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

· 2 min read
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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.