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Any calendar that shows up in Apple Calendar: iCloud, Google, Microsoft Exchange and Outlook, and other CalDAV accounts. Add accounts in iOS Settings › Apps › Calendar › Calendar Accounts and Horizon sees them too.

Each event goes through these steps in order, and the first one that answers wins:

1. A category you set for that title.
2. A calendar you tagged with a category in Settings › Manage Calendars, plus built-in rules for birthdays and holidays.
3. A keyword match against your categories.
4. Horizon's AI reads the title and picks a category.
5. Your past corrections: if the title resembles events you categorized by hand, it follows those.
6. If none of that is sure enough, a deeper pass runs, and the result shows as a guess with a small question mark until you say Looks Good.

None of it leaves your iPhone or iPad.

Fix one event. Open the event and tap its category, or touch and hold it in the day list and choose Change Category. On a guess, Looks Good keeps it. Quick Categorize, and Review Guesses in Settings › Manage Categories, go through all the guesses in one sitting.

Horizon learns from your fixes. Every category you set is remembered: events with the same title always get your pick, and once you have corrected a handful of similar events, Horizon uses those examples for new events that look alike.

Skip the AI for a category. In Settings › Manage Categories, open a category and add keywords. A title containing one of those words goes straight to that category, no AI involved. The surest way to get every “standup” into Work.

Tie a whole calendar to a category. If a calendar is all one thing, open it in Settings › Manage Calendars and give it a category. Everything on it lands there.

Changed keywords or calendar tags and want older events to follow? Settings › Manage Categories › Recategorize All Events redoes everything except the events you categorized yourself.

Yes. Rename, recolor or change the icon of any category, turn off the ones you don't need, add your own, and edit each category's keywords. You can also set how far ahead Horizon reminds you, per category.

Tap Add Your Own while setting up, or Add Category in Settings › Manage Categories. From Your Calendar suggests words that come up often in your events and that no category catches yet, and Ideas offers a few to start from; a tap fills in the name, icon, color and keyword. Preview lists the events the category would get before you add it. Events you categorized yourself stay where they are unless you choose Move These Too. A keyword in a category you made wins over the same word in a built-in one.

Tap the Free chip at the start of the category bar. The open time between your events shows in the list and on the selected day of the month view; tap an opening to start a new event there. Settings › Free Time sets the hours it covers, the shortest opening worth showing and how long a new event runs. For a longer search, use Find Free Time.

Give a category a goal for the week, at least or at most, counted in events or hours: say at least 3 workouts, or at most 20 hours of Work. Select the category on the dashboard and tap Goal on its header, or open the category in Settings › Manage Categories. The ring fills as the week goes, and the line under it counts what's done and what's still on your calendar. Goals follow through iCloud with your categories.

The event overlaps another one you're going to. Touch and hold it and choose Show Overlaps, or open it and tap the Overlaps row, to see both on the day's timeline. Overlaps count every calendar, even when you're looking at one category. Invitations you haven't answered, events you declined, events marked free and calendars that don't block free time aren't counted.

Yes. In Settings › Manage Calendars, open the calendar and turn off Blocks Free Time. That suits a partner's or the kids' calendar, Birthdays or Holidays. Its events stay on your dashboard and keep their categories, but they no longer block free time, count as overlaps or show as conflicts in your briefings. The setting is per device.

In the Invitations list: open it from the card under the Today card, the Invitations button in the month and week views, the iPad sidebar or your briefings, or ask Siri to “Show my invitations in Horizon”. Tap Reply… under an invitation to answer in Calendar's own reply screen. You can choose how far ahead it looks, include the ones you answered Maybe, combine a recurring invitation into one row, and group by date or by who invited you.

Yes. Turn on Keep Until Answered in Settings › Invitations. Invitations you haven't answered then wait in the Invitations list instead of filling your lists, calendar, briefings, widgets and Apple Watch. Accept or answer Maybe and the event joins the rest of your calendar. One you never answer shows again once it's over, so nothing disappears from your history. The same page decides whether unanswered invitations block your free time.

Events that cover a whole day, such as birthdays, holidays and the middle days of a trip, sit in a strip of chips above each day's events, so what you have to get to comes first. Tap a chip to open it, as you would a row. Past four (eight on iPad) the rest wait behind “More”. A day's count leaves them out: “7 events today” means seven you go to.

In the calendar, turn your iPhone sideways. On iPad, choose Week in the calendar header, or press Cmd+3. Choose a category to highlight its events against the rest of your week, and tap an empty hour to add an event.

Tap Edit on an event to open Apple's own editor, where you can move it to another calendar, invite people, set alerts and change how it repeats. Horizon updates when you save.

New events start in Horizon's form, which categorizes the title as you type and has Find Free Time beside the date and time. Deleting from Horizon shows Undo.

Turn on Settings › Reminders and choose your lists. Each day then lists its reminders among its events, in the same categories, and they stay in Reminders on every device. It's optional, and you can turn it off at any time.

Yes. Quick Add understands natural language: type “Lunch with Priya Friday at noon” and Horizon fills in the day and time. Start with “remind me to” for a reminder. It's in the + menu, on ⌘K on iPad, in Control Center and in Siri.

Touch and hold an event until it lifts, then drag it to a new time or day. Move Event… in its menu offers your next openings. Moving one event offers Undo.

Events you want to keep an eye on, each with a countdown. Watch an event from the Watch button under its title, or from a row's menu. A watched event gets a Live Activity on the Lock Screen and in the Dynamic Island for the four hours before it starts, and appears in the Watchlist widget and on Apple Watch.

Touch and hold the Home Screen or Lock Screen, tap Edit, then Add Widget and search for Horizon. There are Upcoming Events, Briefing, Reminders, Watchlist and Life Patterns widgets; Settings › Widgets lists what each one shows. For Control Center, open it, tap +, then Add a Control: Horizon offers New Event, Find Free Time, Watchlist and Daily Briefing, which also work on the Action button.

Try “What's on my Horizon today”, “When am I free this week in Horizon”, “What's my next Travel event in Horizon”, “Add an event to Horizon”, “Watch an event in Horizon” or “Show my invitations in Horizon”. All nine Horizon actions are in the Shortcuts app with no setup.

Your events already sync through Apple Calendar. With Use iCloud on (the default), your categories (with their weekly goals), the events you categorized yourself, most settings and the Watchlist follow you through your private iCloud account. Settings › iCloud lists what follows you and what stays on this device. Turn Use iCloud off there; Horizon asks you to reopen it for the change to apply.

Its home holds your day: what's happening now or next, how much is committed, and what needs you on your iPhone (replies, events to categorize, conflicts). Today shows the day's timeline, and the Watchlist counts down to what you're watching. It's all sent from Horizon on your iPhone, so keep Horizon installed there too.

Yes. Closed, your day fits the cover display with Horizon's controls down the side. Open, Horizon becomes a planner, with your month or week beside the day and an event's details beside those. Fold it like a book and the calendar and the details each get a page.

The same event can live on two calendars, say a meeting on both your work and personal accounts, or a hotel stay booked through a travel app and the one you added yourself. With Settings › Merge Duplicates on, Horizon spots these and shows them as one event. Open it to see every copy under Merged Copies and why they merged, or tap Show Separately to split them.

No. Horizon has no server and no account, and uses no analytics or ads. The only things that leave your device are what Horizon keeps in your own iCloud account and weather and map lookups to Apple. The privacy policy has the details.