Track medication doses. No accounts.

Never lose track of a dose.

Track medications for yourself or the people you care for. Log a dose with one tap and Next Dose works out what’s due and when — private by default, encrypted end to end.

No accounts End-to-end encrypted Open source

Open the app How it works

Free · works offline · installs like an app · nothing to sign up for.

A person you track, with what’s due next

What it does

Made for keeping people safe

Take now, in one tap

Log a dose the moment you give it. The dose history is the source of truth, so “what’s next” is always calculated, never guessed.
Everyone you care for

Track yourself, a partner, kids or ageing parents. Each person is their own private space you can keep solo or share.
Intervals & period caps

Set a minimum interval and a max per period. Next Dose shows what’s safe to take now and what’s still on cooldown.
Share with a carer

Invite a partner or carer to a person by scanning a QR code. Both devices stay in sync, live.
Reuse medicines

Copy a medicine’s definition from one person to another — set it up once, use it everywhere.
You decide who’s in

The person who sets someone up owns their space — add a carer, share ownership, or remove access. Remove someone and the space re-keys itself, so they see nothing new.
All your devices

Set up a new phone or tablet by scanning a code or entering your phrase. Changes made offline catch up automatically the moment you reconnect.
Private by design

No account, no email, no password. Everything is encrypted on your device before it syncs, and it works offline.

How it works

Encrypted, without accounts

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

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 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

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.

Security

Even the sync server can’t read it

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 dose, encrypted

Blind sync server

Stores & relays encrypted blobs. Fans out live updates. Cannot decrypt anything.

The server only ever sees ciphertext and random-looking identifiers — never a key, a name, or a person.

How the encryption works →

Why it’s different

Private by design

End-to-end encrypted

Encryption and decryption happen only on your devices. Plaintext never leaves the device.
The server is blind

It's untrusted infrastructure by design: it stores and relays ciphertext and never holds a key. Compromising the server leaks nothing readable.
No accounts, nothing to breach

No email, no password, no profile. There's no user database to leak — just anonymous encrypted blobs keyed by hashes.
Open source

The apps, the encryption core, and the server are all public. Inspect the crypto or self-host the server — you don't have to take our word for it.
Standard, modern crypto

libsodium primitives (XChaCha20-Poly1305, BLAKE2b) and BIP39 phrases. No custom cryptography.
Works offline

A PWA with a local encrypted cache — it works without a connection and syncs when it's back.

The Mycelium

One private foundation, a family of apps

The Mycelium is a small family of apps that all share the same promise — no accounts, end-to-end encrypted, and open source. Set up once and the same private identity works across every one of them.