Desktop app
The VernaOne desktop app is the free “Postman for AI” — a local workbench to author, run, and compare prompts across many models side by side with your own provider API keys. Nothing leaves your machine except the calls you make to the providers you configure.
Current version: 1.0.6. The app auto-updates in the background.
Download
| Platform | Requirement | File |
|---|---|---|
| macOS | Apple Silicon (M1–M4) | PromptLab-Desktop.dmg |
| Windows | Windows 10 / 11 · 64-bit | PromptLab-Desktop-Setup.exe |
You can also grab the right build automatically from the Download page (it detects your OS).
There is no maintained Linux build today. On Linux, use the web app instead.
What you can do
- Bring your own keys. Connect OpenAI, Anthropic, Google, and more with your own API keys, stored locally.
- Run one prompt across many models in parallel and compare output, latency, and cost.
- Iterate quickly with prompt parameters, output templates, and per-model settings.
From the desktop to production
The desktop app is for hands-on testing. When you’re ready to run a prompt in production — as a versioned, model-agnostic endpoint with fallback and analytics — move it into a VernaOne project and call it from the SDK or the HTTP API.