No sign-up, no server that knows who you are. Next Dose is built on four simple ideas — a phrase, a keystore, a key per shared space, and a server that never sees any of it.

1. 1

   One recovery phrase

   On first use, Next Dose generates a 24-word recovery phrase. Those words are your identity — there's no account, username, or password behind them.

2. 2

   The phrase unlocks your keystore

   The phrase derives a master key that encrypts a small personal keystore — the list of shared spaces you belong to and the key for each.

3. 3

   Each shared space has its own key

   A person you track has one group key. Everything in it is stored as documents encrypted with that key. Sharing the space means sharing that one key — via a QR code or invite — and the space's owners decide who's in. Remove someone and the key is rotated and re-shared to everyone who remains, so they see nothing new.

4. 4

   A blind server just relays ciphertext

   Your devices sync through a server that stores and forwards encrypted blobs and pushes live updates. It never holds a key, so it cannot read anything it syncs.

Adding a device or sharing: scan a setup QR from a device you already have, or enter the 24 words — the new device pulls your keystore and you're in. Live sync self-heals: if a device goes offline it catches up on reconnect, so every device ends up showing the same thing.