Keeper.sh

Open-Source Calendar Syncing for Google, Outlook & iCloud

What it does

Keep your personal, work, and school calendars in sync automatically. Open-source (AGPL-3.0) calendar syncing for Google Calendar, Outlook, iCloud, FastMail, and CalDAV.

Does the same job

all alternatives →

SavvyCal for iCloud2021 · ▲293
Scheduling links for iCloud, plus Google, Outlook, Fastmail
Outlook Google Calendar Sync for Mac16d ago · outlookgooglecalendarsyncmac.com · ▲83
Sync Outlook calendars to Google on your Mac
OneCal2023 · ▲125
Synchronise Outlook and Google Calendars
CalendarPipeApr 2026 · calendarpipe.com · ▲155
Programmable calendar sync for humans and AI agents
Notion Calendar Sync2021 · ▲283
2-way sync between Notion and your Google Calendar
ShadowCal2025 · ▲95
Sync your Outlook Calendar to Google Calendar

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