Privacy policy

Last updated: 2026-11-10

Who we are

Thinkle is made by JTA DEVS sp. z o.o., ul. 11 Listopada 1, Dąbrowa Górnicza, Polska, the controller of your data. Contact: jta.devs@gmail.com.

In short

You can use Thinkle without an e-mail address, a password or your real name. We show no ads in the app and do not sell data. Only if you agree in the app do we use Meta’s tool to measure our own ads on Facebook and Instagram (see “Measuring our ads”); without your consent we use no third-party analytics or advertising tools.

Data that stays on your phone

Your results, levels, daily plan, settings and practice history are stored only on your device. They are deleted when you delete the app.

Online features

For the weekly league, friend challenges and live duels the app creates an anonymous account the first time you go online: a random ID, a secret key (we store only its hash), the nickname you choose, your avatar, the app language and the country set in your phone’s region settings (not your location; it puts you on the duel leaderboard of your country and of Europe).

To run these features the server stores: your league points per day and week, how many exercises you did and solved in the week (to spot cheating in the league), the time zone of your phone (to count league days), a short record of each counted exercise (game and time, to avoid counting it twice; deleted after a few days), challenges you create and your challenge results, and your duel results and rating. Other players see your nickname, avatar, country flag, points and scores.

Statistics

To tune how hard the games are, we count how often exercises at each level are solved. These counts are aggregated and are not linked to your account.

To see how many players come back, we note whether you played on the 1st, 7th and 30th day after your account was created. We only look at these notes as totals, never per person.

Technical data

Your IP address is used only briefly in server memory to protect the service against abuse (rate limiting); we do not save it in our database. Our hosting provider Fly.io (servers in Frankfurt, EU) may keep technical connection logs for a limited time.

Reminders

Daily reminders are scheduled locally on your phone and only if you turn them on. We do not receive a push token or any data about them.

Thinkle Plus subscription

Thinkle Plus is an optional subscription. Payment is handled entirely by Apple (the App Store) under its own terms and privacy policy; we never see your card details, name or Apple ID.

To check whether you have Plus and to restore purchases, the app uses RevenueCat (RevenueCat, Inc., USA), which processes on our behalf: your anonymous player ID, your purchases and subscription status (product, price and currency, dates, renewal and trial status, transaction IDs), the store country and basic technical data (app and system version, the IP address of the connection). We also note on which screen the Plus offer was shown, to improve it. RevenueCat does not receive your name, e-mail address or contact details.

RevenueCat is based in the USA; the transfer is protected by standard contractual clauses approved by the European Commission (part of our data processing agreement with RevenueCat).

The legal basis is the contract: providing the subscription you bought (Art. 6(1)(b) GDPR). We keep purchase data as long as it is needed to provide and restore the subscription; you can ask us to delete it at jta.devs@gmail.com. Cancel the subscription in your Apple ID settings (iPhone Settings → your name → Subscriptions); deleting the app or your online data does not cancel it.

Measuring our ads

Thinkle advertises on Facebook and Instagram. Only if you agree in the app (in a window after the first setup, or later in Settings → Ad measurement), the app uses the Meta SDK of Meta Platforms Ireland Ltd. It tells Meta that the app was installed and opened, that you finished the setup, your first exercise and a daily plan, and that you came back for a third day with a plan, together with basic technical device data (such as model, system version, language and the IP address of the connection). We never send scores, levels, your nickname or other game data. Without your consent the Meta SDK does not start at all.

If you also allow it in Apple’s tracking window, Meta receives your device’s advertising identifier (IDFA); otherwise Meta measures our campaigns only in aggregate, without it. If you start a free trial or buy Thinkle Plus, RevenueCat reports this to Meta together with Meta’s anonymous app ID, so we can see which ads lead to subscriptions.

Meta uses this data to measure and deliver our ads and also processes it under its own privacy policy (facebook.com/privacy/policy). Meta may transfer data to the USA; Meta Platforms, Inc. is certified under the EU-U.S. Data Privacy Framework.

The legal basis is your consent (Art. 6(1)(a) GDPR). You can withdraw it at any time in Settings → Ad measurement (Meta); from then on nothing more is sent. Withdrawing does not affect what was sent before.

Legal basis

We process the data to provide the features you use (Art. 6(1)(b) GDPR) and, for security and aggregated statistics, on the basis of our legitimate interest in a safe, well-balanced game (Art. 6(1)(f) GDPR).

How long we keep it

Online data is kept as long as your anonymous account exists. You can delete it at any time in the app: Settings → Delete online data. This removes the account and all related data from our server immediately.

Your rights

You have the right to access, correct and delete your data, to restrict or object to processing and to data portability. Write to jta.devs@gmail.com. Because the account is anonymous, we may ask you for your player ID (shown in Settings) to find it. You can also complain to a data protection authority; in Poland this is the President of the Personal Data Protection Office (UODO).

Children

Thinkle is a general-audience app. We do not ask for age, name, e-mail address or location.

Changes

If this policy changes, we will update this page and the date above.