Anonymous letter · privacy
App “Lettre anonyme d’une rivale” (“Anonymous letter from a rival”), a Dynamo Game by Krystaa Studio. Last updated: 11 November 2026.
In short
- We never ask for an account, a name, an email address or a phone number.
- Your photos (“the same corner of your home”) stay on your phone. They are never sent anywhere.
- The app has no access to your contacts, your messages, your location or your microphone.
What the game keeps to bring your story to life
So that your story can continue from one day to the next, our server keeps, under an anonymous identifier randomly generated on your phone: your progress in the story, your choices, the position of your “doubt needles”, the days played and, if you use it, what you write in the Confessional (anonymous, moderated, never shown as is to other players). This data is only used to write the rest of your story and to improve the game. It is hosted in the European Union (Supabase, Frankfurt) and deleted on request, and automatically after 12 months without playing (purchase records are kept, without personal data).
How the story is written
The days are written by an artificial intelligence (Anthropic, with OpenAI as a backup) based on your choices in the game. No personal data is sent to them: only the state of the story.
Advertising
The game is free thanks to advertising (Google AdMob). In Europe, a form asks for your consent the first time you open the app; you can change it at any time in Settings → “My ad choices”. Google may use your device’s advertising identifier according to its policies. On iPhone, Apple also asks for your consent.
Notifications
Eliz’s messages (7:42 am, and 2:47 am if you accept them) are scheduled on your phone, without any outside service. You can turn off the night ones in Settings.
If you are not feeling well
This is fiction. If a message suggests real distress, the game steps out of the story and suggests the 3114 (suicide prevention in France, free, 24/7) and the 3919 (domestic violence in France). Outside France, please contact your local emergency number.
Age
This game is for players aged 16 and over.
Your rights
To delete your game data: uninstall the app (the anonymous identifier disappears) or write to us using the contact form on bykrystaa.studio, giving the code shown in Settings. You can also contact the CNIL (the French data protection authority).