Privacy Policy
Last updated: 28 September 2026.
This policy explains what happens to your data when you use shell.trainer (the "site"). The short version: there is no account, nothing you type in the terminal ever leaves your browser, and the only third party that sets cookies is Google, to show ads, with your consent where the law requires it.
What we collect
shell.trainer requires no account and collects no personal information directly. Everything you type in the terminal simulator runs locally in your browser and is never sent to any server. Fonts, scripts and images are served from our own domain.
Like every website, our hosting provider (Vercel) processes technical data needed to deliver pages: your IP address, browser type and the page requested: in short-lived server logs used for security and reliability. We do not use these logs to identify or profile visitors.
Advertising and cookies
The site shows ads served by Google AdSense. Google and its partners use cookies and similar technologies to serve ads, to measure their performance and, if you allow it, to personalise them based on your visits to this and other websites.
- Visitors in the European Economic Area, the UK and Switzerland are shown a consent message from a Google-certified consent management platform before any advertising cookie is stored. You can accept, reject or choose by purpose, and change your choice at any time from the "Privacy and cookie settings" link that the message leaves on the page.
- If you do not consent, Google may still show non-personalised or limited ads, which do not use cookies for personalisation.
- You can opt out of personalised advertising at Google Ads Settings, and read how Google uses information from sites that use its services.
Analytics
We do not use any analytics or visitor-tracking service. If privacy-respecting, aggregate analytics are added later, this section will name the tool before it goes live.
What stays in your browser
The terminal simulator, the interactive course and your lesson progress run entirely on your device. Your progress is kept in your browser's local storage, not on any server and not tied to any account. Clearing your browser data, or pressing the reset button in the course, removes it completely. This storage is strictly necessary for the feature you asked for, so it does not require consent.
Buying the book
The ebook is sold through a third-party store that acts as merchant of record: it handles payment, invoicing and VAT under its own privacy policy, which you will see at checkout. We receive only what is needed to deliver the book and its updates, and never your card details.
If you write to us, we keep your message and address only to reply and, where relevant, to follow up on the same topic. We never add you to a mailing list or share your address.
Your rights
Under the GDPR you may request access to, correction of, or deletion of any personal data we hold about you, and object to or restrict its processing. Since we hold none by default, requests will normally concern email correspondence. We answer within 30 days. You also have the right to complain to your data protection authority: in Spain, the Agencia Española de Protección de Datos.
Children
The site is a general-audience educational resource and is not directed at children under 13. We do not knowingly collect data from children.
Contact
Questions about this policy, or a request concerning your data: hello@shelltrainer.com, or via the contact page.