MerryBloodA local tracker for Mac, iPad & iPhone
Your bloodwork. On your device. Nowhere else.
Track every lab value over time, see it against its healthy range, and keep the whole history on your own machine.
macOS, iPad, and iPhone · one-time purchase · no account required
Two markers, one chart
Overlay any two tests to see how they move together. Sharing a unit? Real values on a common axis. Different units? Each line is normalized to its own range, so you compare the shape of the trend — never a meaningless average across two different things.
In range, high, or low — automatically
Record a value with its date and an optional note; MerryBlood labels it against the reference range on the spot. Group and sort your history by date, test, category, or status — and search by name.
Backups are plain CSV, in a folder you pick
Point MerryBlood at any folder — iCloud Drive, an external disk, wherever — and it writes plain CSV you can open anywhere. One format restores, transfers, and future-proofs everything. Automatic, or on demand.
What it does
Everything you need to follow a number over time
- Define your own tests — name, unit, reference range, colour, and category.
- Record values over time with dates, optional times, and notes.
- Automatic status for every value: in range, high, or low.
- Trend charts per marker, drawn against the healthy-range band.
- Compare two markers on a single, shared chart.
- Group, sort, and search across everything you track.
Why it's different
Built so your data stays yours
Most trackers ask for an account and keep your results on their servers. MerryBlood takes the opposite stance.
Your data never leaves your device
No accounts and no cloud — the app doesn't go online at all. We can't see your results, because they only ever live on your Mac, iPad, or iPhone.
One payment, not a subscription
Buy it once. There's no recurring fee quietly holding your own history hostage.
Plain-CSV backups, no lock-in
Backups are ordinary CSV files you own and can read anywhere. One simple format for backup, restore, and transfer — your data outlives the app.
Track anything, not a preset list
Most apps limit you to the markers they shipped. MerryBlood lets you add any test and any unit yourself, so nothing you measure is off the table.
On the roadmap
A starter file you don't have to use
We're working on a downloadable CSV of the most common tests and their usual units. Import it to set up in seconds — or keep adding your own by hand. Either way it's just a local file on your device; nothing is fetched from a server.
Send feedback
Found a bug or want a feature?
Tell us what's on your mind. The form opens your own email app with everything filled in — nothing is sent through a server.