Terms of use

What Lemma is

Lemma is a math study tool: a linear course, step-by-step checking by a symbolic verifier, spaced review, and an AI tutor that helps without handing over answers. It is offered free, as it is, with a daily allowance on the parts that cost money to run.

The free allowance

Each day (UTC) a free account may make 10 tutor asks, start 3 voice sessions, and have 40 lines of handwriting read. Working problems, step checking, lessons, and review are not limited. The numbers may change; the current ones are always shown in Settings.

Fair use

Use Lemma to study. Do not try to pull answers out of the tutor, scrape or automate the service, create accounts to get around the allowance, or interfere with other learners. Lemma may rate-limit or close an account that does.

Your record

Your study record is yours. Lemma keeps it so the app can pick up where you left off, and you can delete it at any time from Settings. Keep your device and your cross-device link private; anyone holding them can open your record, because there is no password to stop them.

No guarantees

Lemma is built carefully, and its step verifier is deterministic, but the tutor is an AI model and can be wrong. Nothing here is a promise of a particular placement or test score, and the service may change or pause without notice. It is provided without warranty, and Lemma's liability to you is limited to the amount you paid for it, which is nothing.

Age

You must be 13 or older to use Lemma.

Changes and contact

If these terms change in a way that matters, the date at the top will move and the change will be described on this page. Questions: randy@roviqai.xyz.