Voiden

What is Voiden?

Offline API client that keeps requests, tests and docs together in Markdown files in Git.

Who is Voiden best for?

Voiden is best for developers and API testers who want requests, tests and docs kept as Markdown files in their Git repo.

• API work reviewed in Git

  Requests, docs and notes live in plain Markdown .void files, so changes go through the same diffs and pull requests as code.

• Reusable request parts

  Endpoints, headers, auth and params are blocks you can reuse across files, much like functions.

• API tests in CI

  The @voiden/runner CLI runs the same files headless in GitHub Actions, GitLab CI or cron, with exit codes a pipeline can read.

• Requests as agent tools

  A tool block turns a saved request into an MCP tool that Claude Code, Codex or another agent can call through @voiden/mcp.

How much does Voiden cost?

Voiden is free: the desktop app is open source under Apache 2.0, with no paid plans and no seat price, for teams of any size.

Voiden has no paid plans or cloud service. Access control, audit trails and data residency come from your own Git hosting, so nothing reaches the maker. Full pricing on github.com. We checked these prices on 8 Nov 2026.

How do readers rate Voiden?

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Is Voiden open source?

Yes. Voiden's code is public under the Apache 2.0 licence, so you can run it on your own server.

What are the best Voiden alternatives?

Voiden is an open source alternative to Postman. Insomnia, Bruno, Hoppscotch and 2 more do the same job and are open source too.

PostmanFree

APIs developed, tested and managed on an AI-native platform.

InsomniaOpen Source

Desktop app to send, test, mock and document API requests, with local or Git storage.

BrunoOpen Source

API client that saves requests as plain-text files in your Git repo and works fully offline.

HoppscotchOpen Source

API client for REST, GraphQL, WebSocket and more that runs in the browser or on desktop.

ChaparOpen Source

Native desktop API client for REST, gRPC, GraphQL and WebSocket that keeps all data local.

ScalarOpen Source

Interactive API reference docs and an offline API client, both built from your OpenAPI file.

Questions about Voiden