Privacy Policy

What we collect, why, who can see it, and how to have it removed.

Version 2026-08-18 · Last updated 18 August 2026

1. What we collect

Information you give us

• Email address — required to create an account and to send password resets. If you sign in with Google, we receive the email address on that Google account.
• Username — shown publicly.
• Full name — required, but never shown to other users.
• Date of birth — required. Never shown to other users. Used to understand the age range of our audience in aggregate.
• Gender, country and solver type — optional. Country is shown publicly; gender and solver type are not.
• Profile picture — optional, and shown publicly if you upload one.
• Password — if you register with one. We never see it: it is hashed by our authentication provider before storage, and we cannot read or recover it.

What you do on the site

• Which problems you attempt, what you answered, whether it was correct, how many attempts you took, and how long you spent
• Problems you give up on and problems you bookmark
• Your rating, rating deviation, XP and streaks
• Difficulty ratings you cast on problems

What you write

• Comments and replies in discussion threads, and your votes on them
• Problems you propose and topics you suggest
• Reports you file about problems or comments, and feature requests or bug reports you send

Technical information

Our hosting and database providers record standard server logs, which include IP addresses and browser information, for security and abuse prevention. We do not use advertising trackers, and we do not use third-party analytics that follow you across other websites.

2. Why we collect it

• To run your account — signing in, resetting your password, showing your profile.
• To make the site work — grading answers, calculating your rating and XP, building leaderboards, showing discussions.
• To calibrate difficulty — solve rates, attempt counts and timings across all solvers are what make a problem's rating meaningful.
• To moderate — investigating reports, recording upheld moderation decisions, and enforcing bans.
• To understand our audience — aggregate counts by country, age band, gender and solver type. These are only ever reported as totals, and any group smaller than five people is folded into an "Other" category so that no individual can be identified from them.
• To contact you — password resets, account emails, and notifications about your own activity.

We do not sell personal data, and we do not share it with advertisers.

3. What is public and what is not

Administrators can see the private fields above where it is necessary to run the site — for example, an email address when investigating a report or a ban.

4. Who else sees your information

We use a small number of service providers. They process data on our behalf and under their own privacy policies:

• Supabase — database, authentication and file storage. Holds essentially everything described above.
• Cloudflare — serves the website and its domain. Sees request data such as IP addresses.
• Resend — sends account email such as password resets. Sees your email address and the contents of those messages.
• Google — only if you choose to sign in with Google. Google tells us your email address and basic profile information; we do not receive your Google password, and we do not post anything to your Google account.

We may also disclose information where we are legally required to, or where it is necessary to investigate abuse or protect someone's safety.

5. Cookies and local storage

We do not use advertising or tracking cookies. The site stores a small amount of data in your browser:

• Your sign-in session — so you stay signed in between visits. Clearing it signs you out.
• Your theme choice — light or dark.
• Your last used filters on the problem lists, so returning to a list puts you back where you were. This is cleared when you close the tab.

6. How long we keep it

We keep your account and its associated activity for as long as your account exists.

If your account is deleted, your profile, submissions, bookmarks, reports and notifications are deleted with it. Two things are treated differently:

• Comments and accepted problems may remain, because other people's discussions depend on them. Tell us if you want them removed as well and we will do so where it does not destroy someone else's thread.
• Moderation records — if your account was banned, we keep a record of the email address and the reason, so the ban can be enforced. Without this, a ban would mean nothing.

Server logs held by our providers are kept for their own limited retention periods, typically days to weeks.

7. Your rights

• See and correct it — most of your details can be edited from your Profile page at any time. Optional fields can be cleared.
• Get a copy — ask us and we will send you the data we hold about you.
• Delete it — ask us and we will delete your account, subject to the exceptions above.
• Object or complain — write to us at the address below. If you are in a country with a data protection authority, you may also complain to it.

Depending on where you live, you may have additional rights under laws such as the Philippine Data Privacy Act, the UK and EU GDPR, or similar legislation. We aim to honour these requests regardless of where you are.

8. Children

Robols Math is aimed at students preparing for mathematics competitions, and we expect some of our users to be minors.

If you are under 13 — or under the minimum age in your country — please ask a parent or guardian before creating an account, and have them read this policy with you. If we learn that we have collected information from a child in a way that requires parental consent we do not have, we will delete it.

Parents and guardians can contact us at any time to see, correct or delete a child's information.

9. Where your data is held

Our providers operate globally, and your information may be stored and processed outside your own country. We choose providers that commit to appropriate safeguards for such transfers.

10. Changes to this policy

If we change this policy in a way that materially affects you, we will ask you to review and accept it the next time you sign in. Minor clarifications will simply be published here with an updated version number.

11. Contact

Questions, requests or complaints: admin@robolsmath.com