Plain Chess is published by Cerebra Enterprises LLC ("Cerebra Enterprises," "we," "us," or "our").
What Plain Chess is
Plain Chess is an offline-first chess app for iPhone. The core app works without creating an account.
Information stored on your device
- saved game state;
- settings and preferences;
- remaining AI credit balance; and
- limited app state used for the review and feedback flow.
Optional AI Coach requests
AI Coach is optional. Before your first AI Coach request, Plain Chess shows an in-app notice explaining what is sent and asks you to continue only if you agree.
If you choose to use AI Coach, the app sends only the information needed to answer your request to Cerebra's secure AI backend, which uses third-party infrastructure and AI service providers to generate the coach response.
- your question or prompt;
- the current board state, such as FEN and PGN;
- the legal move list;
- the recommended move;
- whose turn it is;
- move count; and
- whether the game is against the computer or another person on the same device.
Please do not include personal information in AI Coach prompts. AI-generated responses can be incomplete, inaccurate, or mistaken.
Service providers
We use trusted infrastructure and AI service providers to host, secure, and generate AI Coach responses. These providers process information only to help us operate and provide the app and related services.
Technical logs
Our AI Coach infrastructure may temporarily process limited technical metadata such as IP address, timestamps, and error logs needed to secure and operate the service.
Purchases
Paid downloads and optional AI credit purchases are processed by Apple through the App Store and StoreKit. We do not receive your full payment card number.
What we do not do
- We do not require an account for the core app.
- We do not serve third-party ads in the app.
- We do not sell personal information.
- We do not build advertising profiles from your games or prompts.
- We do not ask you to enter personal information into AI Coach.
Data retention
Saved games and settings remain on your device until you remove the app or clear them through normal app use. AI Coach request data and technical logs may be retained only as reasonably necessary to operate, secure, and troubleshoot the service.
Related documents
You can also review the support page and Terms of Use.
Contact
Cerebra Enterprises LLC
5000 Thayer Center Ste C
Oakland, MD 21550
Email: corporate@cerebraenterprises.com