Privacy
Last updated November 14, 2026
This explains what Cellwise, operated by Alexander J Rigas (“we”) collects, why, who else handles it, and how to get it deleted. We collect as little as we can, and we don’t sell or rent your information to anyone.
If you don’t create an account
Your progress is kept in your own browser, not sent to us. We don’t use advertising trackers or analytics services. If we ever add analytics, we’ll update this page first.
What we store if you create an account
- Your email address
- A scrambled version of your password. We can’t read your actual password
- Your course progress, flashcard schedule, exam attempts and results
- If you add them: your name, your certificates, and any classes you run or join
- If you buy a plan: which plan, when it renews or ends, and the payment provider’s reference for it
We use this only to run Cellwise for you: saving your progress, grading exams, issuing certificates, and giving paid features to people who paid for them.
Payments
Purchases are handled by Polar (polar.sh), which sells Cellwise plans as our reseller, and by Polar’s card processor. They collect your card details, billing address and tax information. We never see or store your card number. We share your email address and an account number with Polar, so a purchase can be matched to your account. Polar’s own privacy policy covers what it does with your information.
Cookies and storage in your browser
- One cookie keeps you logged in. It’s needed for the site to work, and it isn’t used for tracking.
- Your browser’s storage keeps your progress, so it works without an account.
Who else handles your information
- Cloudflare hosts the site and its database, sends our emails (such as password resets), and runs the check that you’re not a robot on sign-up and login forms.
- Polar handles payments, as described above.
These companies may store information outside your country, including in the United States.
Who can see your information on Cellwise
- The leaderboard shows your name and weekly points, only if you turn it on.
- A certificate’s page shows your name, score and skills to anyone who has its ID.
- If you join a class, its owner sees your name, email, lessons completed, points and last active date.
How long we keep it
We keep your account information until you delete your account. Deleting it removes your account, progress, certificates, classes and plan from our database straight away. Polar keeps records of purchases for as long as tax and accounting laws require. Our host keeps short-lived technical logs, such as error reports, for a few days.
Your choices and rights
You can change your name and leaderboard setting, leave a class, or permanently delete your account from your account page. To get a copy of your information, correct it, or ask any privacy question, email support@getcellwise.com. We’ll answer within 30 days. If you’re not happy with our answer, you can complain to the privacy regulator where you live. In Canada, that’s the Office of the Privacy Commissioner of Canada.
Children
Cellwise isn’t meant for children under 13, and they shouldn’t create an account. If you think a child under 13 has given us information, email us and we’ll delete it.
Changes
If we change this policy in a way that matters, we’ll update the date above and, for big changes, email account holders first.