Updated 9 November 2026.

How DueSlot works

DueSlot is a web app. You sign in with Microsoft, we create one calendar in your mailbox, and we keep an event for each Planner task that has a due date.

1. Sign in

Use a Microsoft 365 work or school account. DueSlot asks for User.Read, Tasks.Read, Calendars.ReadWrite and offline_access. If your organisation requires admin approval, send your admin the link on the admin page.

2. One calendar

On first sync we create a calendar named Planner (DueSlot) and mark it so we can always recognise it. If you later delete that calendar, we stop and ask you before creating it again. We never write to your other calendars.

3. Events

Each included task becomes an all-day event on its due date (or a timed slot, if you choose that on Pro), marked as free, with the task title as the subject and a link back to Planner. Reminders are off unless you turn them on (Pro).

4. Sync

Free: press Sync now (limited to six times an hour). Pro: a background run about every 30 minutes. Unchanged tasks are skipped using a keyed hash — we don't need to store the title to know whether it changed.

5. Disconnect

You can sign out, or disconnect and delete your DueSlot data. You can also ask us to delete the Planner (DueSlot) calendar at the same time. Revoking the app in Microsoft stops further access.