Calendar Sync Pricing in 2026: What Every Tool Actually Charges

Calendar sync runs from €0 to $40 a month, and most of the confusion comes from three things: annual prices printed as if they were monthly rates, "free" that turns out to be a 14-day trial, and calendar limits that are much lower than the marketing suggests. This guide lists what each vendor publishes, labels whether the figure is a monthly or an annual rate, and says plainly where a vendor publishes nothing at all.

Every price below comes from the vendor's own pricing page. Where a vendor's price only renders behind a JavaScript toggle, or where they simply do not state a number, this guide says so instead of guessing.

For what these tools actually do under the hood, see how calendar sync works.

First question: is there a free tier, or only a trial?

This is where most comparison articles — including earlier versions of this one — go wrong. A limited free tier and a free trial are not the same product decision. One lets you stay; the other stops working.

Tools with a real free tier

Tools with a trial only

If a permanent free tier is the deciding factor, that first table is your shortlist.

Published prices, with the billing basis labelled

Vendors quote prices on different bases, and the difference is often 20-30%. A "$4/mo" headline that is really the annual rate is the single most common way a comparison table misleads.

Notes worth carrying into a spreadsheet:

• OneCal's monthly prices are not published. The monthly/annual toggle on their pricing page renders client-side, so only the annual figures appear in the served page. Any OneCal "per month" number should be read as billed annually unless you have checked the toggle yourself.
• SyncThemCalendars' annual price is exactly twelve times the monthly one ($3.99 × 12 = $47.88, and so on). They state no annual discount.
• CalendarBridge counts different things on different pages. Their pricing page counts calendars (2 / 5 / 8); their help documentation counts sync connections (2 / 16 / 36) for the same plan names. Check which unit applies to your setup before buying.
• Reclaim and Reclaim's competitors are not priced the same way. Reclaim prices per seat as an AI scheduling suite that includes calendar sync; the pure sync tools price per calendar.
• CalendarBridge's group plans use the same per-user numbers, with a minimum of two users.

What the ceiling actually is

The most expensive mistake is buying into a tool whose top plan cannot hold your calendars.

• CalendarBridge tops out at 8 calendars on its $40/mo Pro plan. If you need 15, there is no plan to buy.
• OneCal Premium tops out at 50 calendars at $25/user/mo billed annually.
• SyncThemCalendars lists "unlimited calendars (all types)" on every tier and meters calendar syncs instead — 5, 16, or 36.
• SYNCDATE Pro allows 20 connected accounts and 100 calendars in sync at €16.99/mo.

Work out your real number first — every calendar on both sides of every pair — and then read the tables.

Cost per calendar

Dividing the plan price by its published calendar limit is the cleanest way to compare tools that meter differently. All figures below are the vendor's own published prices divided by their own published limits.

Two caveats. First, a cheap per-calendar rate on a plan you will not fill is not a saving. Second, the unit differs: a "sync" and a "calendar" are not interchangeable, and CalendarBridge's own pages disagree about which one they meter.

Three worked scenarios

Only published prices are used here. No estimate of your time, no assumed failure rate — just what you would be billed.

Two calendars: work and personal

At this size, paying is a choice about speed, provider coverage, or a specific feature — not about capability.

Six calendars across three accounts

This is where the tiering matters most: six calendars pushes both OneCal and CalendarBridge past their mid tiers and into their top ones.

Twenty-plus calendars

Speed: what each vendor actually publishes

Sync latency is worth paying for, but only if the number is real. Several vendors publish no latency figure at all, and this guide prints none for them.

Where a vendor contradicts itself, both statements are quoted above and neither is picked. If sync speed is central to your decision, test the tool during its trial with a real calendar change and time it yourself.

The costs that are not on the pricing page

OGCS: free software, but it needs a machine

OGCS (Outlook Google Calendar Sync) is genuinely free and open source under MPL-2.0, and it is actively maintained — releases have shipped throughout 2026. The catch is not the licence, it is the deployment model: it is a Windows desktop application and it requires a desktop Outlook installation. It syncs when that machine is on and the app is running.

So the real cost is either a PC you leave on, or a Windows VM you rent and maintain, plus your own time keeping both alive. For a technical user who already has that machine, OGCS is excellent value. For everyone else, the "free" is doing a lot of work. See our OGCS alternative guide for the full picture.

Self-hosting: free software, your operations

Keeper is AGPL-3.0 and self-hostable, and the vendor states that self-hosted instances get Pro-tier features by default. That is a real $0 option — with the same asterisk as OGCS. You supply the server, the domain, the updates, the backups, and the on-call. For a developer comfortable with Docker, that is a fair trade. See SYNCDATE vs Keeper for the detail.

Automation platforms: priced for something else

Zapier, IFTTT and Power Automate come up in calendar sync searches, so here is what they publish — with a warning attached.

The warning: Zapier's pricing page makes no calendar claim at all, and IFTTT's plans page does not mention Google Calendar. Their "starting from" prices also float over a task-volume variable they do not price out. You cannot build a reliable calendar sync budget from either page — if you go this route, price it against your actual task volume after a month of real use.

Microsoft's Google Calendar connector is better documented: it is a Standard-class connector with a "when an event is added, updated or deleted from a calendar" trigger, and published throttles of 100 API calls per connection per 60 seconds and a trigger poll frequency of 1 per 90 seconds.

SYNCDATE plans in detail

Prices are charged in EUR (USD equivalents are $8.99 and $16.99 per month). Annual billing gives you two months free on both paid plans; the exact yearly figure in your currency is on the pricing page.

All plans sync Google Calendar, Microsoft Outlook and Office 365, and CalDAV calendars — iCloud, Fastmail and Nextcloud — two-way. iCal feed URLs are supported as read-only sources. OAuth tokens are encrypted at rest with AES-256-GCM, and the service runs on Hetzner infrastructure in Germany.

How to choose without overpaying

According to Harvard Business Review research, professionals lose an average of 9% of their working time switching between applications. Calendar sync is worth paying for when it removes that switching — but only at the tier you will actually use.

A short checklist:

1. Count your calendars first. Both sides of every pair. Then check the ceiling, not the entry price.
2. Check the billing basis on every quoted price. If it says "billed annually", the monthly rate is higher — or, in OneCal's case, unpublished.
3. Check whether "free" is a tier or a trial. SYNCDATE, Reclaim Lite, Keeper and OGCS have tiers. OneCal, CalendarBridge and SyncThemCalendars have trials.
4. Check your providers. Reclaim covers Google and Outlook. OneCal, CalendarBridge and SyncThemCalendars add iCloud. SYNCDATE and Keeper reach iCloud, Fastmail and Nextcloud through CalDAV.
5. Time the sync yourself during the trial. Several vendors publish no latency figure, and two publish more than one.

For a feature-by-feature view of the same tools, see our best calendar sync tool comparison.