Sanctum is a bring-your-own-key AI workspace that runs in your browser or as a desktop app. Chat with every major model — your keys and conversations never leave your device.
No account. No server. No tracking. Just paste a key and start.
Stored in your OS keychain or this browser — borrowed for a single request, never written to a server or a database.
Runs fully in your browser, or as a native desktop app. There's no backend to trust because there isn't one.
Every major provider and any model id. Swap between them mid-conversation; branch, edit, and never lose a thread.
Everything you'd expect from a serious client — built so that none of it depends on someone else's servers.
Anthropic, Groq, OpenRouter, NVIDIA, and any OpenAI-compatible endpoint. Pick from the live model list — or type any model id, even ones nobody lists.
Every edit or regenerate forks a new branch instead of overwriting. Page between versions; nothing you say is ever lost.
Save a system prompt, temperature, and default model as a reusable preset. Switch voices in a click.
Spin up a conversation that is never written to history and vanishes the moment you leave it.
Find any past chat by title, and back up your entire history as a JSON file you own — restore it anywhere.
Run instantly in the browser, or install the native desktop app that works offline and reaches providers the browser can't.
Instant. Nothing to install. Opens in any modern browser, keeps your keys and chats in local storage, and installs to your home screen as a PWA.
Launch SanctumA tiny native window that works offline and can reach providers the browser blocks. Built with Tauri — no bundled browser, just a lean native shell.
Download for WindowsWindows 10/11 · ~27 MB · unsigned, so click “More info → Run anyway”. macOS & Linux next.