Best time blocking apps: 5 planning models compared

Published September 25, 2026 · Updated October 22, 2026 by Drifta

Drifta is an iPhone task app for ADHD that gives every task its own time window.

Best time blocking apps, ranked by planning model

1. Sorted 3: best for combining tasks, calendar events, and notes in one daily timeline.
2. Sunsama: best for a guided morning review that brings tasks and calendar events together.
3. Motion: best when automated scheduling and task prioritization are the main requirement.
4. Google Calendar: best for fixed events and manual time blocks in a calendar you already use.
5. Drifta: best when flexible tasks need a time window rather than one fixed block.

A calendar slot and a task's allowed timing are different. Motion supports an earliest start date and a deadline while scheduling tasks into calendar blocks; those boundaries are not unique to Drifta. Sunsama places a task on the calendar when you timebox it. Choose whether you want assigned calendar slots or task-window tracking as your primary view, and compare time windows versus due dates for the underlying distinction.

Google Calendar is a calendar app that can be used for time blocking by dragging tasks into open slots, though it was not built to track a task's earliest start time separately from its deadline.

How to set up time blocking in Google Calendar

These steps use ordinary calendar events as task blocks, the same manual event-and-drag approach described throughout this comparison.

1. Open the day or week you want to plan and leave every fixed meeting or appointment where it already belongs.
2. Create an event in an open slot for one task, and name the event for the action you plan to take.
3. Set the event's start and end to the amount of time you can realistically protect for that task.
4. Repeat for the few tasks that matter most, leaving open space between blocks for transitions and interruptions.
5. When the day changes, drag the affected task blocks to new open slots instead of stacking them on top of fixed events.

The method is simple: you treat each task event like a meeting and protect its slot. That works while the day holds, but every moved block still remembers only the new slot, not the task's original earliest start or real deadline.

Where the blocks hold up

For a day that is mostly fixed, meetings, a doctor's appointment, a call at a set hour, dragging tasks into the remaining gaps works reasonably well. The calendar already shows what is taken, so a task dropped into what is left is unlikely to double-book anything. It is also visible to anyone who shares your calendar, which matters if a partner or coworker needs to see when you are unavailable.

Where fixed calendar blocks break down for ADHD

A fixed block turns a flexible task into an appointment with yourself. When attention shifts, a meeting runs long, or the first task takes more time than expected, every later block has to move by hand. Google Calendar remembers where you moved the event, but not that the task could start anytime after lunch and only needs to be done by Friday, so the useful range disappears.

This gets worse once you count the cost of the interruption itself. In a widely cited 2008 study, Gloria Mark, an informatics professor at UC Irvine, found it takes about 23 minutes on average to fully return to a task after being pulled away from it. A calendar full of tightly packed blocks assumes zero recovery time between them, which is rarely how an actual day behaves.

Say Monday's plan blocks 9am to 10am for "write the proposal outline" and 10am to 10:30am for "reply to invoices." A call runs long and eats until 9:40am. The outline block is now twenty minutes shorter, the invoice block still starts at 10am because that is where it was dragged, and there is no record anywhere in the calendar that the outline actually had until Wednesday to get done. Everything after the call feels rushed, not because the day had too much in it, but because the one piece of information that would have said "this can wait" was never stored on the block in the first place.

Todoist and other task apps: same gap, different app

Todoist and similar task apps let you sync tasks into a calendar-style view, which looks like a fix but usually is not one. The task still gets represented as a slot at a specific hour rather than as a range with a real earliest start and a real deadline. Moving the slot later is easy; recovering the information about how much true slack the task had is not, because that information was never stored separately from the slot in the first place.

Google Calendar vs. Drifta

A split system that keeps the calendar for what it's good at

The practical fix is to give each tool the job it is actually good at. Real events with another person attached stay on the calendar. Flexible tasks move to a list that can hold both ends of their real timing, not just one dragged hour. This is the specific gap Drifta is built around: a task can carry an earliest start time, a deadline, or both, and it stays quiet until its window opens rather than firing at whatever hour it happened to land on. A task marked non-negotiable can keep re-reminding every five minutes until it is done, which covers the rare task that genuinely cannot slip, without treating every task that way by default. For more on picking between a due date and a full window, see time windows versus due dates, and for why classic time blocking specifically struggles with ADHD estimation, see time blocking with ADHD.

Is a time blocking calendar enough for ADHD?

For fixed events, yes. A calendar holds a meeting or appointment well. For flexible tasks, a calendar block has no record of the task's earliest start or deadline, so it has to be dragged again whenever the day shifts. A task app that stores a time window for each task covers that gap. Why calendars alone fail for ADHD tasks goes through the pairing in more detail.

A one week test

Keep Google Calendar exactly as it is for anything with a fixed hour and another person attached. For everything else, the loose, solo, movable tasks, write down an honest earliest start time and a real deadline instead of dragging them into whatever gap looks open. After a week, look at which list actually survived contact with an interrupted Tuesday: the calendar full of moved blocks, or the list that still knew each task's real range. For more on why a bare calendar under-represents time blindness in the first place, see what time blindness feels like and ways to make time visible.

This article shares practical organizing ideas. It is not medical advice. For diagnosis or treatment questions, talk with a qualified clinician.