What is Keeper.sh used for?

Keeper.sh is a calendar sync service that copies events between Google, Outlook, iCloud and Fastmail so every calendar shows you as busy. It is a good fit for keeping personal and work calendars from double-booking, and letting an AI assistant schedule and reschedule events.

Yes. Keeper.sh has a free plan, and paid plans start at $5 per seat per month.

Is Keeper.sh open source?

No. Keeper.sh is proprietary (closed-source) software. In the Scheduling category, open-source options include Easy!Appointments, Cal.diy and Rallly.

Can I self-host Keeper.sh?

Yes. Although Keeper.sh is closed source, it can be self-hosted on your own servers, and the vendor also offers a hosted version.

What are some alternatives to Keeper.sh?

Keeper.sh competes with Reclaim.ai, Clockwise and Morgen.

Keeper.sh: features, pricing and alternatives

About Keeper.sh

Keeper.sh mirrors events across personal, work and school calendars so that a booking in one place blocks the same time in all the others. It works with Google Calendar, Outlook, iCloud and Fastmail through direct sign-in, and other calendars can be linked by pasting a calendar link. The aim is to stop double bookings across separate accounts.

Each copy starts as a busy block named after its source calendar, so titles, descriptions, locations and guest lists stay private. Paid users can turn those details back on and add filters to skip certain events. After you connect calendars once and point each one at a destination, the service keeps the copies current in the background.

Keeper.sh also exposes your calendar to AI agents: Claude or any MCP client can check your week, book events and reschedule. The code is public, so you can inspect what is sent to your calendars or host it yourself. A hosted version with a free plan and a Pro plan is available, and the free plan checks for updates every 30 minutes.

Key features

Copies events between Google, Outlook, iCloud and Fastmail
Busy blocks that hide titles and guest lists
Link any calendar by pasting its URL
Optional sync of title, description and location
Filters to skip selected events
MCP server for AI agents to manage calendars
Open code you can run on your own server

Good fit for

Keeping personal and work calendars from double-booking
Letting an AI assistant schedule and reschedule events

Tags: calendar-sync; google-calendar; outlook; icloud; scheduling; mcp; self-hosted

Keeper.sh: questions and answers

What is Keeper.sh used for?: Keeper.sh is a calendar sync service that copies events between Google, Outlook, iCloud and Fastmail so every calendar shows you as busy. It is a good fit for keeping personal and work calendars from double-booking, and letting an AI assistant schedule and reschedule events.
Is Keeper.sh free?: Yes. Keeper.sh has a free plan, and paid plans start at $5 per seat per month.
Is Keeper.sh open source?: No. Keeper.sh is proprietary (closed-source) software. In the Scheduling category, open-source options include Easy!Appointments, Cal.diy and Rallly.
Can I self-host Keeper.sh?: Yes. Although Keeper.sh is closed source, it can be self-hosted on your own servers, and the vendor also offers a hosted version.
What are some alternatives to Keeper.sh?: Keeper.sh competes with Reclaim.ai, Clockwise and Morgen.