Legal
Cookie policy
This site uses three first-party, technical cookies, which cannot be switched off without breaking the service, and one for analytics, which is not installed until you accept it. There are no advertising cookies and no social-network cookies.
The necessary cookies
teachers_session | Remembers that you have signed in. It holds nothing but your user identifier, cryptographically signed so that it cannot be forged. It does not keep your email, your name, or anything about your classes. It lasts 30 days, or until you press “Sign out”. |
|---|---|
teachers_lang | The language you want to read the interface in, so that it does not have to be guessed from your browser on every page. It lasts 30 days. |
teachers_consent | Your answer to the question on this very page: a single word, “granted” or “denied”. It is what stops us asking again on every visit. It lasts 6 months. |
Being strictly necessary for the service to work, these three do not require your consent. They are first-party — read and written from this domain, and they never leave it — and none of them can follow you around other sites.
Analytics, if you accept it
We use Google Analytics, loaded through Google Tag Manager, to know which pages get visited, where people arrive from and what breaks. It tells us how many people use each screen; it does not tell us who you are.
Nothing is loaded until you press “Accept”. Until you do, this site makes not one request to Google: the tag is never written into the page, so there is nothing to block and no cookie to delete. If you accept, Google installs _ga and _ga_<id>, which last two years and tell a new visit from a returning one.
The controller of those cookies is Google Ireland Limited, with transfer to the United States under the EU–US Data Privacy Framework. You can read their privacy policy.
You have not answered yet, so nothing is being loaded.
Changing it applies to this browser. If you use your phone and your computer, each one keeps its own answer.
The anti-robot check
On two forms — creating an account and asking for a quote — we use Cloudflare Turnstile to check that whoever is sending them is a person. It loads only on those two pages and sets no cookies and does not follow you around the web: no profile, no persistent identifier, no advertising use. Cloudflare receives your IP address and technical signals from your browser while the check runs.
It is what makes those two forms possible without robots using them, so there is no box to switch it off: if you would rather not go through it, write to us and we will sort it out by email.
Stripe's cookies, when you pay
When you buy credits we send you to Stripe's checkout, hosted on Stripe's own domain. There, Stripe sets its cookies to process the payment and detect fraud. They are Stripe's cookies, on Stripe's site, governed by their privacy policy. None of them are left on our domain.
How to remove them
You can delete or block cookies from your browser settings. If you block the session cookie you will not be able to sign in, and if you block the consent one we will ask you again on every visit.
Last updated: 18 de agosto de 2026.