Plans & limits
Kalender Sync comes in three plans. Current prices are on the pricing page — this page covers what functionally sets the plans apart.
The plans compared
Section titled “The plans compared”| Free | Basic | Professional | |
|---|---|---|---|
| Syncs | 1 (sharing) | 5 | unlimited |
| Connected calendar accounts | 2 | 3 | unlimited |
| Google & Microsoft | ✓ | ✓ | ✓ |
| Apple iCloud, GMX, WEB.DE, mailbox.org, Posteo, STRATO, Disroot & KSuite | — | ✓ | ✓ |
| iCal feeds as a source | — | ✓ | ✓ |
| Sync interval (Google & Microsoft) | real-time (webhook) | real-time (webhook) | real-time (webhook) |
| Sharing direction | one-way only | bidirectional | bidirectional |
| Sync range (ahead) | 6 months | 6 months | 18 months |
| Sync your own calendars (two-way) | — | ✓ | ✓ |
| Keep event colors | — | ✓ | ✓ |
| AI assistant: calendars per access | 1 | 3 | 25 |
| AI assistant: let it create events | ✓ | ✓ | ✓ |
| AI credits per month | 100 | 1,000 | 2,000 |
| Buy extra credits | — | ✓ | ✓ |
| AI assistant: access log | — | 7 days | 90 days + CSV export |
| Subscribe calendars: test mode (sandbox key) | ✓ | ✓ | ✓ |
| Subscribe calendars: public calendars | — | 1 | 10 |
| Subscribe calendars: active subscribers | — | up to 500 | up to 5,000 |
New accounts automatically start with a 7-day trial at full Professional scope.
How counting works
Section titled “How counting works”- A two-way sync (sync your own calendars) counts as one sync — not two.
- A sync with multiple source calendars counts as one sync.
- Paused syncs don’t count against the active limit — resuming checks it, though.
- An iCal feed counts as one calendar account, exactly like a Google, Microsoft or CalDAV account. So on Basic you can have three feeds — or two feeds plus one Google account. If you need more than 3 accounts, the Professional plan with unlimited accounts is the way to go.
What happens at the limit?
Section titled “What happens at the limit?”Nothing dramatic: you simply can’t create additional syncs or accounts until you end/disconnect something or upgrade. Everything existing keeps running — nothing is ever deleted.
Providers not included in your plan appear greyed out with a lock icon in the “Connect calendar” dialog. An upgrade takes effect immediately and unlocks them right away.
Plan notes in these docs
Section titled “Plan notes in these docs”Pages about features that require a specific plan carry a small note at the top (“Available on Basic and up” / “Available on the Professional plan”) with a link to the pricing page — no guessing needed.
AI credits
Section titled “AI credits”The calendar overview (list_calendars), feedback (send_feedback) and all sync tools are free, even with an empty balance. An event search costs 1 credit; an availability query or event write call (create, update, delete, respond) costs 2 credits. Only successfully executed calls are billed.
If the balance is insufficient, the assistant does not perform the chargeable call and receives a notice with the balance, required credits, and next refill date if known. This does not mean your calendar is empty. On Free, you can upgrade; on Basic and above, you can also buy extra credits. See the tool reference for technical details.