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Dayslot · Mac, iPhone and iPad · in testing

Your reminders, on a clock that learns how long things really take you.

Dayslot plans your day from Apple Reminders. Drag a reminder onto your day, start its timer, mark it done. Every finished task teaches Dayslot your real durations, and the time you actually worked lands in your calendar next to your meetings. No new list, no import, no account.

Request test accessHow it works
Today5h 10m planned
  • Review the client proposalEstimated 30 min · took 47 min
  • Answer the quotesEstimated 20 min · took 18 min
  • Prepare the team updateRunning · 12 min of 45 minTimer

Your usual multiplier

×1.4 over your last 12 tasks

An illustration of the Today screen.

Why your days always run over

It is not a lack of discipline. People underestimate how long tasks take, even when they know the last ones ran over. In the study that named the bias, students expected to finish their thesis in 33.9 days; it took them 55.5, and fewer than a third finished within their own estimate (Buehler 1994).

What corrects the estimate is seeing how long a comparable task really took: showing people the duration of a practice run makes their next predictions more accurate (Roy 2008). Dayslot remembers it for you. You log nothing by hand: the timer measures, and the next estimate takes it into account.

How it works

Reminders stays your list

Siri, Apple Watch, shared lists, Mail: everything that already writes to Reminders feeds Dayslot. Nothing to import.

Drag, and the day builds itself

Drop reminders onto the day or the week, as blocks written to your calendar.

Estimates from your own history

Estimated 30 minutes, took 47: from the first finished task. After five, your usual multiplier.

The calendar says what happened

The time you actually worked lands next to your meetings, a record you can scroll back through.

Several timers at once

Because real work is interleaved, each reminder keeps its own.

Overruns without blame

No red, no alarm. One calm line: “this kind of task usually takes you 40 minutes”.

What Dayslot is not

  • A new to-do list: Reminders stays yours.
  • A subscription: one purchase planned for Mac, iPhone and iPad.
  • Another account: your tasks, plan and times stay with you, in iCloud.
  • A method you must follow: no “25 minutes then 5”, which no study established. You work at your pace; Dayslot measures.

Test Dayslot

Dayslot is in free testing. You need a Mac on macOS 26, or an iPhone or iPad on iOS 26, and your tasks in Reminders. Leave your first name and email: we send the steps right away, then your TestFlight invitation as soon as a spot is ready.

Your email is used to send the invitation and the steps, then to hear your feedback during the test. Nothing else, and you can ask to be removed at any time.

What we ask of you: use it on real days for two weeks, and tell us whether the estimate ends up right, what gets in the way, and what you would miss if it disappeared.

Questions

Does Dayslot replace Apple Reminders?

No. Reminders stays your list. Everything that already writes to Reminders, Siri, Apple Watch, shared family lists, Mail, other apps, shows up in Dayslot with nothing to import. A reminder you create or edit in Dayslot is written to Reminders.

How does Dayslot learn how long things take me?

Start a reminder's timer when you begin and mark it done when you finish. From the first finished task Dayslot shows the estimate against the actual, for example estimated 30 minutes, took 47. After five finished tasks it shows your usual multiplier, with the number of tasks it rests on, and pre-fills new estimates from it.

What does Dayslot write to my calendar?

Your planned blocks, and the time you actually worked, in a Dayslot calendar next to your meetings. The plan says what you meant to do; the record says what happened.

Can I run several timers at once?

Yes. Real work is interleaved: a build running while you answer email, a call while a document renders. Each reminder keeps its own timer.

Do I need an account?

No. Your tasks stay in Reminders and your time in Calendar, and your devices stay in step through the iCloud sync you already use. We never receive your tasks, your plan or your times.

Which devices does Dayslot run on?

Mac on macOS 26, iPhone and iPad on iOS 26 or later.

How much will Dayslot cost?

Testing is free. At launch the plan is a free download with a 14-day trial, then one purchase that unlocks Mac, iPhone and iPad, with Family Sharing. No subscription.

Is Dayslot made for ADHD?

It is made for anyone whose days never fit the plan because tasks take longer than expected, which many people with ADHD describe as time blindness. Overruns are shown calmly, with no red and no alarm, as information about how long that kind of task takes you. Dayslot makes no medical claim.

Sources

  1. Buehler R, Griffin D, Ross M. Exploring the planning fallacy: why people underestimate their task completion times. Journal of Personality and Social Psychology, 1994;67(3):366-381. DOI
  2. Roy MM, Mitten ST, Christenfeld NJS. Correcting memory improves accuracy of predicted task duration. Journal of Experimental Psychology: Applied, 2008;14(3):266-275. DOI