IN THE FIELD GUIDE
Keeper
keeper.sh
Keeper.sh is a calendar synchronization service that copies events between Google Calendar, Outlook, iCloud, and Fastmail to prevent double-booking by showing busy times across all calendars. It supports direct sign-in for major calendar providers and link-based connections for others, maintaining privacy by keeping event titles and details private unless enabled in Pro.
THE PRODUCT, BEYOND THE PITCH
Editorially reviewed · Sources checked Oct 7, 2026
A good fit for
- Users who need to keep multiple calendar accounts in sync to avoid scheduling conflicts.
- Users who want privacy by sharing only busy blocks without event details across calendars.
Know the limitations
- Free plan updates calendars every 30 minutes and limits to 2 linked accounts and 3 connections.
- Copying runs one way only; to sync two calendars bidirectionally, two connections must be set up.
What you can do
- Preventing double-booking by syncing busy times across personal, work, and school calendars.
- Allowing AI tools to manage calendar events such as booking and rescheduling.
Features
- Copies events between calendars to show busy times consistently across all connected calendars.
- Supports direct sign-in for Google Calendar, Outlook, iCloud, and Fastmail, and link pasting for other calendars.
- Allows AI agents to view and manage calendars via connection to MCP clients like Claude or Cursor.
- Open source under AGPL-3.0 license, with code available for self-hosting and transparency.
Integrations
- Integrates with Google Calendar, Outlook, iCloud, Fastmail, and any calendar supporting CalDAV or share links.
Platforms & data export
- Provides a single shareable calendar link that shows busy times without event details, subscribable from any calendar app.
THE COST FOR YOUR TEAM
Go beyond the starting price.
Published plan prices for your team size and usage. Results update as you type. Taxes, currency conversion and unlisted add-ons are excluded, and anything the source did not state is called out rather than guessed.
Cheapest fit for 1 person, all 1 tools
$0.00/month
$0.00 a year on these plans.
| Tool / plan | Monthly | Per year | What this assumes |
|---|---|---|---|
FreeCheapest fit Flat subscription | $0.00 | $0.00 | Automatically extracted from the linked pricing source. Seat allowances, usage limits, taxes and terms are not confirmed — check them with the provider. |
Pro Flat subscription | $5.00 | $60.00 | Automatically extracted from the linked pricing source. Seat allowances, usage limits, taxes and terms are not confirmed — check them with the provider. |
A practical workflow
- Connect a calendar by signing in or pasting a link, then specify the destination calendar for event copies.
- Choose what each calendar shows; copies start as busy blocks named after the source calendar, with Pro allowing more detail and filters.
- Keeper.sh keeps copies up to date; Pro uses push notifications for Google and Outlook changes, Free checks every minute and copies within 30 minutes.
Based on the sources below. Editorial review does not imply hands-on product testing.
Alternatives to explore
Filter alternatives →Candidates based on category and primary feature. Check feature and pricing differences before switching.
Plan a switch from Keeper →What changed
No changes recorded yet
Changes to the facts recorded here, not a live scan of every vendor update. Save this tool to follow updates in your account.
No changes recorded yet.
Comments
No comments yet. Be the first to say what Keeper costs you.