Todomu
A quiet task app for iPhone, iPad and Mac. End-to-end encrypted, shared lists, no sign-up, ever.
Your tasks are encrypted on your device. The server that syncs them only ever holds data it can't read. There's no account, no email address and no phone number: who you are is a key that lives on your device.
The name is “todo” plus mu (無), the Zen “nothing”: the empty list at the end of a day. And todomu (留む) is an old Japanese word for “to keep”.
Coming soon to the App Store.