DAVx5 vs vdirsyncer
A side-by-side comparison of two self-hosted calendar & contacts options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | DAVx5 | vdirsyncer |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 87 · Excellent | 66 · Good |
| Category | Calendar & Contacts | Calendar & Contacts |
| License | GPL-3.0 | BSD-3-Clause |
| Language | Kotlin | Python |
| Setup difficulty | Easy | Medium |
| Min. RAM | 128 MB | 64 MB |
| Deployment | binary, source | binary, source |
| GitHub stars | ★ 2,896 | ★ 1,879 |
| First released | 2013 | 2014 |
| Replaces | Google Calendar Sync, iCloud sync | iCloud sync |
What are DAVx5 and vdirsyncer?
DAVx5
DAVx5 is an open-source CalDAV and CardDAV synchronization client for Android, written in Kotlin. It connects the native Android calendar, contacts, and tasks apps to any compatible server, such as Nextcloud or Radicale, for two-way sync.
- CalDAV and CardDAV sync
- Native Android integration
- Two-way synchronization
- Works with any server
vdirsyncer
vdirsyncer is a command-line tool that synchronizes calendars and address books between a local storage and CalDAV/CardDAV servers. It is commonly used to keep self-hosted calendar data in sync with local clients.
- Sync calendars and contacts
- CalDAV and CardDAV support
- Pairs with khal and other clients
DAVx5 vs vdirsyncer: key differences
DAVx5 is written in Kotlin, while vdirsyncer is built with Python. Licensing differs — GPL-3.0 for DAVx5 versus BSD-3-Clause for vdirsyncer. Vdirsyncer is the lighter option, starting around 64 MB of RAM against 128 MB for DAVx5.
Why pick each one
Choose DAVx5 if…
- Released under the GPL-3.0 license
- Easy to set up — beginner-friendly
- Active community (2.9k GitHub stars)
- Written in Kotlin
Choose vdirsyncer if…
- Released under the BSD-3-Clause license
- Active community (1.9k GitHub stars)
- Written in Python
- Tiny footprint — runs in 64 MB RAM
Frequently asked questions
Is DAVx5 or vdirsyncer better?
DAVx5 is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider vdirsyncer if its specific feature set fits your needs better.
Are DAVx5 and vdirsyncer free and open-source?
Yes. DAVx5 is licensed under GPL-3.0 and vdirsyncer under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run DAVx5 and vdirsyncer with Docker?
DAVx5: check the project docs for container support. vdirsyncer: check the project docs for container support.
Which is lighter on resources, DAVx5 or vdirsyncer?
vdirsyncer has the smaller minimum footprint at 64 MB of RAM, compared to about 128 MB for DAVx5. Real-world usage depends on library size, user count, and enabled features.