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Musubi
Musubi · Brno, Czech Republic
What it is
Musubi is a shared calendar that combines calendars, tasks, people, and reminders. Events can appear in multiple calendars, with one update reflected in each appearance. Connections include Google Calendar, Apple iCloud, Outlook, Microsoft 365, and compatible CalDAV services such as Nextcloud, Fastmail, and Radicale. Synchronization works both ways where provider permissions allow, while read-only calendars remain read-only. Day, week, month, and agenda views are available, and personal pages control which calendars and items are shown. Tasks sit beside events with status, priority, and due dates; the web version adds list and Kanban views. Android and iOS apps are available, with Android agenda and month widgets and on-device event reminders. Musubi is open source under the MIT License and can be self-hosted using Docker Compose v2, a domain, and HTTPS. Hosted Musubi is free during early access at no cost. The hosted app and primary database run in Germany. Musubi says it is not end-to-end encrypted because shared-calendar synchronization requires server access to event data.
For and against
For
- Syncs with Google, Apple, Microsoft, and CalDAV
- Links events across multiple calendars
- Includes shared tasks and reminders
- Offers Android and iOS apps
- Open source and self-hostable
Against
- Not end-to-end encrypted
- Product is still evolving and may contain bugs
- Self-hosting requires Docker Compose, domain, and HTTPS
- Hosted plan is early access
The verdict
Musubi combines cross-provider calendar sync with shared tasks, reminders, and mobile apps. Its open-source, self-hosted option adds flexibility, while the lack of end-to-end encryption and early-access status deserve attention.
Who it suits
Musubi suits people coordinating shared schedules and tasks across several calendar providers. It also fits users who want open-source software, mobile apps, or a self-hosted deployment.
Plans and prices
Hosted Musubi (early access)
Free during early access
Read 8 Oct 2026 · musubi.pro
On the record
- Calendar sync
- two_waymusubi.pro · read 22 Sep 2026
- Calendar views
- The product offers day, week, month, and agenda views, with personal pages for choosing which calendars and items to show.musubi.pro · read 8 Oct 2026
- Early access
- Musubi is still evolving, and the maker says features may change and users may encounter bugs.musubi.pro · read 8 Oct 2026
- Integrations
- Musubi connects to Google Calendar, Apple iCloud, Outlook and Microsoft 365, and compatible CalDAV services such as Nextcloud, Fastmail, and Radicale.musubi.pro · read 8 Oct 2026
- Linked events
- An event can appear in multiple calendars and be updated once wherever it appears.musubi.pro · read 8 Oct 2026
- Mobile apps
- ios and androidmusubi.pro · read 22 Sep 2026
- Mobile features
- The Android app offers agenda and month widgets, and event reminders are scheduled on the device.musubi.pro · read 8 Oct 2026
- Open source
- Musubi is open source under the MIT License and can be self-hosted.musubi.pro · read 8 Oct 2026
- Privacy
- Musubi says it does not sell calendar data or use connected calendar and task data for advertising or AI training.musubi.pro · read 8 Oct 2026
- Purpose
- Musubi is a shared calendar for everyday life that brings calendars, tasks, and people together.musubi.pro · read 8 Oct 2026
- Security
- The hosted app and primary database run in Germany, connections use HTTPS/TLS, and certain provider credentials receive application-level authenticated encryption.musubi.pro · read 8 Oct 2026
- Security limitation
- Musubi states that it is not end-to-end encrypted because shared calendars and cross-provider sync require the server to read event data.musubi.pro · read 8 Oct 2026
- Self-hosting requirements
- Self-hosting uses Docker Compose v2, a domain, and HTTPS; the stack includes the web app, API, Postgres, and Caddy gateway.musubi.pro · read 8 Oct 2026
- Shared calendars
- Users can invite selected people to a shared calendar and grant view or edit access.musubi.pro · read 8 Oct 2026
- Support
- The maker says product questions and support requests can be sent by email, and it also provides feedback and community links.musubi.pro · read 8 Oct 2026
- Sync limits
- Changes sync both ways where the provider and permissions allow, while read-only calendars remain read-only.musubi.pro · read 8 Oct 2026
- Tasks
- Tasks can be tracked alongside events, with status, priority, due dates, and list or Kanban views on the web.musubi.pro · read 8 Oct 2026
