Plans and limits

Five numbers limit a setup, and they run out at different times. "I'm under the calendar limit but it still won't let me" is a normal thing to hit.

Two kinds of MCP accessCopy Anchor Link

Platform MCP is included on every plan. Manage syncs, connect or reconnect accounts, check activity and health, change preferences and handle support requests through your assistant. Team admins can also invite members, manage invitations, promote or remove members, and manage Team settings and sync policies. Their access does not include members' events.

Calendar Hub MCP is included on Plus, Pro and Team. Browse calendars, read events, find free time, and create, update or delete events on connected writable calendars. It needs no sync, and feeds remain read-only. Free users can discover accounts and available calendars to configure syncs, but cannot read or manage calendar events through MCP.

The browser calendar view remains available on every plan. Its availability does not give a Free MCP connection Calendar Hub permissions. Both kinds of MCP access have a daily request limit and follow the connection's granted permissions. Setup, access and plan changes.

What each word meansCopy Anchor Link

An account is one login: one Google account, one Microsoft account, one iCloud account.

A calendar is one calendar inside an account. Most people have several without realising — Google adds Birthdays and Holidays alongside your main one.

A sync is one rule connecting calendars to each other. A sync can hold more than two calendars: three client calendars pushing into one working calendar is one sync with four calendars in it, not three syncs.

That's what the numbers turn on. The sync count limits how many arrangements you have; the calendar counts limit how big each arrangement gets.

The limit that actually stops peopleCopy Anchor Link

On Free it's the sync count, not the calendars. One sync means one rule, with a single direction and a single set of settings.

So Free handles "keep my work and personal calendars in step" without trouble. What it can't do is two unrelated arrangements at once — personal feeding into work as busy time, and a shared family calendar feeding into personal with full titles. Those are two rules.

Worth checking before you upgrade for capacity: if you're stuck at the sync limit with three or four calendars, one Push with several sources often does what you were about to build two syncs for.

The limit that isn't a numberCopy Anchor Link

A sync's size is weighted, not counted. A Push is charged as sources × targets, so a sync with 3 sources and 3 targets costs more than one with 5 sources and 1 target, even though it has fewer calendars.

This is why a setup can be refused while you're still under the calendar count. The message names it as a complexity limit. Fewer targets, or one-way instead of Mirror, is usually the fix.

Calendars you didn't know you hadCopy Anchor Link

Connecting an account doesn't sync anything by itself. You pick calendars per sync, and only the ones you pick count against these limits.

Google accounts usually carry Birthdays, Holidays, and sometimes Tasks. They appear in the picker and are easy to select by accident, at which point they eat calendar slots and fill your other calendar with birthdays. Leave them unselected unless you specifically want them.

Known limitationsCopy Anchor Link

• Mirror allows fewer calendars per sync than Push, on both paid plans. Four against ten on Plus; five against twenty on Pro.
• The same calendar can't be in two syncs that would fight over it. You get a conflict when building the second one, which is deliberate — two syncs writing to one calendar is how duplicates happen.
• Rules pause when a plan no longer includes them. They aren't deleted: each field falls back to its safe default (title "Busy", description and location left out, privacy Private, free or busy Busy) and your rules come back on upgrade. Details on Custom text and rules.
• Downgrading doesn't delete anything immediately. You get a grace period to choose what to keep before the caps apply.
• Editing an existing sync doesn't re-check the caps. A sync that's already over its limit can be saved again.
• Team matches Pro on every limit — exactly, not approximately. What Team adds is one bill, seats you can move between people, and Team sync rules: limits the owner sets on what members' syncs copy. See Team sync rules. If you need more than a Pro limit on a Team plan, ask us and we'll lift it on your account.

Related

What counts as a calendar, a sync, and an account

Accounts, calendars and syncs are three different things and your plan limits each one separately. What each word means, and which limit you're hitting.

Start sync is greyed out

Why the Start sync button is greyed out: five things can hold it, and some show no message. How to find which one it is.

Connecting a second or third account

How to add another Google, Microsoft or iCloud login, what happens when one is already connected, and what disconnecting does to your copies.

Custom text and rules: decide what each copy says

Write a copy's title, description or location yourself with pieces of the original dropped in, and use if-this-then-that rules for text, privacy and free or busy.

Team sync rules: set what your Team's members can copy

How a Team owner limits what members' syncs copy: the team default, groups by email domain, exceptions, what each setting does, and how a change reaches existing copies.

What SYNCDATE can't do

The limits no plan removes: syncs don't chain, special event types are Google-only, feeds are read-only, and colour is approximate between providers.