Hey there,
A few months ago we open sourced Voiden, an offline API client we originally built to replace Postman internally. Voiden now has 12k+ downloads, 1k+ GitHub stars, and is growing every day. ❤️
Core principles we built it on:
- free and local-first
- file-based, all plain executable markdown
- composable through blocks
- collaboration in Git, where devs are already working
The main thing is that in Voiden, API requests are not static forms. They are built from blocks: endpoint, auth, params, body, scripts, and more. These blocks can be used, reused, replaced, and versioned in Git, just like code. And all of it lives in plain executable text.
Our inspiration was curl, because of how simple it is, and Obsidian, because of how powerful file-based workflows can become.
Who this is for:
- Developers, QA engineers, and technical writers working and collaborating on APIs.
Since open sourcing, almost everything we shipped came from actual users, feedback, and contributions that pushed the tool in a few interesting directions.
You can check our changelog here: https://voiden.md/changelog
A few highlights:
- Composable API workflows: reusable .void files that can be combined into flows
- Multiple requests in sequence
- Real scripting with JS, Python, and Shell before and after requests
- A skills layer so tools like Claude/Codex can operate directly on .void files and request blocks
- An SDK for community plugins
- And more…
This project is now mostly shaped and driven by community ideas and contributions. You’re welcome to join and help us make it even better.
There is no account setup. It’s free and totally offline.
GitHub: https://github.com/VoidenHQ/voiden
Download: https://voiden.md/download
Awesome - would love some feedback !