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Write the way you'd text a friend: “tomorrow 3pm dentist”, “next fri 7pm team dinner”, “sat 2-4pm dentist”, “every week 3pm standup”, “daily 8am gym”. zerocal understands dates, times, time ranges and simple repeats in English and Korean. The words it understood are highlighted, and the date, time and repeat buttons below the input show the result — tap any of them to adjust before adding.

Tap the mic and speak. Your words appear as you talk and go through the same engine as typed sentences. English and Korean are detected automatically. Voice needs Microphone and Speech Recognition permission; speech recognition is provided by Apple.

Yes. Add the account to your iPhone (Settings › Apps › Calendar › Calendar Accounts), then allow calendar access when zerocal asks. Those events appear alongside yours, and you can choose which calendars to show.

In zerocal on your device by default. To save to a connected calendar instead, change the default in zerocal Settings › New Event › Save To, or pick a destination for a single event from the Save To menu on the new-event screen.

To keep your calendars safe, zerocal doesn't change events that have guests, invitations you received, or events in subscribed, birthday or delegated calendars. It also locks repeat rules it can't reproduce exactly (for example every other week, “until 10 times”, or “second Tuesday of the month”) rather than overwrite them. zerocal shows the reason and opens the event in the Calendar app for you.

Events stored in zerocal live only on the device. Before switching, save them to an iCloud or Google calendar (set Save To accordingly) or export them as an .ics file. Events already in a connected calendar move with that account.

Pro is tied to your Apple ID. On a new device, sign in with the same Apple ID and tap Restore Purchases in zerocal Settings. To cancel a yearly plan, go to iPhone Settings › your name › Subscriptions.

No. There is no account and no server, and sentences are interpreted on your iPhone. See the privacy policy.