SYNCDATE vs 2calendars: Google-Only Sync or Every Calendar

Quick Answer: 2calendars is the better pick if every calendar you own is a Google Calendar and you want one pair mirrored as Busy blocks with nothing to configure. SYNCDATE is the better fit when one of your calendars is Outlook, iCloud, Fastmail or any other CalDAV server, when several calendars need to sit in one sync, when a rule should decide what each copy says, or when a team needs it on one bill. On both, a new copy shows as Busy (on SYNCDATE, unless it is a two-way Mirror between calendars you own). We make SYNCDATE, so weigh this as our view; 2calendars facts were checked on 19 October 2026 on its own pages.

2calendars and SYNCDATE answer the same question, "am I actually free?", for people whose work and personal lives live in different calendars. They answer it differently. 2calendars does one provider and does it with almost no settings. SYNCDATE covers every provider we could reach and gives you control over what the copies look like. This page says where that line falls, using what 2calendars publishes on its own site on 19 October 2026. Where a page does not say, we say we could not confirm it.

What 2calendars is

2calendars is run by Q2A Co., Ltd. in Tokyo. Its commercial disclosure describes the service as "currently offered as a beta service". It mirrors events between Google Calendar accounts and nothing else: its own roundup calls it "a Google-only tool" and points people who need Outlook or iCloud elsewhere.

The unit you work with is a connection between two Google calendars. A connection runs one way or both ways, and 2calendars describes two-way as "two independent one-way legs rather than a merge", so each direction keeps its own privacy setting. Mirrored events show as "Busy" unless you choose a custom title or full details for that connection. You can connect as many Google accounts as you like; the plan caps the number of connections, not accounts.

Rules are title tags. Put [nosync] in an event title and it is skipped; put [urgent] in and it is always mirrored. Health monitoring emails you when a connection breaks. Setup is pitched at "60 seconds", and from what its support pages describe, that is a fair description.

The Free plan is one connection, forever, with no card. Pro is $7 a month for up to 6 connections, Business $19 a month for up to 40, both with a 14-day trial. There are no refunds, by their own disclosure.

What SYNCDATE is

SYNCDATE connects Google Calendar, Outlook and Microsoft 365, CalDAV calendars (iCloud, Fastmail, Nextcloud and any other server that speaks the standard) and iCal feeds as one-way sources. A sync holds the calendars you pick and a direction. Push copies one way and never touches the source. Mirror goes both ways, so each calendar gets a copy of the others' events.

New syncs copy events as Busy. A two-way Mirror between calendars you own keeps the real titles. You can change either before you start. Google and Outlook changes usually reach the other calendar in under a minute, because both providers send us a notification; CalDAV calendars are checked about every 15 minutes, and iCal feeds on a schedule.

What a copy says is set on the sync screen. Custom text builds the title, description or location from pieces of the original, on every plan. On Plus and up, if-this-then-that rules decide the result, for example "10 or more guests, show Busy" or "a guest from acme.com, put [Acme] in the title". On Pro each destination calendar in a sync can have its own rule.

Free covers 2 accounts, 2 calendars and 1 sync with no card. Plus allows 5 accounts, 5 syncs and 20 calendars; Pro and Team allow 20 accounts, 20 syncs and 100 calendars. Prices are on the pricing page.

Providers: the line that decides it

If every calendar you care about is a Google Calendar, both tools fit, and the rest of this page is about taste. If one of them is not, 2calendars is out, by its own description.

That matters more often than it sounds. A company Outlook calendar and a personal Gmail. An iCloud calendar on your phone and a Google Workspace account at work. A Fastmail or Nextcloud calendar you run yourself. Each of those is a two-way calendar in SYNCDATE, and a feed from a club or a school can be added as a source. For two Google accounts specifically, we also keep a ranked list of Google-to-Google tools that includes 2calendars.

One pair per connection, or several calendars in one sync

A 2calendars connection is one pair of calendars. Its multi-account article describes a freelancer with three clients as one connection per client calendar into the personal calendar. If all four calendars should show each other's busy time, that is more connections again, and the Free plan has one.

In SYNCDATE the same job is one sync. A Mirror holds 2 calendars on Free, 4 on Plus and 5 on Pro, and every calendar in it receives the others' events. A Push can feed up to 10 calendars (Plus) or 20 (Pro) into one calendar you actually look at. Three client calendars pushing into one working calendar is one sync with four calendars in it.

One caveat on our side: two separate syncs do not chain. Mirror A-B plus Mirror B-C never puts A's events on C, so put all three in one Mirror. 2calendars' pages do not say whether its connections chain, so we cannot compare that.

