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Tool comparison

Kalender Sync vs. SyncDate – which EU sync fits you?

SyncDate is one of the few competitors that, like us, hosts at Hetzner in the EU and works privacy-first – fast and with broad CalDAV support. We won't make it easy on ourselves: here's an honest look at where SyncDate is strong and where Kalender Sync makes the difference.

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Background

What can SyncDate do?

SyncDate is a young sync tool from DUMA DIGITAL SOLUTIONS S.R.L. (a Romanian company) that hosts at Hetzner in Nuremberg/Falkenstein (Germany) and Helsinki (Finland) and positions itself as GDPR-compliant and privacy-first. It synchronises Google Calendar, Microsoft Outlook, iCloud and any CalDAV server (including Fastmail, Infomaniak, mailbox.org, Posteo, Nextcloud) and reads iCal feeds. For Google and Outlook the sync runs via webhooks, usually in under a minute; CalDAV and iCloud sources are polled roughly every 15 minutes. Events show up as „Busy" by default, with titles and details optionally copied per sync. According to its homepage, this also lets you place busy blocks in a client's Outlook calendar. Distinctive extras include a cross-device unified calendar view and an MCP endpoint for AI agents.

Where SyncDate is strong

Fast sync for Google and Outlook
For Google and Outlook, SyncDate works over webhooks – according to the vendor, changes usually arrive in under a minute. CalDAV and iCloud sources are polled roughly every 15 minutes. If you mainly sync between the big providers, you get a quick tool here.
Broad CalDAV and EU-provider coverage
Beyond Google, Outlook and iCloud it connects to any CalDAV server – including Fastmail, Infomaniak, mailbox.org, Posteo and Nextcloud. For EU mail ecosystems outside the big three, that's a genuine strength.
EU hosting & privacy-first – like us
SyncDate hosts at Hetzner in Germany (Nuremberg/Falkenstein) and Finland (Helsinki), is GDPR-compliant and shows events as „Busy" by default. Honestly, that's the same foundation as Kalender Sync – a US-vs-EU argument doesn't apply here.
Free plan and AI access (MCP)
There's a permanently free tier (2 calendars, 2 accounts, 1 sync – two-way too, triggered on every change – 30 days ahead), paid plans – Plus at $10/month, Pro at $18.33/month billed annually, Team on request, 7-day trial with a credit card – and an MCP server: on every plan it manages syncs and your account, and from Plus up AI assistants can also read events, find free time and edit them. A thoughtful, modern tool.

Where Kalender Sync wins

Tap a point to see the reasoning.

  • A German company, not a foreign entity

    Kalender Sync is run by PPJ Venture Labs UG (haftungsbeschränkt) in Munich – a German company under German law, with German-language support, a legal notice and a commercial-register entry. SyncDate hosts at Hetzner in the EU, but the operator itself is a Romanian S.R.L. For DACH compliance, works-council agreements and trust, having your contractual partner in-country is a real difference.

  • A DPA with a German contractual partner

    A data processing agreement is part of the Kalender Sync offering – included on every plan for business use, as part of our terms – and you conclude it with a German company under German law. SyncDate also publishes a public DPA at syncdate.app/dpa – the contracting party there, however, is a Romanian S.R.L. If tax advisors, law firms or schools need a tangible in-country contractual partner, that's us.

  • Live-sharing by invitation as a core feature

    SyncDate can also write busy blocks into someone else's calendar – its homepage explicitly mentions a client's Outlook calendar. At Kalender Sync, this sharing flow is the core product: you invite the other person, they accept, and from then on your availability stays synced in their calendar automatically – one sharing is permanently free on the Free plan.

  • Three visibility levels per sharing – with custom display names

    You decide per sync whether only „Busy", „Title + time" or full details are transferred – and you can even set the name a blocked slot shows up as on the other side. Fine-grained control designed for sharing with third parties.

  • A tangible partner for business use

    SyncDate is a very young product built by a small team with email support. Behind Kalender Sync stand a public team, a legal notice with a commercial-register entry, German-language support and a public roadmap. When your calendar is business-critical, it counts to have a counterpart you can reach and assess.

  • A free plan with a 6-month sync range

    Both tools offer a permanently free plan with no credit card, but cut differently: SyncDate gives you 2 calendars from 2 accounts with one sync, 30 days ahead – Kalender Sync a sharing. Syncing your own calendars starts on Basic at €5/month and then reaches 6 months ahead. If you plan further than four weeks out, that is the range you need.

When should you pick which?

SyncDate is the right choice if:

  • You want to connect many CalDAV providers (Fastmail, Posteo, Nextcloud …).
  • Fast sync between Google and Outlook matters most to you.
  • You want a lean self-sync tool with AI/MCP access.
  • A very young tool from a small team is no problem for you.

Kalender Sync is the right choice if:

  • You need a German contractual partner with a DPA and German-language support.
  • You serve regulated industries and must satisfy works-council agreements.
  • You want to share your availability live into other people's calendars by invitation – with one sharing permanently free.
  • You're betting on a product with a public team and a German commercial-register entry.
  • You want to connect GMX or WEB.DE without tinkering: Kalender Sync is the only tool in this comparison with dedicated one-click GMX & WEB.DE integrations – no manual CalDAV setup with server addresses and app passwords. 10 provider types in total: Google, Microsoft Outlook/M365, Apple iCloud, GMX, WEB.DE, mailbox.org, Posteo, STRATO, Infomaniak kSuite and iCal feeds.
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Ready for calendar sync with a German contractual partner and a DPA?

Connect your calendars in a few clicks – GDPR-compliant, hosted in Germany, with genuine live-sharing.

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Currently supported providers

GoogleMicrosoftApple iCloudKKSuiteGMXWEB.DEmailbox.orgiCal-Feeds