Legal notice
Cayer is built by one person, not a company. Here’s who, and how to get in touch.
This is an English translation, provided for your information. Only the French version is legally binding: Mentions légales.
Publisher
- Legal form
- Sole proprietorship (entreprise individuelle)
- contact@cayer.fr
- SIRET
- 10751408500011
- SIREN
- 107514085
- Business activity
- 62.01Z · Computer programming (programmation informatique)
- Registered since
- July 14, 2026
The director of publication is the individual registered under the SIRET number above. Cayer is exempt from VAT under the small business exemption (franchise en base): VAT not applicable, article 293 B of the French General Tax Code (code général des impôts).
Host
The website and the app are hosted by Hetzner Online GmbH, Industriestr. 25, 91710 Gunzenhausen, Germany: https://www.hetzner.com. The servers are located in the European Union.
Intellectual property
Cayer’s code, text, drawings and page rulings belong to its publisher. What you write in your notebooks belongs to you, entirely and without exception: Cayer doesn’t use it, doesn’t analyze it and doesn’t sell it.
Reporting content
To report illegal content or a violation of your rights, write to contact@cayer.fr. Every report gets a response.
To find out what data is kept and how to have it deleted, see the privacy policy.