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SPECIFICTION
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Musubi

musubi.pro

Free plan WebiOSAndroidSelf-hosted
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Spec score 8.6 #37 of 194 in Calendar apps

What it is

Musubi is a shared calendar that combines calendars, tasks, and people for everyday planning. Events can appear in multiple calendars, with one update reflected wherever they are shown. It connects with Google Calendar, Apple iCloud, Outlook, Microsoft 365, and compatible CalDAV services including Nextcloud, Fastmail, and Radicale. Synchronization works both ways where provider permissions allow, while read-only calendars remain read-only. Views cover day, week, month, and agenda formats, and personal pages control which calendars and items appear. Tasks sit beside events with status, priority, due dates, and web list or Kanban views. Android and iOS apps provide mobile access; Android adds agenda and month widgets, with reminders scheduled on the device. Musubi is open source under the MIT License and can be self-hosted with Docker Compose v2, a domain, and HTTPS. Hosted Musubi costs nothing during early access. The hosted app and primary database run in Germany.

Spec sheet

Purpose
Musubi is a shared calendar for everyday life that brings calendars, tasks, and people together.Read 8 Oct 2026 · musubi.pro
Platforms
The desktop web app and Android app are available; iOS is in beta through TestFlight.Read 8 Oct 2026 · musubi.pro
Free plan
YesRead 22 Sep 2026 · musubi.pro
Integrations
Musubi connects to Google Calendar, Apple iCloud, Outlook and Microsoft 365, and compatible CalDAV services such as Nextcloud, Fastmail, and Radicale.Read 8 Oct 2026 · musubi.pro
Mobile apps
ios and androidRead 22 Sep 2026 · musubi.pro
Security
The hosted app and primary database run in Germany, connections use HTTPS/TLS, and certain provider credentials receive application-level authenticated encryption.Read 8 Oct 2026 · musubi.pro
Privacy
Musubi says it does not sell calendar data or use connected calendar and task data for advertising or AI training.Read 8 Oct 2026 · musubi.pro
Support
The maker says product questions and support requests can be sent by email, and it also provides feedback and community links.Read 8 Oct 2026 · musubi.pro
Headquarters
Brno, Czech RepublicRead 28 Sep 2026 · musubi.pro
Calendar sync
two_wayRead 22 Sep 2026 · musubi.pro
Calendar views
The product offers day, week, month, and agenda views, with personal pages for choosing which calendars and items to show.Read 8 Oct 2026 · musubi.pro
Early access
Musubi is still evolving, and the maker says features may change and users may encounter bugs.Read 8 Oct 2026 · musubi.pro
Linked events
An event can appear in multiple calendars and be updated once wherever it appears.Read 8 Oct 2026 · musubi.pro
Mobile features
The Android app offers agenda and month widgets, and event reminders are scheduled on the device.Read 8 Oct 2026 · musubi.pro
Open source
Musubi is open source under the MIT License and can be self-hosted.Read 8 Oct 2026 · musubi.pro
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.Read 8 Oct 2026 · musubi.pro
Self-hosting requirements
Self-hosting uses Docker Compose v2, a domain, and HTTPS; the stack includes the web app, API, Postgres, and Caddy gateway.Read 8 Oct 2026 · musubi.pro
Shared calendars
Users can invite selected people to a shared calendar and grant view or edit access.Read 8 Oct 2026 · musubi.pro
Sync limits
Changes sync both ways where the provider and permissions allow, while read-only calendars remain read-only.Read 8 Oct 2026 · musubi.pro
Tasks
Tasks can be tracked alongside events, with status, priority, due dates, and list or Kanban views on the web.Read 8 Oct 2026 · musubi.pro

Plans and prices

Hosted Musubi (early access) Free Free during early access Read 8 Oct 2026 · musubi.pro

Every Musubi plan and price →

Strong points and limits

Strong points

  • Two-way calendar sync where providers and permissions allow
  • Links events across multiple calendars
  • Includes shared tasks, reminders, and Kanban views
  • Offers Android and iOS apps
  • Open source under the MIT License

Limits

  • Not end-to-end encrypted
  • Self-hosting requires Docker Compose, a domain, and HTTPS
  • Product is still evolving and may contain bugs
  • Read-only calendars cannot be edited

Who it suits

Musubi suits households or groups coordinating shared schedules, tasks, and reminders across calendar providers. It also fits users who want open-source software or self-hosting options.

Verdict

Musubi brings shared calendars, tasks, reminders, and cross-provider synchronization into one service. Its free early-access hosting and self-hosting support are useful, but the product notes that encryption is not end-to-end and features may change.

Where Specifiction places it

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