# sabre-io/Baikal

Baïkal is a Calendar+Contacts server

Repository: https://github.com/sabre-io/Baikal
Canonical: https://ross.abutalabs.com/products/baikal
Homepage: https://sabre.io/baikal/
Language: PHP
License: GPL-3.0
License Family: copyleft
Last push: 2026-08-13T20:02:23+00:00

## Health v2 (maintenance only)
Score: 97/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 96, longevity 100
- inputs: {"age_days": 5301, "days_push": 20, "days_rel": 28, "gap_med": 7, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3279, forks 317 (observed 2026-08-28T04:07:53.550452+00:00)

## What it is
Baïkal is a lightweight, self-hosted CalDAV and CardDAV server built on sabre/dav for PHP. It provides a web admin interface for managing users, calendars, and address books, with data stored in MySQL, PostgreSQL, or SQLite.

## Use cases
- self-host my calendars and contacts
- sync calendar with iPhone and Android via CalDAV
- host a CardDAV address book server
- replace Google Calendar with a private server
- share calendars across Thunderbird and mobile devices
- run a lightweight DAV server on a Raspberry Pi

## When to choose
- you want a simple, lightweight CalDAV/CardDAV server with a web admin UI
- you want to self-host contacts and calendars for privacy
- you only have a basic PHP-capable server with MySQL, PostgreSQL, or SQLite
- you need compatibility with iOS, macOS, Android (DAVx5), and Thunderbird

## When to avoid
- you need full groupware features like email or file sharing (use Nextcloud or Radicale alternatives)
- you don't want to run a PHP web server
- you need an officially supported Docker image (only community images exist)
- you need a managed/hosted solution

## Facets
- artifact type: application
- maturity: active
- function: http-server, web-framework, auth, database
- domain: self-hosted, privacy, web-development, developer-tools
- platform: php, self-hosted
- tags: caldav, carddav, dav, calendar-server, contacts-server, sabre-dav, web-interface, sqlite, mysql, postgresql, linux, web-server, docker

## Member repositories
- sabre-io/Baikal (main) score 97

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:53.550452+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 2026-08-29T18:43:21.012197+00:00, confidence not recorded.
  - readme: https://github.com/sabre-io/Baikal (fetched 2026-08-28T04:07:53.550452+00:00, sha 1e0427437b80)
  - homepage: https://sabre.io/baikal/ (fetched 2026-08-29T09:36:09.229077+00:00, sha dc8e62f9eacf)
  - site_page: https://sabre.io/baikal/install (fetched 2026-08-29T09:36:09.233080+00:00, sha df409974e6da)
  - site_page: https://sabre.io/baikal/docker-install (fetched 2026-08-29T09:36:09.234971+00:00, sha a24df2a552df)
  - site_page: https://sabre.io/dav (fetched 2026-08-29T09:36:09.231410+00:00, sha 36324f5151d7)
- Data as of 2026-08-30T08:39:29.467469+00:00.