Privacy Policy
This is a courtesy translation. The German version ( Datenschutzerklärung ) is the legally operative document under German and EU law.
1. Controller
The controller within the meaning of the General Data Protection Regulation (GDPR) is:
Benjamin Mateev / Supercharged
Wallstr. 67
10179 Berlin
Email: benjamin.mateev@gmail.com
2. Principle
This site uses no cookies, no user accounts, and no server-side storage of user input. There is no third-party cookie tracking, and no personal data is stored in a database.
3. Local storage (localStorage)
Your progress (completed days), your language preference, and your input in the exercise fields are stored exclusively locally in your browser using the "localStorage" web technology. This data never leaves your browser and is never transmitted to our servers or any third party.
The legal basis for this is Art. 6(1)(f) GDPR (legitimate interest in a functioning, user-friendly application) and/or the technical necessity of this storage for the site's core functionality (progress tracking, language switching). You can remove this data at any time via your browser settings (clear browser data/cache).
4. Hosting
This website is hosted by Vercel Inc., 340 S Lemon Ave #4133, Walnut, CA 91789, USA ("Vercel"). When you access this site, Vercel technically processes server log files (e.g. IP address, user agent, time of access) to ensure the operation and security of the infrastructure. The legal basis is Art. 6(1)(f) GDPR (legitimate interest in the technically error-free and secure operation of the website).
Since Vercel Inc. is based in the USA, data may be transferred to a third country. This takes place on the basis of the EU-U.S. Data Privacy Framework and/or the EU Standard Contractual Clauses (SCCs), which are intended to ensure an adequate level of data protection.
5. Web Analytics
For anonymous, aggregated usage statistics we use Umami Analytics (Umami Software, Inc.). Umami is a cookieless analytics tool: it sets no cookies, collects no personal data, and stores visits only in anonymized, aggregated form. No individual tracking of users takes place; consent is therefore not required.
6. Newsletter (beehiiv)
On this site you can voluntarily sign up for a German-language newsletter. Signup happens exclusively via a double opt-in process: after submitting the form you receive a confirmation email and must confirm your signup by clicking the link it contains. Only your email address is processed, for the purpose of sending the newsletter.
We use beehiiv Inc. (USA) as a processor for sending the newsletter. Since beehiiv is based in the USA, data is transferred on the basis of the EU Standard Contractual Clauses (SCCs), which are intended to ensure an adequate level of data protection.
You can unsubscribe from the newsletter at any time via the unsubscribe link included in every email. The legal basis for this processing is Art. 6(1)(a) GDPR (consent). You may withdraw this consent at any time with future effect.
7. Account and progress
Without an account we store your progress only locally in your browser (localStorage). That data never leaves your device and we have no access to it.
If you create an account to continue the course across devices, we use tiun (tiun GmbH) for sign-in and payment. tiun processes your email address and purchase status. Your course progress (completed days, badges earned, text you type into the prompt fields) is stored separately as one file per account with Vercel Blob in the Frankfurt am Main data centre. The two are linked only by a pseudonymous user ID from tiun.
The legal basis is Art. 6(1)(b) GDPR (performance of a contract). You can have your account deleted at any time, which also deletes the stored progress. Just send us an email.
8. External Services (Claude by Anthropic)
The exercises in this program take place directly in Claude (Anthropic), which you open yourself in a separate tab. This site itself does not transmit any data to Anthropic — you copy the prompts manually into Claude. Your use of Claude is subject to Anthropic's own privacy policy, which you can review there.
9. Your Rights
To the extent personal data is processed, you have the following rights as a data subject:
- Right of access (Art. 15 GDPR)
- Right to rectification (Art. 16 GDPR)
- Right to erasure (Art. 17 GDPR)
- Right to restriction of processing (Art. 18 GDPR)
- Right to data portability (Art. 20 GDPR)
- Right to object (Art. 21 GDPR)
- Right to lodge a complaint with a supervisory authority (Art. 77 GDPR), e.g. the Berlin Commissioner for Data Protection and Freedom of Information
10. Last Updated
This privacy policy was last updated: 2026-07-07.