Kalender-Sync exits closed beta: 54 users, 38,000 events synced

Two months ago, Kalender-Sync entered closed beta. Today I can say: the closed beta is over, Kalender-Sync is live, on a freemium plan, and open to everyone.

Where we are

• 54 registered users
• Over 38,000 synced events
• 5 providers connected: Google Calendar, Microsoft Outlook, Apple iCloud (CalDAV), Infomaniak KSuite (CalDAV), and iCal feeds
• Bilingual (German + English): landing page and app

What’s changed since the beta started

The beta phase had two jobs: validate stability under real load and collect feedback. Both worked. Concretely:

• CalDAV stabilised: Apple iCloud, KSuite, and generic CalDAV setups now all flow through a unified provider adapter and a dedicated polling job.
• iCal feeds as a read-only source: University schedules, public holidays, external team calendars can now be mirrored one-way into your own calendar.
• Security audit: All stored OAuth tokens and CalDAV credentials are still encrypted with ChaCha20-Poly1305. The audit additionally surfaced and closed a handful of edge cases.
• Onboarding sharpened: Magic-link login, clearer per-provider connect modals, noticeably faster time-to-first-sync.

Freemium instead of waitlist

Instead of running a waitlist further, there are now three tiers:

• Free: one connection, perfect for trying it out
• Basic: €4/month, for the typical “work + personal” pairing
• Business: €10/month, for multiple calendars and teams

All prices include German VAT. Billing runs through Stripe with Stripe Tax enabled, meaning EU customers get correctly itemised invoices automatically.

What’s next

Focus for the next few weeks lives on three axes:

1. Funnel optimisation: fewer drop-offs on the path from sign-up to the first successful sync. The goal: anyone who starts understands in under two minutes what they’re setting up and sees the first mirrored event.
2. Marketing push: getting the story out: use-case content for the typical constellations (work + personal, freelancers with multiple clients, students with university schedules), SEO on the searches people actually type, focused activation in the communities where this pain shows up daily.
3. More providers: the next wave of integrations so that “my calendar isn’t supported” stops being a blocker. Order driven by beta feedback and waitlist demand.

Try it

If you’re juggling multiple calendars and tired of the back-and-forth: kalender-sync.de. The Free tier is enough to get a clean sync running. Feedback welcome, directly to me.