DAVKeep
Contacts and calendars from your own server — through a gate only your key opens.
DAVKeep is an Android sync provider for CalDAV and CardDAV. It fills the phone's own
Contacts and Calendar apps, so everything that reads them reads your server. There is no separate
address book to learn and nothing to open.
It exists for one case the usual clients do not cover: a DAV server behind an
identity-aware proxy. Each account can carry its own HTTP headers — a Cloudflare Access
service token, say — and its own client certificate, from the Android KeyChain or imported
from a .p12.
What it does
- Two-way sync: an edit made in the stock Contacts or Calendar app reaches the server.
- Per-account custom headers and mTLS, including servers that demand both.
- Write-back that patches the server's own vCard or
.ics, so properties Android
cannot model — X- fields, VTIMEZONE, alarms it does not understand —
survive an edit that never touched them.
- A Collection is read-only until you say otherwise.
It tells you when it fails
Silent failure is the thing this app is built against. Every run says what it did, in words, and
a sync that could not finish never claims it did:
ok written=1 deleted=0 uploaded=1 sent 1 edit to the server
WARN 1 edit was replaced by the server's version: the server's copy had changed
ERROR the server cut the listing short: nothing was deleted, and nothing was recorded
Get it
Android 7.0 and later. Sideload the APK; there is no Play listing.