What is Voiden used for?

Voiden is an offline, Git-native API workspace that designs, tests, and documents APIs in plain-text Markdown files with reusable blocks and an agent-friendly CLI. It is a good fit for API collections reviewed through pull requests, and combining API tests and documentation in one place.

Is Voiden open source?

Yes. Voiden is open source under the Apache-2.0 licence. Its source code is on GitHub at VoidenHQ/voiden and is written mainly in TypeScript.

Yes. Voiden is open source, so the software itself is free to use.

What is Voiden an alternative to?

Voiden is an open-source alternative to Postman, Apidog, Apifox and SwaggerHub. Other open-source alternatives to Postman include Insomnia, Hoppscotch and Bruno.

Is Voiden actively maintained?

Yes. The most recent commit to Voiden was on 1 October 2026, and the latest release is v2.3.1-b, published on 1 October 2026. The project has 1.9k stars on GitHub.

Voiden: open-source alternative to Postman, Apidog, Apifox

About Voiden

Voiden is an offline API client for developers, QA engineers, and technical writers to build, test, collaborate on, and document APIs in one place. APIs are described in plain-text .void files that you keep in Git, with no account and no required cloud sync. It is built with Electron and TypeScript and released under the Apache-2.0 license.

Requests are composed from reusable API blocks that can be replaced and versioned like code, with a slash-command interface and a command-line tool designed to work with AI agents. It supports REST, GraphQL, gRPC, and WebSocket protocols, imports OpenAPI, and topics mention an MCP client. The project says it has no telemetry, no venture funding, and no cloud lock-in.

Voiden is positioned as an alternative to Postman, Bruno, and Insomnia. It suits teams who want their API collections and documentation to live in the repository as files that can be reviewed and shared through normal Git workflows.

Key features

Plain-text .void files stored in Git
Reusable API blocks
REST, GraphQL, gRPC, and WebSocket support
Agent-friendly command-line interface
OpenAPI support
No account or telemetry

Good fit for

→API collections reviewed through pull requests
→Combining API tests and documentation in one place

Built with: TypeScript; GraphQL
Tags: api-client; api-documentation; git-native; offline-first; markdown; postman-alternative; graphql; mcp

Voiden: questions and answers

What is Voiden used for?: Voiden is an offline, Git-native API workspace that designs, tests, and documents APIs in plain-text Markdown files with reusable blocks and an agent-friendly CLI. It is a good fit for API collections reviewed through pull requests, and combining API tests and documentation in one place.
Is Voiden open source?: Yes. Voiden is open source under the Apache-2.0 licence. Its source code is on GitHub at VoidenHQ/voiden and is written mainly in TypeScript.
Is Voiden free?: Yes. Voiden is open source, so the software itself is free to use.
What is Voiden an alternative to?: Voiden is an open-source alternative to Postman, Apidog, Apifox and SwaggerHub. Other open-source alternatives to Postman include Insomnia, Hoppscotch and Bruno.
Is Voiden actively maintained?: Yes. The most recent commit to Voiden was on 1 October 2026, and the latest release is v2.3.1-b, published on 1 October 2026. The project has 1.9k stars on GitHub.