# Keeper.sh > Keeper.sh copies your events between Google Calendar, Outlook, Microsoft 365, iCloud, Fastmail and CalDAV calendars, so every one of them shows you as busy at the same times. Keeper.sh is for people whose commitments are split across accounts that cannot see one another — a work Outlook calendar, a personal Google one, a shared iCloud one. You pick which calendar's events are copied into which, and Keeper.sh writes a matching busy block on the other. Event titles, descriptions and locations stay behind by default, and guest lists are never copied on any plan. ## Key Features - Works with Google Calendar, Outlook, Microsoft 365, iCloud, Fastmail, any CalDAV server, and calendar links you paste in. Pasted links are read-only - A copy carries the calendar's name in place of the event title. Descriptions and locations are left behind too, and Pro lets you turn each one back on per calendar - Guest lists are never written to another calendar or to a shared link, on any plan - One shareable calendar link covering everything you connect, labelled "Busy" by default, and it opens in any calendar app - A REST API under `/api/v1` for calendars, accounts, events, invitations, free-time search and on-demand sync, using `kpr_` API tokens - An MCP server with fourteen tools over OAuth 2.1. An AI agent can read your week, book and amend events, RSVP, find open slots, and pause or force a sync - Open source under AGPL-3.0, with Docker Compose images you can run yourself - On Pro, Google and Outlook notify Keeper.sh as changes happen, so copies land within seconds. iCloud, Fastmail and other CalDAV calendars are read on a timer, because Apple publishes no way to be told an event changed - Free covers 2 calendar accounts, 3 connections and 1 shared link, reading every minute and copying every 30. Pro is $5 a month or $45 a year, unlimited, with Google and Outlook changes copied within seconds ## Links - [Homepage](https://www.keeper.sh) - [Features](https://www.keeper.sh/features) - [Pricing](https://www.keeper.sh/pricing) - [MCP Server & REST API Documentation](https://www.keeper.sh/docs/mcp) - [Blog](https://www.keeper.sh/blog) - [Compare](https://www.keeper.sh/compare) - [Docs](https://www.keeper.sh/docs) - [Guides](https://www.keeper.sh/guides) - [Recipes](https://www.keeper.sh/recipes) - [Privacy Policy](https://www.keeper.sh/privacy) - [Terms & Conditions](https://www.keeper.sh/terms) - [GitHub Repository](https://github.com/ridafkih/keeper.sh) - [Full LLM Context](https://www.keeper.sh/llms-full.txt) ## Setup Guides - [How to Sync Google Calendar with Outlook](https://www.keeper.sh/blog/sync-google-calendar-with-outlook): two-way sync, and what colleagues see in Outlook. - [How to Add Google Calendar to Outlook](https://www.keeper.sh/blog/add-google-calendar-to-outlook): the read-only route, and when it is enough. - [How to Add Google Calendar to iPhone](https://www.keeper.sh/blog/how-to-add-google-calendar-to-iphone): work meetings on your iPhone, with no work account. - [How to Sync Apple Calendar to Google Calendar](https://www.keeper.sh/blog/how-to-sync-apple-calendar-to-google-calendar): the Apple app password, and who sees titles. - [How to Sync iCloud Calendar with Outlook](https://www.keeper.sh/blog/sync-icloud-calendar-with-outlook): block personal time at work. - [How to Sync Fastmail Calendar with Google Calendar](https://www.keeper.sh/blog/sync-fastmail-calendar-with-google-calendar): the Fastmail app password, and what travels. - [How to Sync Fastmail Calendar with Outlook](https://www.keeper.sh/blog/sync-fastmail-calendar-with-outlook): app password first, then Microsoft 365. - [How to Sync Nextcloud Calendar with Google Calendar](https://www.keeper.sh/blog/sync-nextcloud-calendar-with-google-calendar): what the copies look like. - [How to Sync Nextcloud Calendar with Outlook](https://www.keeper.sh/blog/sync-nextcloud-calendar-with-outlook): the URL to paste, and tenant consent. - [How to Sync Radicale with iCloud Calendar](https://www.keeper.sh/blog/sync-radicale-with-icloud-calendar): the private-network setting that catches people out. - [How to Give Claude Access to Your Calendar (MCP)](https://www.keeper.sh/blog/how-to-give-claude-access-to-your-calendar-mcp): the five-minute setup, and what the consent screen asks for. ## Comparisons - [Best Calendar Sync Tools: 9 Compared on Price, Speed and Privacy](https://www.keeper.sh/compare/best-calendar-sync-tools): nine tools on price and privacy. - [Open-Source Calendar Sync Tools Compared](https://www.keeper.sh/blog/open-source-calendar-sync): the projects you can run yourself. - [Keeper.sh vs CalendarBridge](https://www.keeper.sh/compare/calendarbridge-alternative): pricing at eight calendars. - [Keeper.sh vs Kalender Sync](https://www.keeper.sh/compare/kalender-sync-alternative): EU contracting and update speed. - [Keeper.sh vs Morgen](https://www.keeper.sh/compare/morgen-alternative): update speed, data location, native apps. - [Keeper.sh vs OneCal](https://www.keeper.sh/compare/onecal-alternative): which calendars each connects. - [Keeper.sh vs Reclaim.ai](https://www.keeper.sh/compare/reclaim-ai-alternative): free-plan scope and cost. - [Keeper.sh vs SyncDate](https://www.keeper.sh/compare/syncdate-alternative): update speed, price and agent tools. - [Keeper.sh vs SyncThemCalendars](https://www.keeper.sh/compare/syncthemcalendars-alternative): two-way setup and pricing by count. ## Background - [How Calendar Sync Actually Works: Tokens, DST, Deletions](https://www.keeper.sh/blog/how-calendar-sync-actually-works): why changes arrive late, and repeating events. - [Stop Getting Double-Booked Across Google, Outlook and iCloud](https://www.keeper.sh/blog/why-i-built-an-open-source-calendar-syncing-tool): why the project exists, and what it costs. - [What an AI Agent Can Actually Do With Your Calendar](https://www.keeper.sh/blog/what-an-ai-agent-can-do-with-your-calendar): all fourteen MCP tools, and what is not on the list.