Know yourself, one datum at a time.
Datums is a private, all-in-one place to log your life: moods, habits, todos, money, time, notes, and anything else you can think of. Every entry is just a few tags, so it all fits together.
Free · No account needed · Works offline
- mood7energy6
- todoWater the plants
- coffee
- $-12.40lunch
- habitmorning walk
- sleep (hours)7.5
- noteA quiet Sunday.
Everything is a datum
A datum is a moment in time with one or more “tags”. A tag is a label with an optional value.
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mood7
Log it
Type a tag, add a value, press Enter. Datums remembers your tags, so most entries take a couple of taps.
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todoCall a friend
See it
“Views” understand certain tags: to-do items show up in Todos, habits in Habits, money in Finances, and events in Calendar.
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sleep (hours)7.5
Learn from it
Analysis charts any tag over time, and shows how two of them move together, like your sleep and your mood.
One log, many views
The same entries, shown the way that suits them. Make a datum in any view and it shows up everywhere it belongs.
Datums
Every entry, newest first, filterable.
Today
Today's habits, todos, events, and check-ins.
Todos
Tasks with priorities, ticked off when done.
Habits
Daily habits, checked off, with streaks.
Timers
Time anything, start to stop.
Timeline
Your days, hour by hour.
Calendar
Events, and everything else, by date.
Finances
Spending and income, by category.
Notes
Longer thoughts, with titles.
Tags
Every tag you use: how often, and how lately.
Analysis
Charts and patterns for any tag.
Private by design
What you log is about you, so it stays with you.
On your device
Everything is stored, encrypted, in your own browser, not on someone else's server.
No account, no tracking
No sign-up, no ads, no analytics. Open it and start.
Works offline
Install it on your phone or computer, and it works anywhere, signal or not.
Yours to keep
Export everything as a CSV file any time, and import it back whenever you like.
Sync, if you want it
Sync across your devices is optional, and end-to-end encrypted with a passphrase only you know.
Pricing
Datums is free. Syncing between your devices is the only paid part.
Datums
Free
- Every view and feature
- As many datums as you like, on this device
- Works offline, installs like an app
- Export and import any time
Datums Sync
$5 a month
or $50 a year, two months free
- Everything in Datums
- Your datums on all your devices
- End-to-end encrypted with your own passphrase
- Free for 30 days, no card needed
Prices are in US dollars, plus sales tax or VAT where it applies. Cancel any time. Payments are handled by Paddle, our reseller. See the terms and refund policy.
Start with your first datum.
It takes a few seconds, or you can begin with a guided tour.