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Resonance

Local-first open-source API client with no account, storing collections as plain YAML files.

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About Resonance

Resonance is a desktop API client positioned as a lightweight, local-first alternative to Postman and Insomnia. There is no account, cloud sync or telemetry: collections, environments and history are plain YAML files on disk, so you can version and share them with Git. It covers REST, GraphQL (including subscriptions), gRPC with server reflection, WebSocket, Server-Sent Events and MQTT. It imports OpenAPI, Swagger, Postman, Insomnia, HAR and cURL, and includes a mock server, JavaScript pre-request and test scripts with a Postman-compatible API, a collection runner and a headless CLI for CI with JUnit reports. Secrets are kept in the operating system's keychain rather than in collection files. It is built with Tauri and Rust, MIT-licensed and free, and runs on Linux, macOS and Windows. As a young project it has a small community, and team collaboration happens through Git rather than shared workspaces.

Best for: Developers who want an offline, Git-friendly API client with no sign-in.

Pros and cons

What works

  • No account, cloud sync or telemetry
  • REST, GraphQL, gRPC, WebSocket, SSE and MQTT in one app
  • Imports Postman, Insomnia and OpenAPI collections
  • Headless CLI for running collections in CI

Why people leave

  • Young project with a small user base
  • No shared team workspaces beyond Git
  • Postman script compatibility is partial

Top Resonance alternatives

See all 5
  1. 1Yaak logo
    Yaak

    Fast local-first desktop client with gRPC and WebSocket support and a polished interface.

    79.8
  2. 2Bruno logo
    Bruno

    Also offline and Git-friendly, with a larger community and paid team editions.

    68.8
  3. 3Insomnia logo
    Insomnia

    Familiar desktop client with local vaults plus optional cloud sync for teams.

    59.4
  4. 4Postman logo
    Postman

    The full platform with team workspaces, monitors and API design, if cloud sync is fine.

    57.6
  5. 5Hoppscotch logo
    Hoppscotch

    Open-source web-first client you can self-host and use straight from the browser.

    57.5

Why people left Resonance

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Resonance: common questions

Is Resonance free?

Yes. Resonance is free, open-source software.

Is Resonance open source?

Yes. The source code is on GitHub at db-mobile/resonance.

What platforms does Resonance run on?

Resonance is available for Linux, macOS and Windows.

What are the best alternatives to Resonance?

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

See all 5 Resonance alternatives