Radicale
Simple calendar and contact server with extremely low administrative overhead.
Best self-hosted Calendar & Contacts software in 2026
CalDAV and CardDAV protocol servers and web clients/interfaces for Electronic calendar, address book and contact management.
We track 10 open-source, self-hosted Calendar & Contacts apps. 9 of them had commits in the last 90 days, 3 can run with Docker, and the most common licenses are GPL-3.0 (4), MIT (3), GPL-2.0 (2). The most-used languages are PHP, Python, Java. Below are the top picks by GitHub stars, followed by every app ranked by stars weighted by maintenance health.
Top 5 by GitHub stars
| # | App | Stars | Health | Last activity | License | Language | Docker |
|---|---|---|---|---|---|---|---|
| 1 | Radicale | 5.2k | Active | 2026-11-08 | GPL-3.0 | Python, deb | – |
| 2 | Baïkal | 3.4k | Active | 2026-11-03 | GPL-3.0 | PHP | – |
| 3 | SabreDAV | 1.7k | Active | 2026-11-01 | MIT | PHP | – |
| 4 | Keeper.sh | 1.5k | Active | 2026-11-09 | AGPL-3.0 | Docker | ✓ |
| 5 | DavMail | 775 | Active | 2026-11-09 | GPL-2.0 | Java | – |
- Radicale — Simple calendar and contact server with extremely low administrative overhead.
- Baïkal — Lightweight CalDAV and CardDAV server based on sabre/dav.
- SabreDAV — CardDAV, CalDAV, and WebDAV framework and server.
- Keeper.sh — Calendar syncing tool that pulls and pushes events between calendar sources and destinations via iCal/ICS or OAuth, with support for anonymized busy/free events.
- DavMail — POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.
Head-to-head comparisons
Baïkal vs RadicaleRadicale vs SabreDAVKeeper.sh vs RadicaleBaïkal vs SabreDAVBaïkal vs Keeper.shKeeper.sh vs SabreDAV
All 10 self-hosted Calendar & Contacts apps
Ranked by GitHub stars weighted by maintenance health.
Baïkal
Lightweight CalDAV and CardDAV server based on sabre/dav.
SabreDAV
CardDAV, CalDAV, and WebDAV framework and server.
Keeper.sh
Calendar syncing tool that pulls and pushes events between calendar sources and destinations via iCal/ICS or OAuth, with support for anonymized busy/free events.
DavMail
POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.
Davis
Simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal.
Manage My Damn Life
Manage my Damn Life (MMDL) is a front end for managing your CalDAV tasks and calendars.
Xandikos
CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository.
dayGLANCE
Day planner with drag-and-drop time blocking, inbox, recurring tasks, habits, routines, goals, projects and Pomodoro focus mode, plus iCal and CalDAV calendar sync. Data stays in the browser, with optional WebDAV or GLANCEvault sync.
DAViCal
Server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store.
Frequently asked questions
What is the best self-hosted Calendar & Contacts software in 2026?
By GitHub stars, the most popular self-hosted Calendar & Contacts apps are Radicale (5,201 stars), Baïkal (3,370 stars), SabreDAV (1,728 stars). Popularity is only one signal: also check maintenance health, license and whether it fits your setup.
How many self-hosted Calendar & Contacts apps are actively maintained?
9 of the 10 apps listed had commits in the last 90 days and 1 more in the last 12 months.
Which self-hosted Calendar & Contacts apps can I run with Docker?
3 of the 10 apps can run with Docker.
Which licenses do self-hosted Calendar & Contacts apps use?
The most common licenses in this category are GPL-3.0 (4 apps), MIT (3 apps), GPL-2.0 (2 apps).
How much does it cost to self-host Calendar & Contacts software?
The software itself is free to download. Based on our rough hardware estimates, the cheapest suitable VPS plan starts at about $5/month (median $5/month across apps in this category). Several light apps can share one server.
Related categories
Figures from GitHub and Docker Hub as of 2026-11-15; hosting costs are rough estimates.