Postman
Go faster from development to production with higher accuracy and fewer tokens.
Postman is commercial API client software made by Postman, Inc. Its English Wikipedia article has about 1k readers a month on phones.
- Made by
- Postman, Inc.
- Wikipedia readers on phones
- 1k a month
- Source code
- Closed
Judgement
- What it is
- Developer tool
- What it does
- An API client and platform for sending requests, organising collections, writing tests, mocking and documenting APIs.
- Adopt it when
- A team wants shared API collections, tests and documentation in one widely known tool.
- Watch out
- It pushes cloud sync and accounts, collaboration needs paid plans, and the app has grown heavy.
- Ready for
- Production-ready
- Runs as
- Desktop app, cloud service and command line
- Built with
- Electron
- What the license allows
- Closed source: you use it under the maker's terms and cannot change or resell the code.
Judged on 2026-11-03 from the maker's description and Wikipedia. The license and age lines are worked out directly.
Open-source alternatives to Postman
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1
Hoppscotch hoppscotch
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2
Bruno usebruno
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
Developer tool Production-ready You want Postman-style testing without cloud sync, keeping collections in your repository.
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3
Insomnia Kong
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.
Developer tool Production-ready You need an API client with API design features and work in the Kong ecosystem.
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4
Yaak mountain-loop
The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬
Developer tool Production-ready You want a fast, local Postman alternative without an account.
★ 19k MIT TypeScript Active, pushed yesterday -
5
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6
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A RWKV management and startup tool, full automation, only 8MB. And provides an interface compatible with the OpenAI API. RWKV is a large language model that is fully open source and available for commercial use.
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7
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8
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👨🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode, PayPal, AWS, Autodesk, and many more.
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9
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10
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A simple API client (postman like) in your terminal
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Under it
Every program, Postman included, runs on a microchip.
The description is the maker's own, quoted as written. Facts come from Wikipedia and refresh weekly. Readers are counted on Wikipedia's mobile site only, because automated traffic that Wikimedia does not flag inflates desktop counts.