Kalend Support

1. Check both devices are signed in to the same iCloud account: Settings → your name.
2. Check iCloud Drive is on: Settings → your name → iCloud → iCloud Drive.
3. Check Kalend is allowed to use iCloud in that same list.
4. Make sure both devices have a network connection and open the app on each — sync happens in the background but a foreground launch prompts it immediately.
5. Give it a minute. Apple's sync service batches changes and is not instant.

Yes. If you are not signed in to iCloud, or you turn iCloud off for Kalend, the app keeps working normally on that device — you simply do not get sync between devices. Nothing is lost.

On your device, and — if iCloud is enabled — in your own private iCloud database. There is no Kalend server. We cannot see your data, which also means we cannot recover it for you. See the privacy policy.

Showing your calendar events is off until you turn it on: in Kalend, open Settings (the gear) → Calendars → Show my calendar events. If it is on and events still do not appear, check Settings → Privacy & Security → Calendars → Kalend is set to Full Access.

Only to show your real events beside the tasks due that day, and only if you turn it on. Kalend never asks on its own. Your events are read live from your own calendars each time they are shown and are never copied into Kalend's storage or uploaded anywhere.

Yes. Appointments you add with the + on the Calendar tab are Kalend's own — they sync through your iCloud with the rest of your data and need no calendar permission at all.

A cushion. With one grace day (the default) you can miss a required day without losing your streak; miss two in a row and the streak ends. Showing up again earns the grace back. You can set it between 0 and 3 days in a row when editing a habit. It exists because research on habit formation found that missing one opportunity does not meaningfully set you back, so an app that punishes it is working against you.

Because that is what it is measuring. A habit done a set number of times per week is judged per week, so its streak counts consecutive successful weeks. A daily habit counts days.

The "21 days" figure is a myth with no supporting evidence. Lally and colleagues (2010) actually measured how long it takes a behaviour to become automatic and found a median of 66 days, ranging from 18 to 254 depending on the person and the habit. Kalend shows progress toward 66.

Yes. Open the habit and tap the day in its History calendar. Streaks are recalculated from your completion history, so correcting the past corrects the streak.

iOS allows an app a maximum of 64 pending notifications at once — a hard system limit with no way around it. Kalend keeps a rolling window of the soonest reminders and refreshes it every time you open the app, so if you set a very large number of far-future reminders, the distant ones are scheduled later rather than immediately. Opening the app periodically keeps the window topped up. Habit reminders are not affected: they repeat on their own and never run out.

Settings → Notifications → Kalend → Allow Notifications.

No. Every feature is free, with no subscription and no ads. The coffee at the top of Settings is an optional tip for the person who makes the app. It unlocks nothing and does not renew.

Tips are processed by Apple, so ask Apple for a refund at reportaproblem.apple.com. Nothing in the app changes either way.

All purchases go through Apple, so refunds are handled by Apple at reportaproblem.apple.com. We are not able to issue them directly.

Delete the app from your device, then remove its iCloud data in Settings → your name → iCloud → Manage Account Storage → Kalend. That erases everything the app has created. Because we hold no copy, nothing remains anywhere else.