Calendar 366
Calendar and task app for iPhone, iPad, Apple Watch and Mac
What is Calendar 366?
Calendar 366 is a calendar and task app for Apple devices made by Vincent Miethe, a developer in Berlin. It shows events and tasks from iCloud, Google, Outlook, Microsoft 365, Todoist, Fastmail and CalDAV accounts in one place, takes typed natural-language entries, and adds a menu bar calendar on the Mac. The app is a free download with basic features, and a Pro subscription or one-time purchase unlocks the rest.
Calendar 366 has a free plan. Paid plans start at $19.99 per year for Pro on the App Store. See every plan
Good for
- People who keep everything on Apple devices and want events and tasks in one app
- Mixing iCloud, Google, Microsoft 365, Fastmail and CalDAV accounts
- Buyers who prefer a one-time purchase to a subscription
- Mac users who want to manage their calendar from an AI assistant over MCP
Worth knowing
- Apple only: iPhone, iPad, Apple Watch and Mac. No Android, Windows or web version is listed.
- After the 7-day trial the free download keeps only basic features, and the vendor does not publish which features are premium.
- Prices appear only as App Store in-app purchases. Several have no billing period, and no monthly price for single-user Pro is shown.
- Siri AI is in beta, English only, and needs iOS, iPadOS or macOS 27. The MCP connection to AI assistants is Mac only.
Key features
- Natural language entry
- Type what, when and where to create an event or task, with shorthand such as /Work for a calendar, -r1w for a weekly repeat and ! for priority. Apple Intelligence can be picked as the engine on iOS, iPadOS or macOS 27.
- Tasks next to events
- Tasks sit in the calendar with reminders, location-based alerts, priorities and notes, and can be filtered by today, overdue or important. They sync with Apple Reminders, Google Tasks, Microsoft to-dos and Todoist.
- Views and calendar sets
- Year, month, week, day and agenda views, plus month and week views paired with a list, in portrait and landscape. Calendar sets group calendars and lists and sync across devices.
- Meetings and invitations
- Creates Zoom, Google Meet and Microsoft Teams meetings and opens join links for services such as Webex and FaceTime. Invitations arrive in an inbox and can be accepted or declined there.
- Widgets, Apple Watch and menu bar
- 20 home screen and desktop widgets, 6 lock screen widgets and 10 watch complications. The Watch app creates events and completes tasks, and the Mac version adds a full menu bar calendar.
- Shortcuts, URL scheme and MCP
- Supports Apple Shortcuts and a cal366:// URL scheme for automation. On Mac it can connect to Claude Desktop or LM Studio through the Model Context Protocol to show, create and reschedule entries by chat.
Calendar 366 pricing
- Starts at
- $19.99 per year for Pro on the App Store
- Free plan
- Free download with basic features. The site does not list which features are premium; all of them can be tried for 7 days before choosing a subscription or a one-time purchase.
- Free trial
- 7-day trial of all premium features
| Plan | Price | What you get |
|---|---|---|
| Free | $0 | Free download with basic features. Neither the site nor the App Store listing says which features stay free after the 7-day trial. |
| Pro (Yearly) | $19.99per year | Yearly subscription that unlocks the premium features, as labelled in the App Store's in-app purchase list. |
| Pro (iOS) | $19.99billing basis not shown on the App Store listing | Listed without a period. The vendor's FAQ says a one-time purchase is offered next to the subscriptions. |
| Pro | $49.99billing basis not shown on the App Store listing | Listed without a period or platform label. The site describes the app as a universal purchase across iPhone, iPad, Apple Watch and Mac. |
| Pro Family (Monthly) | $4.99per month, or $29.99 per year as Pro Family (Yearly) | Family version of the Pro subscription, with monthly and yearly options in the App Store's in-app purchase list. |
| Pro Family (iOS) | $29.99billing basis not shown on the App Store listing | Family version listed without a period. A second item named Pro Family, with no platform label, is listed at $69.99. |
Read from apps.apple.com on Oct 9, 2026. Prices change, so confirm with Calendar 366 before you buy.
Ways to pay less
- Lifetime licenseOne-time purchase in place of a subscription
The FAQ on Calendar 366's site says that after the 7-day trial you can choose a subscription or a one-time purchase. The App Store lists Pro (iOS) at $19.99 and Pro at $49.99 without a billing period.
Stated on calendar366.com
Works with
Calendar 366 alternatives
- Calendar 366 vs Fantastical
Free plan · from $4.75/mo
- Calendar 366 vs BusyCal
Free plan · from $49.99 one-time
- Calendar 366 vs Calendars by Readdle
Free plan · from $19.99/yr
- Calendar 366 vs Dato
Free trial · from $18 one-time
Common questions
Is Calendar 366 free?
Calendar 366 has a free plan. Free download with basic features. The site does not list which features are premium; all of them can be tried for 7 days before choosing a subscription or a one-time purchase. Paid plans start at $19.99 per year for Pro on the App Store.
How much does Calendar 366 cost?
Calendar 366 lists 6 plans. Free: $0. Pro (Yearly): $19.99 per year. Pro (iOS): $19.99 billing basis not shown on the App Store listing. Pro: $49.99 billing basis not shown on the App Store listing. Pro Family (Monthly): $4.99 per month, or $29.99 per year as Pro Family (Yearly). Pro Family (iOS): $29.99 billing basis not shown on the App Store listing. Prices were read from apps.apple.com on Oct 9, 2026.
What platforms does Calendar 366 work on?
Calendar 366 is available on iOS and macOS.
Does Calendar 366 offer any discounts?
Calendar 366 publicly lists the following: One-time purchase in place of a subscription.
Does Calendar 366 have an Android app?
No Android app was listed when its pages were read on Oct 9, 2026. Calendar 366 is listed for iOS and macOS.
Does Calendar 366 have a Windows app?
No Windows app was listed when its pages were read on Oct 9, 2026. Calendar 366 is listed for iOS and macOS.
Is Calendar 366 open source?
Calendar 366 is not described as open source on its own site, as read on Oct 9, 2026.
What does Calendar 366 integrate with?
Calendar 366's listing names iCloud, Google Calendar, Outlook, Microsoft 365, Todoist, Zoom, Fastmail and Claude Desktop. A listing names up to eight integrations, so it may connect to more.
Does Calendar 366 have a free trial?
Yes. 7-day trial of all premium features.
Who makes Calendar 366?
Calendar 366 is made by Vincent Miethe.
What are the alternatives to Calendar 366?
The closest alternatives to Calendar 366 in our directory are Fantastical, BusyCal, Calendars by Readdle, Apple Calendar and Dato. Each one has a side-by-side comparison with Calendar 366.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Oct 9, 2026.