Privacy

Short version: worksheets are made in your browser. We have no student accounts and no student data, and we don't use cookies or ad trackers.

Worksheets

• Sheets are generated by JavaScript in your browser. The skill, number of problems, type and seed are in the page link; nothing you print is sent to us.
• stepcheck is for teachers, tutors and parents. Students don't use it and never enter anything.

What we count

We count page views and button presses (sheet made, printed, link copied, Pro clicked) together with the skill and settings, without cookies. To tell visits apart we use a hash of your IP address and browser combined with a salt that changes every day, so visits can't be linked across days. We keep these counts in Amazon Web Services in Frankfurt, Germany (eu-central-1).

Your email, if you give it

If you ask to hear when Pro opens, we store that email address and the plan you clicked, and use it only to write to you once when Pro opens. Email support@jestr.ai to have it deleted.

Who

Duke Security, Inc. (Jestr), see Imprint. We don't sell or share data.

Last updated 2026-10-02.