Terms of Use
Last updated: 1 August 2026
> Courtesy translation. Only the French version is legally binding: Conditions Générales d'Utilisation. In the event of any discrepancy, the French text prevails.
These Terms of Use govern access to and use of the Derja service, available at derja.fr, published by Ismael Dubuc, sole trader (SIREN 939 197 554), 30 Allée Sidney Bechet, 93430 Villetaneuse, hereinafter “the Publisher”.
By creating an account, the user acknowledges having read these Terms and accepts them without reservation.
1. Purpose
Derja is an application for learning Derja (Tounsi, Tunisian colloquial Arabic), available on the web and through the iOS and Android mobile apps, by means of vocabulary, phrase, conjugation and grammar exercises built on a spaced repetition algorithm (SRS).
2. Access to the service
2.1 Conditions of access
The service is open to any natural person aged 13 or over with internet access and a compatible web browser. The Publisher does not guarantee compatibility with every browser or device.
2.2 Account creation
Using the service's features requires creating an account with a valid email address. The user undertakes to provide accurate information and to keep it up to date.
2.3 Account security
The user is responsible for keeping their credentials confidential. Any use of the service with those credentials is deemed to have been carried out by the user themselves. In the event of loss, theft or unauthorised use, the user must inform the Publisher immediately at contact@derja.fr.
3. Plans and access
3.1 Free access
Derja offers limited free access allowing the service to be tried out (a capped number of daily cards).
3.2 Premium subscriptions
The subscription plans are described on the pricing page and in the Terms of Sale. Access to premium features is conditional on taking out and maintaining an active subscription.
4. User obligations
The user undertakes to use the service in accordance with applicable law and these Terms. In particular, the user shall not:
- Access the service by any means other than the interface provided
- Attempt to circumvent protection or authentication mechanisms
- Share their credentials or their access with third parties
- Scrape, extract or reproduce the service's content (vocabulary, exercises, learning data) for commercial or non-commercial purposes without prior written authorisation
- Use the service for unlawful or fraudulent purposes, or in ways harmful to the Publisher or to third parties
- Submit unlawful or offensive content, or content contrary to public order (should interactive features be added)
5. Intellectual property
All of the service's content (texts, exercises, teaching vocabulary, conjugations, grammar notes, design, logo, the “Derja” trade mark, source code) is the exclusive property of the Publisher and is protected by copyright.
A subscription grants the user a personal, non-exclusive, non-transferable and revocable right of use, limited to private, non-commercial use of the service for the duration of the subscription.
6. Availability of the service
The Publisher endeavours to keep the service available 24/7 but cannot guarantee uninterrupted availability. Maintenance may be carried out, preferably outside peak hours. The Publisher undertakes to inform users of significant planned maintenance.
The Publisher cannot be held liable for service interruptions caused by force majeure, by a failure of communication networks, or by third parties (host, internet service provider).
7. Limitation of liability
The service is provided “as is”. The Publisher does not guarantee that the service will achieve any particular learning outcome. Progress depends on the user's own commitment.
The Publisher's liability shall not exceed the amounts actually paid by the user during the 12 months preceding the event giving rise to the damage.
8. Personal data
The processing of personal data is described in the Privacy Policy, which forms an integral part of these Terms.
9. Cookies
The use of cookies and similar technologies is described in the Cookie Policy.
10. Changes to the service and to these Terms
The Publisher reserves the right to change the service or these Terms at any time. Users will be informed by email of any substantial change at least 30 days before it takes effect. In the absence of objection within that period, the new Terms will be deemed accepted. If the user objects, they may cancel their subscription under the conditions set out in the Terms of Sale.
11. Termination
11.1 Termination by the user
The user may delete their account at any time from the “My account” section, or by sending a request to contact@derja.fr. Termination results in the deletion of data in accordance with the Privacy Policy.
11.2 Termination by the Publisher
The Publisher may suspend or terminate a user's access in the event of a breach of these Terms, following a formal notice that has gone unheeded (except for serious conduct justifying immediate termination).
12. Governing law and jurisdiction
These Terms are governed by French law. In the event of a dispute, the parties will endeavour to reach an amicable solution. Failing that, and after recourse to the consumer ombudsman in accordance with the Legal Notice, the competent courts will be those of the Publisher's registered place of business, unless a legal provision applicable to consumers provides otherwise.
13. Contact
Email: contact@derja.fr
Post: Ismael Dubuc, 30 Allée Sidney Bechet, 93430 Villetaneuse, France