OneCal vs CalendarBridge: Calendar Sync Comparison (2026)

OneCal and CalendarBridge are close cousins: dedicated calendar sync tools, both covering Google, Outlook and iCloud, neither with a free tier. The comparison people expect — "one does Apple, the other doesn't" — isn't the real one. Both do.

What actually separates them is how far each plan scales and what the top of the ladder costs. OneCal's plans cover 2, 5 and 50 calendars. CalendarBridge's cover 2, 5 and 8. Below five calendars the two are within a dollar of each other. Above eight, only one of them sells you a plan at all.

There's a third difference worth knowing before you sign up for either, because it decides how cheap it is to change your mind later: what happens to the copied events when you disconnect.

The Quick Answer

• Choose OneCal if your calendar count will grow past eight, or you want every feature on the entry plan and only pay for scale
• Choose CalendarBridge if you're at two to five calendars, want a monthly option without an annual commitment, and want the vendor's stated cleanup on disconnect
• Choose [SYNCDATE](https://syncdate.app) if you want to test before paying, need sync measured in seconds rather than minutes, or want two-way CalDAV alongside Google and Outlook

The full breakdown follows.

Pricing, With the Billing Basis Attached

Comparing these two is easy to get wrong, because the headline numbers aren't on the same footing. OneCal publishes annual rates on its pricing page; its monthly rates sit behind a client-side toggle and aren't in the served page, so this guide doesn't quote them. CalendarBridge publishes both.

OneCal — per user, USD, billed annually:

OneCal's own summary of what separates the tiers: "Every plan includes our full set of integrations and apps. Pick the tier that matches the number of calendars and level of support you need." The plans are otherwise identical — including SSO on the $5 entry plan. Beyond calendar count, the only difference is standard support versus dedicated support on Premium.

CalendarBridge — per user, USD:

Group pricing uses the same per-user numbers with a two-user minimum. CalendarBridge also sells sync licenses separately, starting at $4 per connection ($3.20 billed annually). Note that their help documentation counts the same plans in "sync connections" (2 / 16 / 36) rather than calendars — worth checking against your own setup before you buy.

Neither has a free tier. OneCal's FAQ: "All new users are offered 14 days free trial, no credit card required. After that, you'll need to upgrade to a paid plan to continue using OneCal." CalendarBridge offers a trial too, but publishes no duration on any page, so plan around not knowing.

SYNCDATE is 2 calendars free, permanently, no credit card. Paid plans are €8.99/month for 20 calendars across 5 accounts, and €16.99/month for 100 calendars across 20 accounts.

Where the Ladder Ends

This is the difference that decides the choice for a lot of people, and it barely gets mentioned:

• CalendarBridge tops out at 8 calendars, at $40/month ($32 billed annually).
• OneCal tops out at 50 calendars, at $25/user/month billed annually.

If you're running a personal calendar, a work calendar and one shared team calendar, both fit and the price gap is small. If you're a consultant carrying a calendar per client, or you're mirroring across several workspaces, CalendarBridge's Pro plan is the end of the road — and a nine-calendar setup is a purchase you can't make there.

At the top of each range, the per-calendar cost diverges sharply: CalendarBridge Pro is 8 calendars for $32/month annually; OneCal Premium is 50 for $25/user/month annually.

For reference, SYNCDATE's Plus plan covers 20 calendars across 5 accounts at €8.99/month, and Pro covers 100 across 20 accounts at €16.99/month.

Sync Speed: What Each Vendor Claims

Neither vendor publishes measured latency, and neither do we run stopwatch tests on other people's products. Here is what each one says.

OneCal advertises "Real-time calendar sync (Google Calendar, Outlook, iCloud Calendar)". One qualifier appears on its homepage: "iCloud Calendar updates take up to 10 minutes to reflect on the other calendars."

CalendarBridge describes speed three different ways across its own pages — "Events typically update in under a minute" on pricing, "Events typically sync in seconds" on the group page, and "within a minute or two" on the homepage. Read together, their pages claim roughly a minute for Google and Outlook. For iCloud and .ics connections they're specific: "syncing occurs every 5 to 10 minutes."

SYNCDATE uses Google Calendar push notifications and Microsoft Graph change notifications — webhooks that fire on the change rather than on a clock. Our average sync time is about 4 seconds, with a 15-minute polling pass behind them as a backstop.

