Tool comparison
Kalender Sync vs. SyncPenguin – calendar specialist or data platform?
SyncPenguin has been on the market since 2019 and syncs far more than calendars: contacts, tasks and even shop inventory between business apps. If that's exactly what you need, it's worth a look. But if you "only" want to keep your calendars reliably, affordably and GDPR-compliantly in sync, a closer comparison pays off – here it is, honest in both directions.
Background
What can SyncPenguin do?
SyncPenguin is a business synchronisation platform that, by its own account, has served over 2,100 customers since 2019. It syncs four data types bidirectionally: calendars (Office 365, Google Workspace, Exchange on-premise, iCalendar), contacts (including Notion and 20+ other services), tasks (including HubSpot) and shop inventory (Square, Shopify, WooCommerce). On top come Global Address List sync for Microsoft 365 and Google, plus individually built custom integrations on request. Field mappings, filters and rules are configurable through a no-code interface. Pricing starts at $9/month for 2 active sync flows and 2,000 updates/month; further tiers scale by flow count, and yearly billing saves 25%. There's a 14-day trial without a credit card. The team works distributed across Ukraine, the EU and the US.
Strengths
Where SyncPenguin is strong
More than calendars: contacts, tasks, inventory
Beyond calendars, SyncPenguin syncs contacts, tasks and shop stock between business apps like HubSpot, Notion, Shopify or Square. If you're looking for one platform covering several data types, you get far more than a calendar tool here.
Enterprise connectors: Exchange on-premise & GAL
Exchange servers in your own data centre and Global Address List sync between Microsoft 365 and Google Workspace are increasingly rare capabilities – a genuine argument for corporate IT with legacy infrastructure.
Custom integrations on demand
The team builds tailored sync connections for niche apps on request. If your CRM or industry tool lacks a standard connector, that's a service self-service tools simply don't offer.
Established since 2019
Over 2,100 customers since 2019, flexible no-code field mapping and unlimited customisations at no extra cost – SyncPenguin is a mature product with a clear business focus.
Where Kalender Sync wins
Where Kalender Sync wins
Less than half the price
SyncPenguin starts at $9/month for 2 sync flows with an update cap. Kalender Sync costs €4/month on Basic (5 accounts) and €10/month on Business with unlimited connections – with 2 months free on yearly billing. If you want to sync calendars and don't need CRM sync, you simply pay less with us for more calendar functionality.
A permanently free plan
With SyncPenguin, the trial ends after 14 days – then you pay. With Kalender Sync, one synchronisation is permanently free, without a credit card and without an expiry date. You only pay once you need more connections or providers.
A German privacy stack with a DPA
Kalender Sync is run by PPJ Venture Labs UG in Munich, GDPR- and BDSG-compliant, hosted at Hetzner in Nuremberg, with a DPA for business customers and German-language support. SyncPenguin works distributed across Ukraine, the EU and the US; no publicly available DPA or EU-hosting commitment could be found. For tax advisors, law firms and companies with works-council agreements, that's the deciding difference.
Genuine live-sharing into other calendars
SyncPenguin connects accounts and systems with each other. Kalender Sync can additionally embed your availability into another person's calendar by invitation – they accept once, and from then on everything stays in sync automatically. That sharing flow is a core feature for us.
Three visibility levels instead of field mapping
With SyncPenguin you govern data flow through field mappings and rules – powerful, but configuration work. With Kalender Sync you simply choose per sync: "busy only", "title + time" or "full details" – with custom display names for blocked slots. Data minimisation as a choice, not a project.
9 provider types – including GMX & WEB.DE
SyncPenguin focuses on business suites like Office 365 and Google Workspace. Kalender Sync connects 9 provider types: Google, Microsoft Outlook/M365, Apple iCloud, GMX, WEB.DE, mailbox.org, Infomaniak kSuite, CalDAV and iCal feeds – as the only tool in this comparison with the German consumer providers GMX and WEB.DE. A private German mail calendar next to your work account is our home game.
Self-service instead of a sales conversation
Kalender Sync is built for the 2-minute start: connect an account, pick a visibility level, done – with genuine two-way sync from the first connection. With SyncPenguin, individual requirements and custom integrations quickly lead to back-and-forth with the team. Right for special business cases, overhead for a quick calendar sync.
Decision guide
When should you pick which?
SyncPenguin is the right choice if:
- You want to sync contacts, tasks or shop inventory alongside calendars.
- You need Exchange on-premise or GAL sync between Microsoft 365 and Google.
- You need an individually built custom integration for a niche tool.
- The budget is there: from $9/month for 2 sync flows.
Kalender Sync is the right choice if:
- You want to sync calendars – more affordably, with a permanently free plan.
- You need a German contractual partner with a DPA, GDPR/BDSG compliance and Hetzner hosting.
- You want to share your availability live into other people's calendars – with selectable visibility per sync.
- You want to start self-service in 2 minutes, without coordination rounds.
- You want the broadest calendar-provider coverage in this comparison: 9 provider types – Google, Microsoft Outlook/M365, Apple iCloud, GMX, WEB.DE, mailbox.org, Infomaniak kSuite, CalDAV and iCal feeds. Kalender Sync is the only tool in this comparison with the German providers GMX & WEB.DE.
Ready for the calendar specialist with a German privacy stack?
Connect your calendars in a few clicks – GDPR-compliant, hosted in Germany, with two-way sync and genuine live-sharing.
Try free for 14 daysCurrently supported providers
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