Terms of Use

HistoryDex Terms of Use

Last updated: October 13, 2026.

1. Purpose

These terms govern your use of the HistoryDex app (iOS and Android) and of the historydex.com website. By using the app, you accept them. If you don't agree, please don't use the app.

2. Publisher and contact

HistoryDex is published by Valentin Vieux, sole trader (entrepreneur individuel), SIREN 940 006 588, 60 rue François 1er, c/o LegalPlace, 75008 Paris, France. Contact: historydexapp@outlook.fr or the site's contact form.

3. Minimum age

You must be at least 13 years old to use HistoryDex. If you are a minor, use the app with the permission of a parent or legal guardian, especially before making any purchase. If you are under 15, data processing based on consent (such as ad personalization) also requires your parent's or guardian's agreement: make this choice together when the app asks, or decline it. You can change it at any time from Profile.

4. Guest account and saved account

When you first open the app, an anonymous guest account is created so you can play right away. You can save it with an email address (sign-in with a one-time code) to get your progress back on another device. Social features (friends, challenges) require a saved account. A guest account that has been inactive for a long time may be deleted, along with its progress. You are responsible for access to your email address.

You can delete your account at any time from the app (Profile) or through the deletion request page; your data is then erased as described in the Privacy Policy.

5. Friends and challenges

With a saved account, you can add friends (friend code, QR code or leaderboard) and send them challenges with a short free-text message (120 characters max). A challenge has 1 to 5 riddles, the same for every participant, to be played within 24 hours. A friendship requires a request and its acceptance; you can remove or block a player at any time. Your public profile (name, avatar, title, number of cards, podiums, month you joined) is visible to other players; your collection card by card and your games are never shared.

6. Code of conduct: zero tolerance

HistoryDex is an educational game open to players aged 13 and over. We have zero tolerance for objectionable content and abusive users. You may not post, in a profile name, a message or any other content:

You also may not bypass filters, cheat, exploit bugs, automate the game or disrupt the service. Names and messages go through an automatic filter, which does not replace your own responsibility.

7. Reporting and blocking

At any time, you can:

Every report is reviewed within 24 hours. If content breaks these terms, we remove it and, depending on how serious it is, we suspend its author's access to messages or social features, or terminate their account, without notice in the case of a serious breach. Clearly illegal content may be passed on to the relevant authorities.

8. In-app purchases and advertising

HistoryDex is free. Optional content (notably HistoryDex Premium) is offered as in-app purchases. Their type (one-time purchase or subscription), their price including taxes and, where applicable, their duration and renewal terms are shown in the app and on the App Store or Google Play before purchase. Payment, billing and refunds are handled by Apple or Google under their own terms. Your purchases are tied to your App Store or Google Play account and can be restored from the app; a subscription is managed and cancelled from that account's settings.

Digital content is delivered as soon as you confirm the purchase: by confirming, you request immediate delivery and acknowledge that you lose your right of withdrawal (Article L221-28, 13° of the French Consumer Code). Riddles, cards and other in-game items have no monetary value and cannot be traded or exchanged for money.

Unless a purchase removes them, the app shows ads (banners, and a rewarded ad that you choose to watch), according to your consent choices.

9. Intellectual property

The app, its texts, cards, illustrations, sounds, trademarks and logos belong to the publisher or its licensors. You receive a personal, non-exclusive, non-transferable right to use it for private, non-commercial purposes. You keep the rights to your name and messages, and you allow us to display them in the game so the social features can work.

10. Availability and liability

We do our best to keep HistoryDex running without interruption, but the service may change, be interrupted for maintenance or contain errors, including historical ones. To the extent permitted by law, we are not liable for indirect damages or for the behavior of other players. Nothing in these terms limits the rights you have by law as a consumer.

11. Personal data

How we process your data is described in the Privacy Policy.

12. Changes

We may change these terms, for example when a new feature arrives. The date at the top of the page shows the version in force; if there is a significant change, we will let you know in the app.

13. Governing law

These terms are governed by French law. In case of a dispute, please write to us first: we will look for an amicable solution. Failing that, the French courts have jurisdiction, without prejudice to the protective rules of your country of residence if you are a consumer. These terms exist in several languages; in case of discrepancy, the French version prevails.