SYNCDATE vs Kalender Sync: What Each Free Plan Actually Does

> Quick Answer: Both tools host in Germany, both are GDPR-compliant, and both default to hiding event details. The privacy argument between us is a wash, and Kalender Sync says so on their own comparison page. The real split is what you get before you pay: SYNCDATE's free plan is two-way, real-time, and works with every provider we support. Kalender Sync's free plan is one-way, Google and Outlook only, on a 30-minute interval — keeping your own calendars in sync starts at €4/month. If you need a German contractual partner or want to share your availability into someone else's calendar, they're the better pick.

Kalender Sync published a comparison against us, so it's only fair we publish one back.

We'll be straight about where they win, because they do win in places. Every number below comes from the other side's own pricing page, captured 25 July 2026. Where their pages disagree with each other, we quote both and let you decide.

What Kalender Sync is

Kalender Sync is run by PPJ Venture Labs UG (haftungsbeschränkt) in Munich. German company, German law, German-language support, hosted at Hetzner.

Their product is built around two different things, and the distinction matters for reading their pricing:

• A sync connects two of your calendars.
• A sharing shows your events inside another person's calendar — your employer, your team, your family — at a detail level you pick.

That second one is genuinely theirs. We don't have it. If what you want is "let my boss see when I'm busy without giving her my calendar," Kalender Sync does that natively and we don't.

The free plans are not the same product

This is the part their comparison page compresses into one row. Their page says SyncDate's free plan is "✓ (with trial)" and theirs is a "permanently free plan with full synchronisation."

Both plans are genuinely permanent. Neither needs a card. But "full synchronisation" is carrying a lot of weight — here is their own feature table next to ours.

Their free tier does one job well: show your availability to one other person, refreshed every half hour. That's a real product and it's free forever.

But if you came looking to keep your own work and personal calendars in step — the thing most people mean by calendar sync — that is Basic (€4/month) on their side. Two-way sync is €4. Self-Sync is €4. iCloud is €4. Real-time is €4.

On our free plan all four are included. What you give up instead is reach: we sync 30 days ahead, they do 6 months.

CalDAV: their two pages disagree

Their comparison page gives Kalender Sync a tick for CalDAV Support, and the prose claims "9 provider types — Google, Microsoft Outlook/M365, Apple iCloud, GMX, WEB.DE, mailbox.org, Infomaniak kSuite, CalDAV and iCal feeds."

Their pricing page, captured the same morning, lists "CalDAV (generic)" with a SOON badge — a dash on Free and Basic, and the word "Soon" on Business and Team. No plan offers it yet.

We're not going to tell you which page is right; that's theirs to sort out. We'll just note that generic CalDAV is the row where they claimed parity with us, and it's the row their own pricing page marks as not shipped.

On our side CalDAV isn't an integration list at all — it's a protocol. We connect to any RFC-4791 CalDAV server: iCloud, Fastmail, Nextcloud, mailbox.org, Posteo, Infomaniak, self-hosted. That's also why their page marking GMX and WEB.DE as unavailable on SYNCDATE isn't right. Both publish CalDAV endpoints, and both work with us today.

That's the honest difference in approach. They count branded integrations and ship them one at a time. We implemented the standard, so there's no list to be on.

The DPA question

Their comparison page says: "No publicly available DPA could be found for SyncDate."

Our Data Processing Agreement is at [syncdate.app/dpa](/dpa). It's a full Article 28 GDPR agreement — parties and roles, subprocessor terms, a technical and organisational measures annex, breach notification, audit rights — incorporated into our Terms by reference, no signature required, and it covers every customer on every plan including the free one.

In fairness to them, it wasn't easy to find. Our own Terms of Service linked it at a stale path that returned a 404, and our footer didn't link it at all. That's our mistake and it's fixed. If you evaluated us before this week and concluded we had no DPA, that's on our sitemap, not on you.

Their DPA is available at every tier too. Their pricing table lists it as "On request" on Free and Basic, and included on Business and Team. So the difference here is small and worth stating plainly rather than inflating: ours is a URL, theirs is an email. If you're in procurement and need the document in front of you before you sign up, that's a difference. If you're happy to ask for it, it isn't.

Where Kalender Sync is the better choice

We'd rather you pick the right tool than pick us.

You need a German contractual partner. We're DUMA DIGITAL SOLUTIONS S.R.L., a Romanian company. We host in Germany and Finland at Hetzner, we're GDPR-compliant, and our DPA is public — but the entity is Romanian. If your works-council agreement, your legal team, or your own comfort requires a German counterparty under German law, Kalender Sync has that and we don't. No amount of arguing changes it.

You want to share availability into someone else's calendar. Their sharing flow — they invite, the other person accepts, and it stays in sync from then on — is a different job from what we do. We sync accounts you control. If you need a third party to see your busy blocks inside their own calendar, that's their product, and it's on their free tier.

You want a custom label on blocked slots. They let you set what the blocked time shows up as on the other side. We show "Busy". Theirs is more flexible.

You sync further ahead than a month and don't want to pay. Their free tier reaches 6 months out. Ours reaches 30 days.

You want to pay slightly less. €4 against our €4.69 at the entry tier, €10 against our €12.49 above that.

Where SYNCDATE is the better choice

You want two-way sync without paying. Ours is free and two-way. Theirs is one-way until €4/month.

Your calendars aren't all Google and Outlook. iCloud, Fastmail, Nextcloud, mailbox.org, Posteo, Infomaniak, or anything else speaking CalDAV — all on our free plan, all shipped today.

Speed matters. We register for Google and Microsoft push notifications, so a change lands on the other calendar in about four seconds. A 15-minute poll runs behind that as a safety net, because Google itself warns that push notifications aren't 100% reliable. Kalender Sync's free tier refreshes every 30 minutes; real-time starts at €4.

You want your AI assistant to reach your calendar. Our MCP server reads and writes — create events, move them, manage syncs — from Claude or any MCP client, on paid plans. They don't offer one.

You want the DPA before you talk to anyone. Ours is a link.

So which one?

Pick Kalender Sync if the contract matters more than the sync: German entity, works-council paperwork, or you need to push your availability into someone else's calendar.

Pick SYNCDATE if the sync matters more than the contract: two-way and real-time on the free plan, any CalDAV server, and an MCP endpoint.

The privacy argument doesn't separate us. Both host in Germany, both are GDPR-compliant, both hide event details by default, and both publish a DPA. Their own comparison page says as much — "a US-vs-EU argument doesn't apply here" — and they're right.