Voiden - Markdown-based, Open-source Alternative to Postman
❓OTHER
Voiden is an offline-first, git-native API tool built on Markdown - and it very intentionally didn’t start as “let’s build a better Postman”.
Over time, API tooling became heavyweight: cloud dependencies for local work, forced accounts, proprietary formats, and workflows that break the moment you’re offline. Testing a localhost API shouldn’t need an internet connection.
So we asked a simple question: What if an API tool respected how developers already work?
That led to a few core ideas: - Offline-first, no accounts, no telemetry - Git as the source of truth - Specs, tests, and docs living together in Markdown - Extensible via plugins (including gRPC and WSS support)
We opensourced Voiden because extensibility without openness just shifts the bottleneck.
If workflows should be transparent, the tool should be too.
Define, test, and document APIs like a developer, not a SaaS user. No accounts. No lock-in. No telemetry. Just Markdown, Git, hotkeys, and your damn specs. - VoidenHQ/voiden