No. There's no sign-up, email, or password. Next Dose generates a 24-word recovery phrase on first use — that phrase is your whole identity.

No. Everything is encrypted on your device before it's sent. The sync server only ever sees opaque ciphertext, so we — and anyone who runs a server — cannot read your doses.

There is no reset. Because we hold no keys and no account, nobody can recover your data for you. If you lose every device and haven't written the phrase down, the data is gone. Write the phrase down and keep it safe.

Yes. Next Dose is free to use. It's part of an open-source suite you can inspect or self-host.

Yes — the apps, the shared encryption core, and the server are all public. You can read exactly how the cryptography works, or run your own server.

Yes. The server is a single small binary (Docker image provided). Point the app at your own server URL and your ciphertext syncs through infrastructure you control.

Yes. It's a Progressive Web App with a local encrypted cache. It works without a connection and syncs when you're back online.

Scan a setup QR code from a device you already have (or type the 24 words) and the new device pulls your encrypted keystore — the same people appear everywhere. Every device stays live in sync, and one that's been offline automatically catches up the moment it reconnects, so they all end up showing the same thing.

Each shared space has owners and members. Whoever creates a person you track is its owner; they can invite others (a QR code or invite carries just that one space's key), hand co-ownership to someone they trust, or remove a member. An owner can also step down. Ownership is checked cryptographically by the server — which still can't read anything you store.

The space's key is immediately rotated and re-shared to everyone who remains, so the person you removed can't read anything added afterwards. What they already saw while they were in the space isn't clawed back — so removal cuts off future access rather than erasing the past.

No. Next Dose is a tracker, not a medical device or a source of medical advice. Always follow the guidance of a doctor or pharmacist and the medicine’s label.

Next Dose calculates what’s due from each medicine’s interval and your dose history, so you can see at a glance what’s ready and what’s still within its safe period cap.