Blog
Insights into our thinking about KalSync
We share what we learn about calendar synchronisation, keep you in the loop on updates, and give honest behind-the-scenes glimpses of our bootstrapping journey.
Paul Koch
AddEvent Alternative: Subscribe Calendars Without Trackers, Hosted in Germany
AddEvent handles single events, RSVP and embedded calendars. Kalender Sync only does subscribe calendars, but without trackers and from €5 a month. The comparison, with sources.
Paul Koch
New: Subscribe Calendars. Your events right in your audience's calendars
Feed, subscribe page and a button for your website: with Subscribe Calendars people subscribe to your events in Apple, Google or Outlook. No trackers, hosted in Germany.
Julius Hasenzahl
Give ChatGPT access to your calendar – how it actually works (2026)
ChatGPT's official calendar connector covers Google only and can't write. With the Kalender Sync plugin you get all your calendars into one connection, with control over what ChatGPT sees.
Julius Hasenzahl
Connect Claude to your calendar – the 5-minute guide (2026)
One connector, all your calendars: how to give Claude access to Google, Outlook, iCloud and more, decide per calendar what it may see, and have it create events on request.
Julius Hasenzahl
Connect Claude Code to all your calendars – one command (2026)
One terminal command, one OAuth login, and Claude Code knows all your calendars. The full setup with scope tips, security boundaries and example prompts for the dev workflow.
Julius Hasenzahl
What is MCP? The Model Context Protocol explained without buzzwords
MCP is the standard Claude, ChatGPT and friends use to talk to your tools. What's behind it, why it won, and what to watch for on security.
Paul Koch
OGCS (Outlook Google Calendar Sync): What the Free Tool Does Well — and Why a Server-Side Sync Is the Better Choice for Most People
OGCS syncs Outlook and Google for free and surprisingly thoroughly — as long as your Windows PC is running. Who it's right for, and why most people are better off with a server-side sync.
Paul Koch
Outlook CalDAV Synchronizer: Powerful Free Add-in — a Dream for Tinkerers, an Afternoon for Everyone Else
The open-source add-in connects Outlook with Google, Nextcloud, and any CalDAV server — for free. Why it remains a tinkerer's tool, and why most people are better off with a server-side sync.
Paul Koch
Product Update July 2026, Part 2: Connect GMX & WEB.DE and Edit Existing Syncs
GMX and WEB.DE as new providers, plus editing existing syncs instead of recreating them — that's the second July update.
Julius Hasenzahl
Sync Outlook and iCloud Calendar: Guide for Work and iPhone Users
How to sync Outlook and Apple iCloud Calendar via free/busy while keeping work and private life cleanly separated.
Paul Koch
Product Update July 2026: 18-Month Sync Horizon, Prefix in the Target Calendar & Gapless Recurring Events
An 18-month sync horizon for Professional, an optional title prefix in the target calendar on all plans, and recurring events without gaps — that's the July update.
Paul & Julius
Kalender Sync is new: two-way sync, 3 visibility levels & a fresh look
We've given Kalender Sync a serious upgrade: real two-way sync, three visibility levels per sync, live-sharing into other calendars, a new login and a fresh look. Here's everything at a glance.
Paul Koch
Best Calendar Sync Tools 2026: GDPR Comparison
The 2026 comparison: calendar sync tools rated by privacy, free/busy, setup, and team readiness.
Paul Koch
Sync Apple Calendar with Google: Guide for Family and Work
How to sync Apple and Google Calendar via free/busy while keeping private details safely hidden.
Paul Koch
CalendarBridge Alternative: Pricing, Privacy, and What You Actually Need
CalendarBridge costs $5-40/mo and hosts in the US. Is it worth it for European teams — or is there a leaner option?
Paul Koch
Share Google Calendar with Apple & iCloud — Securely and GDPR-Compliant
How to share calendars via free/busy while keeping sensitive event details protected.
Paul Koch
OneCal Alternative — GDPR-Compliant & Simple
A GDPR-compliant alternative to OneCal that syncs your calendars in the background and keeps your data in the EU.
Paul Koch
Outlook Google Calendar Sync: 5 Ways to Connect Both Calendars
Five ways to connect Outlook and Google Calendar, from the free iCal subscription to a real two-way sync. Steps, delays and limits compared.
Paul Koch
Kalender-Sync as a SyncGene Alternative: GDPR Compliance Without Extra Tools
Kalender-Sync as a SyncGene alternative with EU hosting and a focus on data minimization.
