Oncelet

When was the last time?

Oncelet is a days-since board for the things you only do now and then. Tap once when you do one, and it counts from there.

Coming sooniPhone and iPad, iOS 18 or later

This board works. Press a yellow button.

days

Haircut

Sep 18, 11:30 AM

days

Bike chain lubrication

Aug 31

days

Call with parents

Oct 5

The rest waits in a list.

Pin up to four things to the board. Everything else sits below, longest ago first.

Not sure what to count? The app comes with 48 suggestions, such as

kettle descaling, freezer defrosting, toothbrush replacement, eye exam, litter change, plant repotting, oil change, backup, subscription review, watch service.

  • Dentist visitNo entries yet
  • daysTire checkAug 8
  • daysWater filter replacementSep 29, 7:40 PM
  • daysPlant wateringOct 6
  • minBed linen changeToday, 6:22 PM
Oncelet on an iPhone: three pinned plates showing 12 days, 41 days and 0, category filters and the list below
Home on an iPhone, with three things pinned.

One tap, and it starts over.

Press the yellow button on a plate, in the list or on a widget. The cards flip back to zero and the count begins again.

Tapped the wrong one? Undo waits at the bottom of the screen for a few seconds.

Forgot to log it on the day? Add a past entry with the right date. The time is optional.

Plant watering

days · Oct 6

Bed linen change

min · Today

The medium widget. Its buttons record straight from the Home Screen.

After four entries, it knows your usual.

Every thing keeps its own history, with a note when you want one. From the fourth entry Oncelet works out how long you usually go between times.

It is an observation, nothing more. There are no streaks to protect and nothing turns red when you are late. If you would like a nudge, set a reminder on that tracker.

days
Nine haircuts in the last twelve months. Usually about 38 days apart.
A tracker's details in Oncelet: Haircut, usually about 38 days from 11 entries, a Record now button, a reminder and the history for 2026
Details: the count, the usual gap and every entry.

Pick your enamel.

Oncelet comes in eight themes, and each has a night version. The app icon can change to match.

Try one. This page will follow.

Free

Two active trackers, with past entries, categories, reminders, widgets and iCloud sync included. Archived trackers keep their history and do not count.

Oncelet Pro

A one-time purchase, with no subscription. It removes the limit on active trackers and adds more themes, tracker colours and icons.

days

Oncelet on the App Store

No entries yet. Coming soon for iPhone and iPad.

No account, no ads, no analytics.

Entries live on your devices and sync through your own iCloud. The privacy policy has the details.

Recorded Haircut