Privacy: both start at Busy

This is the part where the two tools agree. 2calendars writes a Busy block with "No title, no description, no attendees, no location" by default, and lets you switch a connection to a custom title or to full details. Changes apply to future events only.

SYNCDATE's new syncs copy events as Busy too. The exception is a two-way Mirror between calendars you own, which keeps the real titles, because there is nobody to hide them from. Where we go further is what sits between Busy and everything: Custom text can write "[Acme] Busy" or "Work: Busy" on every plan, rules on Plus can show details for some events and Busy for others, and on Pro the same sync can show full titles on your personal calendar and Busy on the work one.

If you only ever want Busy, 2calendars' one switch is simpler. If some copies should say more than Busy and some less, that is what the rules are for.

Speed

2calendars says Google notifies it of a change and the mirror "typically completes within a few seconds", and adds that this is "not a guarantee". If a change takes more than 15 minutes, its support page says something is wrong.

SYNCDATE listens for the same Google notifications, and for Outlook's, so those changes usually reach the other calendar in under a minute. A safety poll runs behind that every 15 minutes on paid plans and every 2 hours on Free, because Google warns that push notifications are not perfectly reliable. CalDAV calendars and iCal feeds have no push, so they poll. Neither of us publishes a measured figure, so we are not going to claim we are faster. On a pair of Google calendars you will not notice a difference.

Rules: tags or conditions

2calendars' rules are two tags in the event title. That is quick to learn and needs no screen. It is also the whole feature: no conditions on length, time of day, weekday, guests or colour are described on its pages.

SYNCDATE's filters skip all-day events, free events, titles containing a word, invitations by your reply, events outside a working-hours window and, on Google, event types. Rules on Plus and up look at an event's length, start time, weekday or a guest's email domain and change what the copy says. They do not skip the event, and there are no buffers.

What happens when you stop

2calendars' support pages are clear: "Mirrored events are not automatically removed" when you disconnect an account or delete your account. You delete them by hand.

In SYNCDATE, deleting a sync asks whether the copies it created should go with it or stay.

Where the data lives

2calendars processes data on Google Cloud "in the United States, Japan, or other regions" under Japanese privacy law. SYNCDATE runs at Hetzner in Germany and Finland, and our Data Processing Agreement is published at syncdate.app/dpa for every plan, including Free. If you need an EU processor or a DPA you can read before signing up, that is a difference. If you do not, it is not.

Teams

2calendars sells licences of its individual plans to a team, with an admin handling billing and invoices on request. SYNCDATE's Team plan gives every seat Pro on one bill, with five seats minimum; admins see sync health, never events, and can set how members' syncs copy events.

Pricing

2calendars' prices on 19 October 2026: Free $0 for 1 connection, Pro $7 a month for up to 6, Business $19 a month for up to 40. A 14-day trial on the paid plans. Prices are in US dollars, with yen billing for Japanese-language customers. Annual pricing is not published.

SYNCDATE has Free, Plus, Pro and Team plans; the current prices and every cap are on the pricing page. Free needs no card. Plus and Pro start with a 7-day trial that asks for a card up front, and you can cancel inside the 7 days without being charged. On price alone 2calendars is lower at the entry tier, and it has a permanent free connection. If budget decides it, that counts.

Which should you choose

Choose 2calendars if:

• Every calendar you own is a Google Calendar, now and for the foreseeable future
• One pair of calendars, mirrored as Busy, is the whole job
• You want the lowest price and a free connection that never expires
• You read Japanese and want yen billing

Choose SYNCDATE if:

• One calendar is Outlook, Microsoft 365, iCloud, Fastmail, Nextcloud or any CalDAV server
• Three or more calendars should show each other's events in one sync
• Some copies should say more than Busy and some less, and a rule should decide which
• Each destination calendar in the same sync should show a different level of detail (Pro)
• You want copies removed for you when a sync goes
• You need an EU processor and a published DPA, or a team on one bill

Neither is a bad choice. For two Google calendars and nothing else, 2calendars gets you there with less to think about. The moment a non-Google calendar shows up, it stops being a choice.

If you are weighing other tools too, see SYNCDATE vs Hetk, SYNCDATE vs LeapSync and the calendar sync tool comparison.

Moving from 2calendars

Set up the SYNCDATE sync first and check that copies land as you expect. Then disconnect the 2calendars connection. Its own pages say the Busy blocks it created stay in your Google Calendar, so delete those by hand before the new sync runs, or you will see two blocks for every event until you do. Two tools writing to the same calendar will produce duplicates in the meantime.

Before you start, compare the plans on the pricing page: Free covers one two-calendar sync, and the 7-day Plus trial covers up to 4 calendars in one Mirror.