# Kozea/Radicale

A simple CalDAV (calendar) and CardDAV (contact) server.

Repository: https://github.com/Kozea/Radicale
Canonical: https://ross.abutalabs.com/products/radicale
Homepage: https://radicale.org
Language: Python
License: GPL-3.0
License Family: copyleft
Topics: python, caldav, icalendar, carddav
Last push: 2026-08-24T18:57:01+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 96, longevity 100
- inputs: {"age_days": 5501, "days_push": 9, "days_rel": 27, "gap_med": 17.5, "n_releases_24m": 29}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4931, forks 521 (observed 2026-08-28T04:09:02.620139+00:00)

## What it is
Radicale is a lightweight CalDAV and CardDAV server for sharing calendars, to-do lists, and contacts over HTTP. It stores data on the file system, requires minimal setup, and supports authentication, TLS, and plugins.

## Use cases
- self-host a calendar server to sync events across devices
- share contact lists between phone and laptop via CardDAV
- sync to-do lists and journal entries with CalDAV clients
- serve calendars over HTTP with authentication and TLS
- store calendar and contact data in a simple file-based backend
- extend a groupware setup with a small CalDAV/CardDAV component

## When to choose
- you want a simple, lightweight CalDAV/CardDAV server with minimal configuration
- you prefer file-based storage without a database dependency
- you need a free, GPLv3 self-hosted sync server compatible with many clients
- you want to extend server behavior with plugins

## When to avoid
- you need a full groupware suite with email, webmail, or shared collaboration features
- you require advanced multi-user admin tooling or a web UI out of the box
- you need horizontal scaling with clustered storage

## Facets
- artifact type: service
- maturity: stable
- function: http-server, auth, security, plugin-system, self-hosted
- domain: self-hosted, developer-tools, backend, web-development
- platform: python, cross-platform, self-hosted
- tags: caldav, carddav, calendar-server, contacts-server, vcard, icalendar, sync, linux

## Member repositories
- Kozea/Radicale (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:02.620139+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:17:58.627684+00:00, confidence not recorded.
  - readme: https://github.com/Kozea/Radicale (fetched 2026-08-28T04:09:02.620139+00:00, sha f1063c942a5a)
  - homepage: https://radicale.org (fetched 2026-08-29T08:59:36.795398+00:00, sha 13000ea5d362)
- Data as of 2026-08-30T08:39:29.467469+00:00.