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Cartero

Native, open-source HTTP client for testing APIs without an account.

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About Cartero

Cartero is a desktop HTTP client for sending requests and testing web APIs, written in Rust with the GTK toolkit rather than as a web or Electron app. You build requests with any method, headers and a body, bind variables for API keys and other secrets, and inspect the responses. It works with REST, SOAP and XML-RPC services. Requests are stored as plain TOML files, so a team can keep them in Git next to the code instead of syncing through a vendor's cloud. It needs no account, has no cloud subscription and deliberately includes no AI features. Cartero is free software under the GPL, maintained by Dani Rodríguez in Spain, with builds for Linux (AppImage, Flathub, Snap), Windows 10 and later, and macOS 11 and later. It is younger and leaner than Postman, so collections, scripting and test runners are limited.

Best for: Developers who want a light, account-free API client whose requests live in Git.

Pros and cons

What works

  • No account, cloud subscription or AI features
  • Requests saved as Git-friendly plain TOML files
  • Native GTK app that starts fast and uses little memory
  • Builds for Linux, Windows and macOS

Why people leave

  • No GraphQL, gRPC or WebSocket support mentioned in its docs
  • No scripting or automated test runner like Postman's
  • Windows builds may still show signature warnings

Top Cartero alternatives

See all 6
  1. 1Yaak logo
    Yaak

    Another lightweight desktop client that keeps data local and supports more protocols.

    72.5
  2. 2Bruno logo
    Bruno

    Also stores collections as plain files in Git, with scripting and tests on top.

    68.8
  3. 3Insomnia logo
    Insomnia

    Adds GraphQL, gRPC and WebSockets, with optional local-only storage.

    61.8
  4. 4Postman logo
    Postman

    The full-featured standard, with collections, test runners and team workspaces.

    60.6
  5. 5HTTPie logo
    HTTPie

    Friendly command-line and desktop client for quick requests from the terminal.

    55.9

Why people left Cartero

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Cartero: common questions

Is Cartero free?

Yes. Cartero is free, open-source software.

Is Cartero open source?

No, Cartero is not open source. Open-source alternatives include Yaak, Bruno and Insomnia.

What platforms does Cartero run on?

Cartero is available for Linux, Windows and macOS.

What are the best alternatives to Cartero?

The highest-ranked Cartero alternatives right now are Yaak, Bruno and Insomnia. See the full ranked list for pricing, platforms and verified facts.

See all 6 Cartero alternatives