Blunderbook

Support.

Tell us what happened and we will help you get back to your games.

Contact the developer

Include your iPhone model, iOS version, the Chess.com or Lichess username involved, and a short description of what you were doing when the problem occurred. If a particular game is affected, a link to it helps. Do not include passwords, payment card details or other sensitive information.

Email support

Subscription

Premium is billed through your Apple Account. To cancel or change it, open Settings on your iPhone, tap your name, then Subscriptions. If Premium is missing on a new device, open the Plan screen in the app and tap Restore purchases. For refunds, use Apple’s Report a Problem.