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Radicale

A small calendar and contacts server that keeps everything as plain files in a folder.

Instead of Google Calendar, Google Contacts

M · SystemOpen sourceSelf-hostablePlain files
radicale.org
Screenshot of the Radicale website

Screenshot from radicale.org, taken 2026-10-30, shown to help you recognise the tool. It belongs to its maker. Ask us to remove it.

Radicale is a calendar and contacts server so plain that you could back it up with a file copy. It shares calendars and address books over CalDAV and CardDAV, handles events, to-dos, journal entries and contacts, stores everything on the file system in a simple folder structure, and says it works out of the box with no complicated setup. It is GPLv3 free software and works with many CalDAV and CardDAV clients.

Radicale scores a 5 on lock-in, a 4 on footprint, power and longevity and a 3 on self-direction and delivery.

It is a server, so it has no phone app of its own, and you pair it with a client such as DAVx5 on Android. The page names no developers, no funding and no supported platforms, so Longevity and Power rest on the licence and the plain-files design.

    What stands out

  • Shares calendars and contacts over CalDAV and CardDAV
  • Stores everything as plain files in folders
  • A server only, so you need a client app
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For comparison, we also reviewed Google Calendar (16/30) as a benchmark.

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