Skip to content
Find us on Product Hunt

Product Hunt launch offer: 50% off year one

Use code PH50 on a new Basic or Professional annual plan. Only until Oct 27, 23:59 Berlin time.

See the launch
Kalender Sync by
Try for free

Tool comparison

Kalender Sync vs. SyncThemCalendars – which sync fits you?

SyncThemCalendars is quick to set up and has strong reviews – but it's heavily geared toward the Google ecosystem and processes data in the US. Kalender Sync is built on hosting in Germany, a DPA and a permanently free tier. Here's the honest comparison.

Try free for 7 days See the SyncThemCalendars view

Background

What can SyncThemCalendars do?

SyncThemCalendars is a sync tool from Monkey Cube Studio PTE LTD, based in Singapore (160 Robinson Road), that is mostly installed as an add-on via the Google Workspace Marketplace – with more than 21,000 installs there. The focus is clearly on Google Calendar, with Microsoft Outlook/Office 365 and Apple iCloud added. Per sync, any field (including title and description) can be hidden so that only „Busy" is transferred. Plans: Basic $3.99/month (5 syncs), Premium $7.99/month (16 syncs) and Professional $17.99/month (36 syncs), with a 14-day trial and no credit card required. Setup is considered fast and reviews are good. According to its privacy policy, however, personal data is stored and processed in the US (safeguarded by standard contractual clauses).

Where SyncThemCalendars is strong

Fast setup right inside Google Workspace
As a Google Workspace Marketplace add-on, SyncThemCalendars is set up in a few clicks – especially convenient if you already work deep in the Google ecosystem.
Granular field-level privacy
You can selectively hide individual fields of copied events – including title and description. That lets you reduce a sync to plain „Busy".
Established with strong reviews
The tool has been on the market for a while, counts more than 21,000 installs in the Google Workspace Marketplace and scores consistently high on review portals. If you want a proven solution within the Google world, it's a solid bet.

Where Kalender Sync wins

Tap a point to see the reasoning.

  • Hosting in Germany instead of data processing in the US

    Per its own privacy policy, SyncThemCalendars stores and processes personal data in the US. Kalender Sync hosts at Hetzner in Nuremberg, as a German company under German law – a clear advantage for GDPR, audits and works-council agreements.

  • A DPA with a German contractual partner

    With Kalender Sync, a data processing agreement is included on every plan for business use – part of our terms. No publicly available DPA could be found for SyncThemCalendars – a real issue for regulated industries.

  • A permanently free plan

    SyncThemCalendars has no free tier, only a 14-day trial – after that every plan costs money. With Kalender Sync, one sharing is permanently included in the free plan, no credit card required – syncing your own calendars starts on Basic.

  • Genuine live-sharing into other calendars

    SyncThemCalendars copies events between your own connected accounts. Kalender Sync can additionally embed your availability into another person's calendar by invitation, where it stays synced automatically – a dedicated sharing flow, not just mirroring your own accounts.

  • Real provider breadth instead of a Google focus

    Kalender Sync connects Google, Outlook, Apple iCloud, GMX, WEB.DE, mailbox.org, Posteo, STRATO and Infomaniak kSuite on equal footing, plus iCal feeds from the Basic plan up. SyncThemCalendars is historically Google-centric and supports Google, Outlook and iCloud.

  • A two-way sync counts as one here

    SyncThemCalendars bills by number of syncs: Basic $3.99/month for 5, Premium $7.99 for 16, Professional $17.99 for 36. Kalender Sync Basic costs €5/month and includes three calendar accounts and five synchronisations that may run both ways without any of them counting twice. How many syncs your setup needs at SyncThemCalendars is best checked during its free trial.

When should you pick which?

SyncThemCalendars is the right choice if:

  • You work entirely within the Google Workspace ecosystem.
  • You want a quickly installed Marketplace add-on.
  • US data processing is uncritical for you.
  • You don't need a permanently free tier.

Kalender Sync is the right choice if:

  • You're based in the EU/DACH and take data protection seriously.
  • You need hosting in Germany, a German company and a DPA.
  • You want the broadest provider coverage in this comparison: 10 provider types – Google, Microsoft Outlook/M365, Apple iCloud, GMX, WEB.DE, mailbox.org, Posteo, STRATO, Infomaniak kSuite and iCal feeds. Kalender Sync is the only tool in this comparison with ready-made connections for the German providers GMX & WEB.DE – no server address to type in.
  • You want to share your availability live into other calendars – not just mirror your own accounts.
Try free for 7 days

Ready for calendar sync that passes the DACH compliance test?

Connect your calendars in a few clicks – GDPR-compliant, hosted in Germany, with a permanently free plan.

Try free for 7 days

Currently supported providers

GoogleMicrosoftApple iCloudKKSuiteGMXWEB.DEmailbox.orgiCal-Feeds