Database-to-calendar sync
Connect selected Notion databases to iCloud Calendar, with a separate calendar created for each database.
Calnio
Calnio syncs dates from selected Notion databases to iCloud Calendar as editable Apple Calendar events, with optional two-way updates back to Notion. It is designed for people who manage tasks, deadlines, or other dated Notion records and want them available across Apple devices.
Notion dates in Apple Calendar
Calnio is a hosted synchronization service that puts dates from selected Notion databases into iCloud Calendar. The resulting items are ordinary Apple Calendar events, so they appear on iPhone, iPad, Mac, Apple Watch, and iCloud.com rather than requiring a separate calendar app.
The service supports one-way Notion-to-calendar syncing by default and optional two-way editing for each sync. A Notion date can become an all-day or timed event, and calendar edits can be sent back to Notion when two-way mode is enabled. Calnio is designed for people who manage tasks, deadlines, meetings, or other dated database entries in Notion but want to see them in Apple Calendar.
Key features
Date-aware event conversion
A date without a time becomes an all-day event, while timed dates and date ranges are represented with their corresponding timing.
Automatic updates
Notion changes to titles, dates, and trashed or cleared-date pages are reflected in Apple Calendar on the next sync run.
Optional two-way editing
When enabled for a sync, calendar edits can rename pages, move their dates, trash pages, or create new Notion pages from newly created events.
Native iCloud events
Calnio uses iCloud Calendar events rather than a read-only webcal subscription, so events can use normal Apple Calendar alerts and appear across Apple devices.
Limited data handling
The service stores sync metadata and credentials needed for operation, but not the content of synced Notion pages; Notion and iCloud credentials are encrypted before storage.
Use cases
Personal task planning
Keep Notion due dates visible in the iPhone Calendar app, where they can use the alert settings already configured for Apple Calendar.
Project and deadline tracking
Turn Notion deadlines, appointments, or dated project records into separate iCloud calendars that can be shown, hidden, colored, or shared like other calendars.
Calendar-first task updates
Use Apple Calendar as the editing surface while retaining Notion as the database: move or rename an event, or delete it, and the corresponding Notion page is updated when two-way sync is on.
Adding Notion items from Apple Calendar
Create an event in a calendar assigned to one sync and have a new page added to the connected Notion database, subject to Calnio’s two-way import rules.
Pros and Cons
Pros
- Free to use, with no paid plan, trial, or card requirement.
- Hosted setup requires no software installation.
- Creates editable iCloud events with normal Apple Calendar alerts and cross-device availability.
- Optional two-way sync can update Notion from calendar edits.
- The service limits Notion access to pages and databases the user explicitly shares.
Cons
- It supports iCloud Calendar only, not Google Calendar or Outlook.
- Repeating events and invitations with other attendees are not imported.
- Two-way event creation has constraints: only events created after two-way is enabled are imported, and the calendar must belong to a single sync.
FAQ
Is Calnio free?
Yes. Calnio has no paid plan, trial, or card requirement. It is hosted by the developer and available at no charge.
What is required to set up Calnio?
You need a Notion database with a date column, a Google account for sign-in, and an Apple Account with two-factor authentication so you can create an app-specific password for iCloud Calendar. Setup involves signing in, sharing databases with Calnio, connecting iCloud, and selecting the databases to sync.
What does Calnio create in Apple Calendar?
Notion dates are written to iCloud Calendar as ordinary events. A date without a time becomes an all-day event; a timed date becomes an event at that time, usually lasting one hour unless the Notion date includes an end time. Each database gets its own calendar unless you select another existing calendar.
How often does Calnio sync?
Notion-to-Apple Calendar syncing runs automatically, with checks every 15 minutes. The first sync starts immediately after adding a database or enabling a sync.
Does Calnio work with Google Calendar or Outlook?
No. Calnio writes to iCloud Calendar, which is displayed by Apple Calendar on iPhone, iPad, Mac, Apple Watch, and iCloud.com. It does not support Google Calendar or Outlook.
Quick Facts
- Category
- Productivity
- Primary integration
- Notion and iCloud Calendar
- Apple platforms
- iPhone, iPad, Mac, Apple Watch, and iCloud.com
- Sync interval
- Every 15 minutes; initial sync starts immediately
- Setup
- Hosted web service; nothing to install
- Sign-in and access
- Google sign-in, selected Notion pages or databases, and an iCloud app-specific password
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