Privacy

No account, no email

Using Lemma does not need your name, email address, or a password. When you start, it mints a random learner id and stores it in a signed cookie on your device. That id is the only thing that ties your study record to you. If you want the same record on another device, Settings gives you a link that carries the id for 30 days; treat it like a key.

What is stored

• Your study record — the problems you have worked, each step you entered, which skills you have shown independently, your spaced-review schedule, your notes and scratch ink, and your tutor conversations. This is the whole of what the app needs to pick up where you left off.
• Study events — a timestamped log of attempts, hints, diagnoses, and outcomes. They are what the progress views are built from.
• Daily tutor usage — how many tutor asks (10/day), voice sessions (3/day), and handwriting reads (40/day) you have used today, so the free allowance can be enforced. Counts reset every day (UTC).

Everything is kept in one database on Cloudflare. Step checking is done by Lemma's own symbolic verifier on the server; nothing about a step leaves Lemma unless you ask the tutor.

The optional waitlist

The landing page has one optional form: leave an email address to be told when full access opens. Nothing in the app needs it. If you use it, Lemma stores the address, the page it came from, and when it was added, and uses it only for that message. A notification with a masked form of the address (for example ra***@gmail.com) may be posted to a private channel the maintainer reads, so a new signup is noticed. To count repeated attempts from one network, the form keeps a one-way hash of your IP address for the current hour only. To be removed from the list, email randy@roviqai.xyz.

What goes to an AI provider

When you ask the tutor a question, start a voice session, or have handwriting read, Lemma sends the AI provider your typed (or spoken) question, the current problem, your verified work on it so far, and — for handwriting — an image of the line you wrote. It does not send your name (it does not have one), your learner id, or your history beyond that problem. Lemma currently uses models hosted on Microsoft Azure. Providers process this to answer and may hold it briefly under their own terms; Lemma does not use it to train anything.

What is not done

• No ads, and no advertising or analytics trackers.
• No selling or sharing of your record with anyone.
• No cookies other than the session cookie that keeps you signed in.

Deleting your data

You can delete everything at any time from Settings ("Delete my data"), or by sending POST /api/account/delete while signed in. This removes your study record, your event log, your topic history, and your usage counts in one step and clears the cookie. There is no recovery afterwards, so export what you want first.

Children

Lemma is not for children under 13. If you are under 13, please do not use it.

Contact

Questions about any of this: randy@roviqai.xyz.