Notion Calendar alternative for calendar sync: Keeper.sh

Notion Calendar is a free calendar app for Google, iCloud and Microsoft Outlook calendars, and its blocking feature puts a block on one calendar for events on another. Keeper.sh is the Notion Calendar alternative for people who want that sync without changing calendar apps, or whose calendars include Fastmail or a CalDAV server: Keeper.sh connects 5 kinds of calendar account, Fastmail and CalDAV servers among them. Keeper.sh is a calendar sync service that copies events between Google Calendar, Outlook, iCloud, Fastmail and any CalDAV server, so every calendar shows you as busy at the same times. It is free for 2 calendar accounts and 3 connections, and Pro is $5 a month for unlimited calendars.

The table compares Keeper.sh with Notion Calendar's blocking feature, and links each Notion Calendar figure to the Notion page it comes from.

How blocking works in Notion Calendar

Notion Calendar's blocking is set up from an event. On desktop or web, you right-click an event, select Block on calendar, pick the calendar that should receive the block, and choose "This event" or "All events from" that calendar. The second choice is what Notion calls auto-blocking: "all future events from your personal calendar will be blocked on your work calendar". You then choose "Include details" or "Show as busy" (Notion help: blocking).

Keeper.sh is set up from the calendars. You connect two accounts and add a connection from one calendar to the other, and every event inside the copy range is copied: one month back to two years ahead by default. Each connection runs one way, so two-way sync is two connections.

Which calendars each one connects

Notion Calendar "is compatible with Google, iCloud, and Microsoft Outlook calendars". Outlook calendars are not yet supported in Notion Calendar's mobile apps: the same page says "Mobile support for Microsoft Outlook calendars is coming soon" (Notion help). Notion Calendar cannot subscribe to a calendar link itself: "Subscribe to a calendar directly from Google Calendar, and it'll show up in Notion Calendar" (Notion help: calendars and events, checked 10 November 2026).

Keeper.sh connects Google Calendar, Outlook (Microsoft 365 and Outlook.com), iCloud, Fastmail and any CalDAV server such as Nextcloud. It also reads a pasted .ics link directly as a read-only source.

How often Keeper.sh updates

On Pro, Google and Outlook changes land within seconds, and iCloud, Fastmail and CalDAV changes land every minute. On Free, changes land every 30 minutes.

What each one costs

Notion Calendar is free: its product page says "Get Notion Calendar for free", and Notion's pricing page lists Notion Calendar on the Free plan (Notion pricing, checked 10 November 2026).

Keeper.sh has a Free plan and one paid plan, priced per person. Free covers 2 calendar accounts and 3 connections. Pro is $5 a month or $45 a year for unlimited calendars (pricing).

What a block shows

Notion Calendar asks at setup whether to "Include details" or "Show as busy", and applies that choice to future blocks when you auto-block.

Each Keeper.sh copy is a busy block named after the source calendar. The title, description and location are hidden by default, Pro can turn them back on per calendar, and guest lists are never copied.

What Notion Calendar offers beyond blocking

• A full calendar app. Notion Calendar runs on macOS, Windows, the web, iOS and Android (Notion help), with meetings to join from the menu bar and a view of your day across several time zones (Notion Calendar).
• Scheduling links. You can send your availability or a scheduling link that lets other people book time with you (Notion Calendar).
• Notion databases beside your events. Any Notion database with a date property can appear in the calendar, and items can be rescheduled by dragging them (Notion help: Notion Calendar with Notion, checked 10 November 2026).
• Per-event blocking. A single event can be blocked on another calendar without setting up anything for the rest.

Keeper.sh and Notion Calendar can be used together: Keeper.sh writes the busy blocks onto your Google, Outlook or iCloud calendar, and Notion Calendar displays that calendar like any other.

When Keeper.sh fits

• You want to keep your current calendar app. Keeper.sh works on the calendars themselves, so Apple Calendar, Outlook or Google Calendar shows the result.
• A calendar is on Fastmail, Nextcloud or another CalDAV server. Keeper.sh connects these directly.
• You want to filter what is copied. Pro can exclude all-day events, focus time and out-of-office events; the calendar sync features page lists the options.
• You want an assistant to manage sync. Keeper.sh has a REST API and an MCP server on both plans.

Create an account at Keeper.sh to add the first connection (sign up).

Step-by-step setup is in how to sync iCloud and Google Calendar and how to sync Google Calendar and Outlook.

Common questions about Notion Calendar and Keeper.sh

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