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.
Free · works offline · installs like an app · nothing to sign up for.
What it does
Made for keeping people safe
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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.
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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.
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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.
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Share with a carer
Invite a partner or carer to a person by scanning a QR code. Both devices stay in sync, live.
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Reuse medicines
Copy a medicine’s definition from one person to another — set it up once, use it everywhere.
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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
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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.
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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.
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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.
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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
Stores & relays encrypted blobs. Fans out live updates. Cannot decrypt anything.
Why it’s different
Private by design
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End-to-end encrypted
Encryption and decryption happen only on your devices. Plaintext never leaves the device.
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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.
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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.
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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.
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Standard, modern crypto
libsodium primitives (XChaCha20-Poly1305, BLAKE2b) and BIP39 phrases. No custom cryptography.
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Works offline
A PWA with a local encrypted cache — it works without a connection and syncs when it's back.
Start using Next Dose
No sign-up, no email, no password. Open it and go — your data is encrypted before it leaves your device.