2calendars vs. OneCal: which calendar sync tool fits you?

If you’ve found OneCal, you’re probably already sold on the idea of automatic calendar sync. The question is which tool fits how you actually work. OneCal is a multi-provider sync suite with scheduling links and team features built in. 2calendars is a narrower, Google-only tool built around one thing: mirroring events between two Google accounts in real time, privately, for free. Here’s how they actually compare.

OneCal vs. 2calendars at a glance

Dimension	2calendars	OneCal
Real-time sync	Yes, mirrors within seconds	Yes, real-time sync
Sync direction	One-way ×2 (independent one-way legs, never merged)	One-way and multi-way
Privacy default	”Busy” block by default, opt in to full detail	Private event controls; choose what syncs, exclude by color/category
Providers	Google Calendar only	Google Calendar, Outlook, iCloud Calendar
Multiple accounts	Yes, any number of Google accounts	Yes, multi-provider
Free tier	Yes, 1 connection, forever free, no credit card	No permanent free tier, 14-day free trial, no credit card, paid after
Price	Free · Pro $9/mo · Business $19/mo	$5-$25/user/mo, billed annually
Category	Dedicated Google-to-Google sync	Broader suite (scheduling links, unified view, team/SSO)

When OneCal is the better choice

If your calendars span more than Google, say you’re on Outlook at work, Google personally, and a partner or family member is on iCloud, OneCal covers that in a way 2calendars simply doesn’t; 2calendars is Google-only by design. Picture someone who switched employers and inherited a Microsoft 365 mailbox while keeping their personal life on Google: for that person, a Google-only tool is a non-starter no matter how good its privacy defaults are, and OneCal’s Google/Outlook/iCloud coverage is the actual requirement.

OneCal also goes well beyond sync itself: it bundles Calendly-style scheduling links, a unified calendar view that shows Google, Outlook, and iCloud side by side, native iOS/Android/macOS apps, and integrations with Zoom, Google Meet, Teams, and Zapier. If you’re a consultant who books client calls, needs a single pane of glass across three calendar providers, and wants a booking page without paying for a separate scheduling tool, that bundle can genuinely replace two or three other subscriptions at once. For teams, OneCal adds user provisioning, admin-managed accounts, OIDC/SAML SSO, and SCIM: real enterprise plumbing that a company rolling calendar sync out to dozens of employees will actually need and that a two-person sync tool won’t offer. If you want one app that replaces several separate tools across a mixed-provider setup, OneCal’s breadth is a genuine advantage, and it lists a 4.7/5 G2 rating on its own pricing page.

Where 2calendars fits

2calendars is built for a narrower job: keeping two (or more) Google Calendar accounts quietly in sync, privately, without merging them into one calendar. Every connection defaults to showing mirrored events as a plain “Busy” block, no title, description, location, or attendee list, so your boss doesn’t see your dentist appointment and your partner doesn’t see a client’s meeting agenda. You can opt into full details or a custom title per connection whenever you actually want that. And because two-way sync is implemented as two independent one-way legs rather than a merge, each direction keeps its own privacy setting and rules: your calendars stay the two separate things they already are.

Consider a freelancer juggling two or three Google accounts: a personal one, one for a long-term client who wants visibility into availability, and one for occasional project work. Nobody in that mix needs a unified inbox, scheduling links, or SSO; what they need is for each Google account to quietly know when the others are booked, without anyone outside the freelancer seeing what’s actually on the calendar. That’s exactly the one-way-×2 model: the client-facing connection can stay a plain “Busy” block while the personal-to-project leg shows full details, each independently configured, with zero merge risk of the wrong calendar swallowing the other.

The other difference that matters for a lot of people: 2calendars has a genuinely free tier. One sync connection, forever, no credit card and no trial clock running out. OneCal’s cheapest path in is a 14-day trial that becomes a paid, per-user plan afterward, reasonable for a broader product with team pricing built in, but not free in the way 2calendars’ Free tier is, and per-user billing adds up fast if you’re paying for a household or a couple of side accounts rather than a company seat. If your setup is Google-to-Google, if privacy-by-default matters to you, and if you’d rather not pay per user for scheduling links or a unified inbox view you won’t use, 2calendars is the more focused, and cheaper, fit.

Not sure this is the right comparison for your setup? Our guide to syncing two Google Calendars walks through how the mirroring actually works, and our roundup of the best Google Calendar sync tools lays out more options side by side.

Ready to try the Google-only, privacy-first approach? Start free, one connection, no credit card, live in about 60 seconds.