Sure: we encrypt the private key and store it in local app storage on the device. For deeper info, you may refer to the source code.

I can’t create new account with Primal android app on GrapheneOS. This a known limitation? Button doesn’t react when tapped.

Thank you. But most people can't read code, and those who can have a busy life ;) That's just a simple question, to make clear that Primal Android isn't just a wrapper for Primal web (like Iris Android for example), but an app with secure storage similar to Amethyst. ➡️ A description (more than 1 line) of how #Primal protects the user's key would look good on your GitHub. Encrypted how, using secure element or not, etc. Just my 2 sats.