Sync your CalDAV calendar with Google Calendar and Microsoft 365
Works with Nextcloud, SOGo, Radicale, Baïkal, Synology, Infomaniak, and more.
Syncs in seconds. GDPR compliant. Hosted in Germany.
Try the full version free for 14 days. No credit card, no auto-charge.
The problem
Calendar sync shouldn't be this hard
Can't connect your CalDAV server
Google Calendar can't add an external CalDAV server, and Microsoft 365 doesn't support CalDAV at all. There's no native way to connect your self-hosted calendar.
Outlook CalDAV Synchronizer doesn't work with New Outlook
The Outlook CalDAV Synchronizer is a COM Add-in — and the new Outlook no longer supports COM Add-ins. As Microsoft rolls out New Outlook via Windows Update, more users are affected.
ICS feeds are too slow
ICS subscriptions are read-only and update only every 24–48 hours. Not useful for up-to-date scheduling.
The solution
The missing bridge between CalDAV and the cloud
CalDAVconnect sits between your CalDAV server and the cloud. It uses webhooks for Google Calendar and Microsoft 365 → CalDAV (1–2 seconds), and efficient CTag-based polling for CalDAV → cloud (avg. 7–8 seconds). No full calendar scans — just a lightweight change detection signal.
Events from the last 90 days and all future events are synced — keeping your cloud calendar clean and relevant.
Compatibility
Works with your CalDAV server
CalDAVconnect works with any standard CalDAV server that supports the CalDAV protocol.
Use cases
Built for real-world setups
Your self-hosted calendar, synced to Google Calendar in seconds.
CalDAVconnect keeps your CalDAV calendar in sync with Google Calendar — no matter which server you use. Bidirectional, syncs in seconds, no ICS feed delays.
- Webhooks for Google → CalDAV, smart polling for CalDAV → Google — syncs in seconds
- Tested with Nextcloud, SOGo, Radicale, Baïkal, Synology, Posteo, mailbox.org and Infomaniak
- Setup takes less than 5 minutes
Connect your CalDAV server to Microsoft 365 — without COM Add-ins.
The Outlook CalDAV Synchronizer relied on COM Add-ins, which the new Outlook no longer supports. CalDAVconnect is a cloud-based bridge that works regardless of which Outlook version your team uses.
- Works with new Outlook, Outlook Desktop, and Outlook Web
- No client-side installation required
- Complements ActiveSync with cloud-to-cloud sync
Use Calendly with your self-hosted calendar — without double bookings.
Calendly only reads availability from Google Calendar or Microsoft 365. By syncing your CalDAV calendar to Google Calendar within seconds, Calendly always sees your true availability.
- Up-to-date availability for Calendly scheduling
- Google Calendar acts as a live bridge
- Eliminates double bookings from stale ICS feeds
Pricing
Simple, transparent pricing
Start with a free 14-day trial of the full version — full speed, all features.
When the trial ends, continue on the Free plan (1 connection · hourly sync · €0 forever) or upgrade anytime.
Free
€0 /month
Free forever for one calendar connection. Ideal if a delay of up to an hour is fine.
- Hourly sync
- 1 connection
- Google Calendar + Microsoft 365
- Bidirectional sync
- GDPR compliant
- Hosted in Germany
No credit card required.
Solo
Most popular€2 /month
Fast sync for a single calendar connection. Ideal for individuals who need up-to-date scheduling.
- Syncs in seconds
- 1 connection
- Google Calendar + Microsoft 365
- Bidirectional sync
- GDPR compliant
- Hosted in Germany
No credit card. No auto-charge. Becomes the Free plan (€0) when the trial ends.
Pro
from €5 /month
For power users and small teams with multiple calendars. Pay per connection, one at a time.
- Syncs in seconds
- 5 connections included
-
Each additional connection €1/month
add or remove one at a time · up to 50 self-service - Google Calendar + Microsoft 365
- Bidirectional sync
- GDPR compliant
- Hosted in Germany
No credit card. No auto-charge. Becomes the Free plan (€0) when the trial ends.
Team
Pilot · on requestfrom €10 /month
For organizations that manage many calendars centrally. Same price per connection as Pro — with no upper limit.
- Everything in Pro
- 10 connections included
-
Each additional connection €1/month
no upper limit · 51–200 €0.80 · from 201 €0.60 · from 500 individual quote - Members & roles (owner, admin, member)
- Admin controls: lock calendar pairs, account overview, daily summary (pilot)
- Change log for calendar pairs (365 days)
- Single sign-on with Google Workspace (pilot)
- Zero-touch setup via Google Workspace delegation (pilot)
- Microsoft Entra ID sign-in (planned)
Need more than 50 connections today? We set you up manually — same price per connection.
All prices incl. VAT.
From 500 connections we quote individually — contact us.
Hosted in Germany. GDPR-native.
CalDAVconnect runs on Hetzner in Germany and processes and stores your calendar data only in the EU. All event data is encrypted at rest.
Passwords and tokens are encrypted with AES-256-GCM, the key is held on a separate server, and calendar content is decrypted only in memory during a sync. Read the full security write-up
Frequently asked questions
CalDAV is an open internet standard for calendar synchronization (RFC 4791). It's used by self-hosted calendar servers like Nextcloud, SOGo, Radicale, and Baïkal. Unfortunately, Google Calendar can't connect to an external CalDAV server, and Microsoft 365 doesn't support CalDAV at all, which is where CalDAVconnect comes in.
About 5 minutes. Sign up, enter your CalDAV server URL and credentials, connect your Google or Microsoft account via OAuth, and select which calendars to sync. The first sync starts automatically.
The Outlook CalDAV Synchronizer is a COM Add-in that still works in Classic Outlook, but the new Outlook no longer supports COM Add-ins. As Microsoft rolls out New Outlook via Windows Update, it's increasingly becoming the default. CalDAVconnect is a cloud service that syncs server-to-server, so it works regardless of which Outlook version or email client you use.
Indirectly, yes. Calendly only reads availability from Google Calendar or Microsoft 365. By syncing your CalDAV calendar to Google Calendar within seconds via CalDAVconnect, Calendly always has up-to-date availability — eliminating the 12–48 hour delay from ICS feed subscriptions.
Changes in Google Calendar or Microsoft 365 appear in your CalDAV server within 1–2 seconds via webhooks. Changes in your CalDAV server sync to the cloud within 7–8 seconds on average via lightweight CTag polling — no full calendar scans.
CalDAVconnect has been tested with Nextcloud, SOGo, Radicale, Baïkal, Synology, Posteo, mailbox.org and Infomaniak. If your server supports the standard CalDAV protocol, it should work.
Yes. CalDAVconnect works with any Nextcloud installation that has the Calendar app enabled, including all versions of Nextcloud Hub. It connects directly to Nextcloud's CalDAV endpoint.
CalDAVconnect stores sync metadata and a cached copy of your event data to enable bidirectional sync. All event data is encrypted at rest. Our servers are located in Germany (Hetzner), and CalDAVconnect processes and stores your calendar data only in the EU. Events you sync to Google Calendar or Microsoft 365 are of course stored there as well.
CalDAVconnect syncs events from the last 90 days and all future events. Older events remain untouched on your CalDAV server — they simply won't be copied to Google Calendar or Microsoft 365. Recurring events that still have upcoming instances are always included, regardless of when they started.
Ready to sync your calendars?
Create your free account and set up your first sync in under 5 minutes.