosystem
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