Privacy policy

Last updated: 5 November 2026.

Who is responsible

[FULL NAME OF THE OWNER], contact email [CONTACT EMAIL].

What stays on your device

There are no accounts or cookies. Each answer you give stays on your device. Also kept only in your browser's local storage are your best level, your history, the name you type for a challenge, your votes, your progress, your license key if you buy the plan, and the channel you came from. You can delete them by clearing this site's data in your browser.

What is sent, with nothing that identifies you

• When you finish a test, your level is added to a counter per level, at most once a day per browser. Only that number is kept, to show comparisons such as "better than 64%".
• Statistics with Umami, in aggregate: pages viewed, the channel you came from (a video, for example), the type of browser and these events: starting and finishing the test, with your level, your weak spot and the time; progress in the training and the route, with correct answers; sharing; clicking a price; voting for a feature; and technical errors on the page. Umami uses no cookies and does not store your IP address. We ask it not to receive the query part of addresses, where a name could be.

The legal basis is our legitimate interest in knowing whether the test works and improving it (GDPR article 6.1.f).

Against abuse: a fingerprint that lasts one day

So that nobody can fake the counters or flood the forms with a program, we limit requests per visitor. For that we keep a hashed fingerprint of your IP address, mixed with a key and the date, which cannot follow you from one day to the next and is deleted the following day. We do not store the IP itself. The legal basis is also our legitimate interest (GDPR article 6.1.f).

The challenge link

If you type a name to challenge your friends, that name goes inside the link you share, and whoever opens it will see it. We do not store it and it does not reach our statistics. Like any web address, it can appear in the technical connection logs of our hosting.

Notice when payment opens (optional)

While the plan cannot be paid for yet, you can leave us your email. We store the email, the plan you clicked, where you clicked it, the channel you came from, the language, your level and the date. We only use it to let you know. The legal basis is your consent (GDPR article 6.1.a), which you can withdraw at any time. It is deleted automatically after 12 months, or sooner if you ask.

Paid plan

If you buy the plan, payment is handled by Polar (polar.sh) as the seller: Polar collects your payment and billing details and processes them under its own privacy policy. We never see your card details. Your license key is kept in your browser and, to check it is valid, our server sends it to Polar without storing it. Your progress stays on your device, although the events above include your correct answers with nothing that identifies you. If you create a backup code, it carries your progress and your key: keep it yourself and do not share it. See also the plan terms.

If you withdraw from the contract

If you use the withdrawal form, we store your name, your email, the reference you write and the date, to deal with your request and as proof for both sides. The legal basis is complying with a legal obligation (GDPR article 6.1.c). We keep it for 3 years and then it is deleted.

Who helps us

The site and its data are hosted on Cloudflare, which also processes technical connection data to serve and protect the site. Statistics are processed by Umami. Both act as data processors. Some of these providers may process data outside the European Economic Area with the safeguards the GDPR requires.

Minors

This site is not aimed at minors. If you are under 16, do not leave us your email. The paid plan is for adults only.

Your rights

You can ask for access, rectification, erasure, objection, restriction or portability of your data by writing to [CONTACT EMAIL]. If you think we are not handling them properly, you can complain to the data protection authority of your country: in Spain, the Agencia Española de Protección de Datos (aepd.es); in Ireland, the Data Protection Commission (dataprotection.ie).

Changes

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