Your questions stay in your browser. Searching, building formulas and checking practice answers all happen on your own device. What you type there is not sent to Cell Coach.
No accounts. Cell Coach never asks for your name, email or password.
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Your progress stays on your device. Finished practice problems are saved in your browser. Clearing your browser data removes them.
Suggestions are optional. If you use a "Suggest this question" link, what you type goes to a separate online form so it can be read. Please leave out private details.
Hosting. The company that hosts the site may keep basic technical records, such as IP addresses, to run and protect its service.