Arcana

A prompt workbench for your desktop.

Save and version your prompts, run one prompt side by side on Claude, GPT, Gemini and local Ollama models, and evaluate it over a whole dataset. Bring your own API keys: they stay on your computer.

A library with folders, tags, favorites, typo-tolerant search and real version diffs
Streaming side-by-side runs with token counts and cost estimates
Batch runs, ratings and version comparison (Arcana Pro)
Sync between your computers and public share links (Arcana Pro)

Download for Windows Linux AppImage .deb .rpm

The full site, pricing and docs are on their way. Windows builds aren't code-signed yet, so SmartScreen may ask you to confirm.