keeper.sh
Active·★ 1.1k·AGPL-3.0·Updated 2026-05-26
★ Hidden Gem★ API Integration
Open-source calendar sync tool. Aggregate events from Google, Outlook, iCloud & CalDAV into one anonymized feed.
Keeper aggregates events from remote iCal/ICS URLs and pushes them to multiple calendars to align time slots. It is easy to self-host and open source under AGPL-3.0.
#bun#caldav#calendar#calendar-sync#google-calendar#ical#icloud#ics
01
Features
01Aggregating calendar events from remote sources
02Event content agnostic syncing engine
03Push aggregate events to one or more calendars
04Open source under AGPL-3.0
05Easy to self-host
02
Compatibility
Google Calendar
Google Calendar
Verified via docs
Microsoft Outlook
Outlook
Verified via docs
CalDAV
CalDAV
Verified via docs
Fastmail
Fastmail
Verified via docs
iCloud
iCloud
Verified via docs
03
Quick start
1
$ BETTER_AUTH_SECRET=$(openssl rand -base64 32) ENCRYPTION_KEY=$(openssl rand -base64 32) docker run -d -p 80:80 -v keeper-data:/var/lib/postgresql/data -e BETTER_AUTH_SECRET -e ENCRYPTION_KEY ghcr.io/ridafkih/keeper-standalone:latest
04
Use cases
↳Synchronize multiple personal calendars (e.g., work and personal) to avoid double-booking
↳Aggregate team calendars from different sources into one view
↳Maintain calendar consistency across different platforms
05
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Comments
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- SSage PatelMay 20, 2026
Used for unified scheduling across multiple calendar accounts. Reliable sync.
- SShawn ThompsonMay 19, 2026
Cross-calendar aggregation without sharing actual event details is the right privacy model.
- LLogan HarrisApr 23, 2026
Open-source calendar sync that works with the calendar providers people actually use.
- RReese RiveraMar 23, 2026
Aggregate Google, Outlook, iCloud, and CalDAV into one anonymized calendar feed — privacy-preserving unification.