Why this matters: scheduling tools like Calendly and Google's "Find a Time" read your calendar to work out availability. If a meeting lands on your work calendar and the copy hasn't reached your personal one, the scheduling tool still sees a free slot — and someone books it. That's the mechanism behind most double-bookings.

Platform Support

OneCal: Google Calendar, Outlook and iCloud Calendar. Their pages make no CalDAV or iCal-feed claim.

CalendarBridge: Google, Microsoft 365 business accounts, Microsoft personal accounts (outlook.com, hotmail, live, msn), iCloud, and "other providers via .ics link". Their pricing page lists a shorter provider set than their homepage does, so check the specific combination you need.

SYNCDATE: Google Calendar and Microsoft Outlook/Office 365 through the native APIs, plus two-way CalDAV sync for iCloud, Fastmail and Nextcloud, plus iCal feeds as a read-only source.

Apple coverage is not the deciding factor between these two that it's often made out to be — all three tools reach iCloud.

The Exit

If you disconnect, do the copied events stay on your calendar or come out?

CalendarBridge answers this on its homepage: "if CalendarBridge doesn't meet your needs, simply delete your sync connections and we will remove all the event copies we created; leaving your calendar exactly as we found it." That's the good version of this answer — and it's important to know before you switch tools, because it means the mirrored blocks disappear when you cancel.

OneCal publishes no statement on disconnect cleanup that we could find, so we're not going to characterize their behaviour. Ask their support before you rely on either outcome.

SYNCDATE lets you decide at delete time: remove every event it created in one step, or leave the copies in place. We call the removal option Clean Exit, and because nothing is removed unless you ask, you can trial a configuration without gambling your calendar on it — and you're never caught out mid-switch.

Privacy

Both vendors offer event-level controls. Neither publishes a default-privacy posture, hosting region or token-encryption detail that we can quote, so this guide doesn't fill those gaps with guesses.

SYNCDATE writes synced events as "Busy" by default — title, description and attendees stay on the source calendar unless you turn detail copying on. We host in the EU (Hetzner, Germany) and encrypt OAuth tokens at rest with AES-256-GCM. For the longer version, see privacy in calendar sync.

Feature Table

Every competitor figure below is from the vendor's own published pages, captured July 2026. A blank cell means the vendor publishes nothing on that point — not that the capability is missing.

The honest summary: these two are more alike than the marketing suggests. Pick on scale, billing shape, and how confident you want to be about the exit.

Who Each One Suits

OneCal makes sense if:

• Your calendar count is heading past eight, where CalendarBridge's ladder stops
• You want every feature — including SSO — on the cheapest plan and pay only for scale
• An annual commitment is fine, since that's the pricing basis they publish

CalendarBridge makes sense if:

• You're comfortably inside 2-5 calendars, where it's the cheaper of the two
• You want a month-to-month option rather than an annual commitment
• The stated cleanup on disconnect matters to you
• You need connections to providers reachable by .ics link

For more on either, see our OneCal alternative comparison, the CalendarBridge pricing breakdown and the CalendarBridge alternative comparison.

The Third Option: SYNCDATE

What both of these ask you to do is pay before you know whether the tool handles your setup. SYNCDATE's free tier exists so you don't have to.

Two calendars, free forever, no credit card. The same webhook sync as the paid plans, the same "Busy" default, the same clean exit. If it works for you, Plus is €8.99/month for 20 calendars across 5 accounts.

The differences we'd point to: sync in about 4 seconds via provider push notifications rather than a polling interval; two-way CalDAV for iCloud, Fastmail and Nextcloud; EU hosting with the infrastructure published; and a delete that actually deletes.

For a full market comparison including Reclaim, OGCS and others, see our best calendar sync tool comparison.

Switching to SYNCDATE

If you're on OneCal or CalendarBridge and want to move:

1. Sign up for SYNCDATE (free, no credit card)
2. Connect your Google, Outlook or CalDAV accounts
3. Recreate your current sync configuration — two to three minutes per sync
4. Run both tools in parallel for a day and confirm events land where you expect
5. Cancel the old subscription once you're satisfied

One thing to plan for: CalendarBridge states that deleting your sync connections removes all the event copies it created. So when you cancel, the blocks it placed on your calendars go with it. Do the parallel run before you disconnect, so SYNCDATE has already recreated those blocks and you never see a gap. OneCal publishes nothing about disconnect behaviour — ask their support, and either way, keep the overlap period.

For a step-by-step walkthrough, see our Google Calendar sync guide or the Google and Outlook sync guide. For background on why sync delays happen at all, see why calendar sync is delayed.