Privacy at Computus

Last updated: September 2026

The short version

Your math is yours. Computus runs its calculations entirely in your browser. We run no ads and no advertising trackers. We use privacy-friendly, aggregate Google Analytics only to understand which pages and tools are popular — never to see what you type or calculate.

Usage statistics

We use Google Analytics (GA4) to count page visits and tool openings in aggregate. This uses cookies set by Google and collects anonymized technical data (approximate region, device type, pages visited). It never includes your calculations, notes, files, or chat messages. You can block it with any standard ad/tracker blocker or browser privacy setting — Computus works the same either way.

What stays on your device

• Calculations, sessions, notes, files, custom functions and settings — stored in your browser's local storage / IndexedDB.
• Your AI provider API key — stored locally, unencrypted, and sent directly from your browser to the provider you choose. It never touches Computus servers.

What leaves your device (only if you choose)

• AI chat — messages you send go to the AI provider you configure (OpenAI, Anthropic, Mistral, etc.), governed by that provider's privacy policy. Don't paste personal data or secrets into chat.
• Account, forum & marketplace — if you sign in, your username, posts and published functions are stored on our own server (computus.app) so they can sync and be shared. Passwords are stored only as secure bcrypt hashes. Publishing a function makes its code public.
• Marketplace review — submitted functions are sent to an automated AI reviewer (Mistral) through our proxy before publication.

Cookies

Computus itself sets no tracking cookies — the app uses your browser's local storage for the features above. Google Analytics (see "Usage statistics") sets its own first-party cookies (_ga, _ga_*) to distinguish visits in aggregate.

Your control

Settings → About & Data lets you export everything or delete all local data at any time. For account data removal, contact us via the forum.

Students

Computus is built by students, for students. You can use every tool without an account. If you're under 13 (or the age of digital consent in your country), please ask a parent or guardian before creating an account.