iCal feed as a source

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Kalender Sync can use any HTTPS-reachable iCal/ICS feed as a source. That brings calendars into the system that have no native integration — and it’s the most important fallback when your organisation blocks OAuth connections (more on that).

Before you start

• Feeds are read-only: Kalender Sync pulls source events from them but cannot write into the feed. As a target calendar you still need a connected account.
• The feed is polled every 5 minutes; the provider’s own caching adds on top (Outlook feeds can update sluggishly).
• The feed URL usually contains a secret (token) — treat it like a password. Kalender Sync stores it encrypted.

Finding your calendar’s secret iCal address

Google Calendar

1. Open Google Calendar on the web → gear icon → Settings.
2. Click the calendar on the left → section “Integrate calendar”.
3. Copy the “Secret address in iCal format”.

The secret (not the public) address shows all events. You can reset it at Google any time if it ever leaks.

Outlook / Microsoft 365

1. Open Outlook on the web → gear icon → Calendar → Shared calendars.
2. Under “Publish a calendar”, pick the calendar and the permission — “Can view all details” if titles & details should transfer, otherwise “Can view when I’m busy”.
3. Copy the ICS link.

The chosen permission determines what’s in the feed — and thereby the maximum Kalender Sync can read. The sync’s visibility level can restrict it further, but never extend it.

Apple iCloud

1. Open the iCloud calendar → share icon next to the calendar.
2. Enable “Public Calendar” and copy the link.
3. No need to change webcal:// — Kalender Sync converts it to https:// automatically.

Adding the feed in Kalender Sync

Paste the feed URL — it's verified immediately on adding.

1. In the dashboard: “Connect calendar” → “iCal Feed (URL)”.
2. Paste the copied URL (HTTPS only; webcal:// is converted automatically).
3. “Test & Add” — Kalender Sync fetches and verifies the feed right away.

The feed is then available as a source in your syncs.

Limits of feeds

• Source only, never target — syncing back into the blocked calendar doesn’t work via feed.
• 5-minute cadence plus provider caching instead of real time.
• An iCal export out of Kalender Sync (your own feed URL to subscribe to) doesn’t exist yet → Known limitations.

Removing a feed

Feeds appear under Settings → “Connected calendars” as a regular calendar card. On deletion, the dialog lists all affected syncs (“Deleting “X” will end N syncs”) and ends them cleanly — the blockers in the target calendars are cleaned up. Details: Removing calendars.