Musubi
by Musubi
What Musubi is
Musubi is a shared calendar that brings calendars, tasks, and people together for everyday life. An event can appear in multiple calendars, with changes reflected wherever it appears. It connects to Google Calendar, Apple iCloud, Outlook, Microsoft 365, and compatible CalDAV services such as Nextcloud, Fastmail, and Radicale. Two-way sync works where provider settings and permissions allow, while read-only calendars stay read-only. Views include day, week, month, and agenda, and personal pages let users choose which calendars and items to show. Tasks can sit alongside events with a status, priority, and due date; the web app provides list and Kanban views. Musubi has iOS and Android apps, shared tasks, and reminders. Android also offers agenda and month widgets, with event reminders scheduled on the device. The software is open source under the MIT License and can be self-hosted. Hosted Musubi is free during early access. Its hosted app and primary database run in Germany, but Musubi says the service is not end-to-end encrypted because the server must read event data for sharing and cross-provider sync.
Who it suits
Musubi suits people who want shared calendars and tasks connected across calendar providers. It also suits users who want an open-source option they can self-host, provided they can manage the required setup.
What it does well
- Connects to Google, Apple, Outlook, Microsoft 365, and CalDAV
- Events can appear across multiple calendars
- Tasks include status, priority, and due date
- Open source under the MIT License
What to know first
- Not end-to-end encrypted
- Read-only calendars remain read-only
- Self-hosting requires Docker Compose v2, a domain, and HTTPS
- Features may change and bugs may occur during early access
Limits
The hosted plan is free during early access, when features may change and users may encounter bugs. Self-hosting requires Docker Compose v2, a domain, and HTTPS. Sync changes only in both directions where provider support and permissions allow; read-only calendars remain read-only.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Hosted Musubi (early access) | Free during early access | Free |
As musubi.pro lists them, read 8 Oct 2026. The maker's own page has the final word.
Getting started
- Open https://musubi.pro/ to use the hosted service or find its self-hosting route.
- Use the hosted version, which is free during early access, or prepare Docker Compose v2, a domain, and HTTPS to self-host.
- Connect Google Calendar, Apple iCloud, Outlook, Microsoft 365, or a compatible CalDAV service.
- Choose calendar views and select which calendars and items to show on personal pages.
- Add tasks with a status, priority, or due date, and use the web list or Kanban view.
Verdict
Musubi combines calendar connections, shared events, tasks, and mobile apps, and it is free during early access. Its server needs to read event data for sharing and sync, so the service is not end-to-end encrypted.
Questions
Is Musubi free?
Yes. Hosted Musubi is listed as free during early access.
Is Musubi open source?
Yes. It is open source under the MIT License and can be self-hosted.
Which calendar services does Musubi connect to?
It connects to Google Calendar, Apple iCloud, Outlook, Microsoft 365, and compatible CalDAV services including Nextcloud, Fastmail, and Radicale.
Does calendar sync work both ways?
Changes sync both ways when the provider and permissions allow. Read-only calendars remain read-only.
What platforms are available?
Musubi lists web, Android, iOS, and self-hosted platforms.
Does Musubi use end-to-end encryption?
No. Musubi says the server needs to read event data to support shared calendars and cross-provider sync.
Facts from Musubi's own pages
- Calendar sync
- two_way · musubi.pro, 22 Sept 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, 8 Oct 2026
- Early access
- Musubi is still evolving, and the maker says features may change and users may encounter bugs. · musubi.pro, 8 Oct 2026
- Free plan
- Yes · musubi.pro, 22 Sept 2026
- Headquarters
- Brno, Czech Republic · musubi.pro, 28 Sept 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, 8 Oct 2026
- Linked events
- An event can appear in multiple calendars and be updated once wherever it appears. · musubi.pro, 8 Oct 2026
- Mobile apps
- ios and android · musubi.pro, 22 Sept 2026
- Mobile features
- The Android app offers agenda and month widgets, and event reminders are scheduled on the device. · musubi.pro, 8 Oct 2026
- Open source
- Musubi is open source under the MIT License and can be self-hosted. · musubi.pro, 8 Oct 2026
- Platforms
- The desktop web app and Android app are available; iOS is in beta through TestFlight. · musubi.pro, 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, 8 Oct 2026
- Purpose
- Musubi is a shared calendar for everyday life that brings calendars, tasks, and people together. · musubi.pro, 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, 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, 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, 8 Oct 2026
- Shared calendars
- Users can invite selected people to a shared calendar and grant view or edit access. · musubi.pro, 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, 8 Oct 2026
- Sync limits
- Changes sync both ways where the provider and permissions allow, while read-only calendars remain read-only. · musubi.pro, 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, 8 Oct 2026
Where Musubi stands on Freedom251
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