Last updated: 11 June 2026
NumericalReasoningPractice.com (a Cognivy product) helps you practise numerical reasoning tests. This policy explains what data we collect, why, how long we keep it, and the choices you have. The short version: we collect the minimum needed to run the site, our practice analytics are pseudonymous, we never sell your data, and we show no ads.
Account data. If you create an account, we store your email address and an account id, handled by Supabase (our authentication and database provider). If you sign in with Google, Google shares your email address with us; we receive no other profile data. You can use the free test and browse the whole site without an account.
Practice results. Your diagnostic and practice results (scores, per-topic accuracy, streaks) are stored against your account so your dashboard works. If you take the free test without an account, the result is held only in your own browser until you choose to sign up.
Answer analytics. Each answered question is recorded as an event (which question, which option, correct or not, time taken) so we can calibrate question difficulty from real solve data. These events carry no name or email — they are keyed by a one-way hash of your account id, or for visitors a random session id that is only stored as a cookie with your consent (see cookies below).
Payments. Purchases are processed by Lemon Squeezy as the merchant of record. Your card and billing details go to Lemon Squeezy, not to us; we receive the order confirmation and the account id needed to unlock your purchase.
Hosting logs. The site runs on Vercel, which keeps standard server logs (including IP addresses) for security and operations.
Essential cookies — these make the site work and need no consent:
Optional cookie — set only if you accept in the cookie banner:
We also use your browser’s local storage to hold your free-test result on your device until you sign up. It never leaves your browser unless you create an account. We use no third-party analytics scripts and no advertising trackers.
Only the processors needed to run the site: Supabase (database and authentication), Vercel (hosting), Lemon Squeezy (payments, as merchant of record) and Google (only if you choose Google sign-in). We do not sell or rent personal data, and we share nothing with advertisers.
Account data and results are kept while your account exists and deleted when you ask us to delete it. Pseudonymous answer events are kept for difficulty calibration; once your account is deleted they can no longer be connected to you. Lemon Squeezy retains order records as required by tax law.
Under UK and EU data protection law you can ask for a copy of your data, ask us to correct it, or ask us to delete your account and everything tied to it. Email us and we will action it — no forms, no friction. You can also withdraw cookie consent at any time by clearing the site’s cookies in your browser; the banner will ask again on your next visit. If you are unhappy with how we handle your data you can complain to your local supervisory authority (the ICO in the UK).
Email hello@cognivy.io for anything in this policy, including access and deletion requests.
If we change what we collect or who we share it with, we will update this page and the date at the top before the change takes effect.