Privacy

Privacy policy

Last updated 2026.

What we collect

Calcu is local-first. Your exercise progress, mastery history, and license state are stored on your own device, not on our servers. We do not require an account to use Calcu.

What leaves your device

Only what's strictly required for licensing (activation) and, if you choose to purchase, payment processing through our payment provider. We never transmit your exercise data, progress, or spreadsheet content.

Marketing site data

This website may use minimal, privacy-respecting analytics to understand aggregate traffic. It does not track you across other sites.

Contact

Questions about this policy can be sent through our contact page.