CalDelta

Does your wife put things in the shared calendar, forget to tell you, then blame you for not knowing?Well now you have no excuse.You're welcome!

Free · iPhone · No account · iOS 17 or later

CalDelta showing calendar entries added in the last 24 hours, and one removed in the last 7 days.
01 / What it does

The difference, not the diary.

A shared calendar changes under you all day: a meeting moves, an event is cancelled, something new appears next Tuesday. Your calendar app shows you what is there now, never what is different. CalDelta shows you only what changed.

It watches the calendars you choose and keeps a private record of what it has seen. Anything added or removed since then shows up in a list, grouped by how recently it happened.

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Events added to any calendar you watch, with the full detail: time, place, notes and which calendar it landed in.

Events removed: still described in full, because CalDelta remembers them even after the calendar has forgotten.

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One notification a day, at a time you choose, and only when something actually changed. Nothing changed, nothing arrives.

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Accounts to create, subscriptions to cancel, adverts to close. It reads the calendars already on your phone.

02 / On screen

A short list, and nothing else.

The CalDelta changes list: added events marked with a coloured dot, a removed
                  event struck through in red, each with its time, place and calendar.
What changedAdded events in full, removed ones struck through, and which calendar each came from.
The same list scrolled down, showing the Last 7 days and Last 30 days groups.
Grouped by recencyThe last 24 hours, then 7 days, then 30 days, so today's surprises stay at the top.
CalDelta settings: a list of calendars to watch and a daily digest time of 19:00.
Your calendars, your timeWatch all of them or just some, and pick when the one daily notification arrives.
03 / Privacy

Your calendar never leaves your phone.

Every comparison happens on the device. No event title, time, location, guest or note is ever sent anywhere: there is no server holding your diary, because there is nothing on a server to hold.

The one thing that does leave the phone is an anonymous push token and the time of day you picked, so a scheduler knows when to wake the app up. That token identifies a copy of an app, not a person. There are no accounts, no analytics and no advertising. The full detail is in the privacy policy.