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Sparrow

Sparrow is an AGPL-3.0 open-source API testing app and Postman alternative for testing, debugging and sharing APIs with collaboration features, available as desktop and web apps.

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Introduction

Sparrow describes itself as an API development buddy that helps you test, debug and distribute better APIs while collaborating with colleagues. Its site calls it a free, open-source API testing app and Postman alternative.

The monorepo contains desktop and web apps, which you can run locally after cloning and copying the example environment files. Sparrow has launched several times on Product Hunt between 2024 and 2025 and runs community hackathons.

The source code is at sparrowapp-dev/sparrow-app on GitHub under the AGPL-3.0 licence, with about 2,500 stars; the most recent commit was on 1 April 2026.

Launch and background: Sparrow’s Product Hunt page lists launches on 22 July 2024, 12 October 2024 and 31 July 2025.

Features

  1. API testing: Send and inspect requests.
  2. Collaboration: Share with colleagues.
  3. Desktop and web: Two clients.
  4. Self-buildable: Open monorepo.

Pros

  1. Free to use: Open source under the AGPL-3.0 licence, so the core tool costs nothing to use.
  2. Actively maintained: The repository had commits as recent as 1 April 2026.

Cons

  1. AGPL-3.0: Copyleft licence.
  2. Slower release cadence: Last release April 2026.
  1. Download the desktop app from sparrowapp.dev, or clone sparrowapp-dev/sparrow-app.
  2. Create a workspace and import your collection.
  3. Invite teammates to collaborate.

Resources:

Pricing

Sparrow is free and open source under the AGPL-3.0 licence.

  1. Teams seeking a free Postman alternative with collaboration.

Conclusion

Sparrow is a capable open-source API client.

Check its feature set against your Postman usage.

On CheckOps, Sparrow is filed under the API & contract testing and Integration testing stages. Related tools listed here include Postman, Hoppscotch, Bruno, Insomnia, Apidog and Yaak. Which one fits best depends mostly on your stack, your team’s size and skills, and whether you prefer to run tools yourself or pay for a managed service. This page reflects the official website, documentation and repository as they stood on 11 November 2026.

Alternatives

Other tools on CheckOps that cover similar ground. Open a page, or compare one with Sparrow side by side.