DAVx⁵ has been successfully tested with Bitrix24.

Bitrix24 is a unified communication software and productivity tool for small businesses.

DAVx⁵ settings

Use "Login with URL/user name".

Base URL: https://<>/bitrix/groupdav.php/ (e.g.

Username: your email address

PW: your app-password (create a password in Profile → Password / Security → App passwords → Mobile App (+ Contacts + Calendar))

Address-book synchronization is one-way (Bitrix24 → Android) and will only synchronize employees (not customers).

To minimize problems please set the address book to "force read-only" inside your DAVx⁵ account.