No. There's no sign-up, email, or password. The Mycelium 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 data. The two features that reach past your own devices, emailed calendar invites and Voice Notes' transcription, are both off until you set them up, and both are described on the privacy page.

What leaves your devices, and when

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. The Mycelium is free to use — no trial, no paid tier, no ads, and nothing sold on. There's no account and no profile, so there's nothing about you to sell.

Yes. The server is a single small binary, published as the Docker image darktrees/blind-sync. Point the app at your own server URL and your ciphertext syncs through infrastructure you control — the server still can't read any of it.

Server image on Docker Hub

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 spaces 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 shared space 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.

Only in the sense that they're in one list. Every shared space is tagged with the module it belongs to and encrypted under its own key, so a medication space and a loan are as separate as two apps would be. Sharing a family calendar with someone gives them that family and nothing else.

Install The Mycelium and restore with the recovery phrase you already have. Everything you had appears — no export, no import, no migration — because every one of those apps always kept its spaces in the same keystore this app reads. The standalone apps no longer get updates, so once you've moved over you can delete them.

Yes. Your device tells the server when to wake it, and the server sends a content-free push when one is due — the app then decrypts locally and shows the real notification. The server never learns what any reminder is about. If you never grant notification permission, nothing is registered and nothing is sent.

Reminders and email invites, in full

No, and it takes three separate things to be true before a single message is sent: the server has to relay mail at all, the family has to switch invites on (confirming a dialog that says email is not encrypted), and the person has to have an address saved against them.

The transcription and summary services you choose, and nobody else. Each notebook is set up with its own — OpenAI, Anthropic, or a server you run yourself, such as a local Whisper or Ollama. Recordings go from your device straight to those services, never through the sync server, and what the service sends back is encrypted before it is stored. Until a notebook has a service set up, nothing is sent anywhere.

No. It is a shared record between two people who already know each other — how much was lent, what was agreed, what has been paid, and what interest has run. Both sides see the same figures, worked out the same way. It isn't a lender's statement or a credit contract, and it doesn't move any money.

Daily, on what is owed, at the yearly rate divided by 365, and added to the balance once a month on the day the loan started. A 0% loan just counts down. Nothing is stored as interest — every device works it out from the payments and the terms, so a payment recorded late re-prices everything after it, and a rate change applies from the day you choose.

A mycelium is the underground fungal network that connects separate trees and lets them share water and nutrients — no centre, no authority, and the trees remain separate trees. That is exactly the shape of this: one hidden network, seven things that stay themselves.