How it works
One phrase, your whole identity
No sign-up, no server that knows who you are. The Mycelium is built on four simple ideas — a phrase, a keystore, a key per shared space, and a server that never sees any of it. Every module rests on the same four, which is why adding one never needs a new way to sync.
How it works
- 1
One recovery phrase
On first use, The Mycelium generates a 24-word recovery phrase. Those words are your identity — there's no account, username, or password behind them.
- 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
Each shared space has its own key
A shared space 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
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.
And how seven modules fit in one app
Every entry in your keystore is tagged with the module it belongs to — a medication space says it is a medication space, a loan says it is a loan. The app reads the whole keystore, and each tag decides which module’s screens open that space. Nothing else differs between them: the same kind of encrypted documents, under the same kind of key, through the same server.
That is also why the modules stay apart. Each space has its own key, so putting a family calendar and a loan in one list doesn’t put them under one lock, and sharing one of them shares nothing else.
How it fits together
- One recovery phrase 24 BIP39 words derives your master key
- Master key encrypts your keystore the list of spaces you belong to
- Group key encrypts one space's documents every data, encrypted
Stores & relays encrypted blobs. Fans out live updates. Cannot decrypt anything.
What’s inside
The seven things it keeps track of
Each module is a proper app in its own right, with its own screens and its own colour — they just share one install, one list and one recovery phrase. Whatever you keep in The Mycelium, the promise is the same: no account, and nothing a server can read.
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Next Dose Track medication doses for yourself or the people you care for. -
Tally Stick Split shared expenses for trips, housemates or couples. -
Stock Level Know how many days of anything you have left — feed, cereal, kibble. -
Family Manager One shared calendar and to-do list for everyone at home, with reminders that arrive. -
Rep Sheet Log workouts — treadmill, weights, plank, pilates — and watch them add up. -
Voice Notes Record a thought or a meeting, then get a transcript and a summary — and keep the audio. -
Loan Book Keep a straight record of a loan between family or friends: repayments, interest, and what’s still owed.
Start using The Mycelium
No sign-up, no email, no password. Open it and go — your data is encrypted before it leaves your device.