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Keeper.sh

Open-source calendar sync that marks you busy across Google, Outlook, iCloud, and Fastmail

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Aboutkeeper.sh

Keeper.sh copies events between personal, work, and school calendars so all of them show you as busy at the same times. It supports Google Calendar, Outlook, iCloud, Fastmail, and CalDAV, and event titles stay private. It is open source under the AGPL-3.0 license, with a hosted plan.

For an agent

Use it to stop double-booking across several calendars. Self-host it if you do not want a third party to see your calendars.

Why it is here. It solves a common scheduling problem with a privacy-first approach.

Install command, framework, licence and component list.
Notable for
  • Busy-time sync
  • Private titles
  • AGPL-3.0
Provenance

Verified 2026-10-09. HTTP 200. https://www.keeper.sh/ (HTTP 200, page fetched 2026-10-09), https://github.com/ridafkih/keeper.sh (GitHub API, 1381 stars), depo.zip listing https://www.depo.zip/tools/j576spknp9byg66aqvrr54w92n84pthc

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