DeltaSync

Hans Bjørck-Braun | Cloud Storage & File Sync

8 Downloads 16 Views v0.4 23.44 MB 4.1+

Download APK

(23.44 MB)

Editor's Overview

DeltaSync is a cloud storage & file sync application developed by Hans Bjørck-Braun, packaged as a single Android APK of version 0.4 weighing in at 23.44 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

Install Checklist

Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
File size is a light 23.44 MB, so it installs quickly even on modest connections.
This build is signed by "Hans Bjørck-Braun" — always verify the developer name matches what's listed on the app's official store page before installing an update.
After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

About this app

⚠ REQUIRES YOUR OWN SERVER. DeltaSync does nothing on its own. You must first
install and run the self-hosted DeltaSync server (PHP + PostgreSQL), or have
access to someone else's, and enrol this device against it. There is no public
or default server — without one, this app has nothing to sync and cannot even
be set up. If you just want a standalone KeePass app, this is not it: use
KeePass2Android or KeePassDX instead.

DeltaSync keeps a KeePass (.kdbx) database synchronised across your devices
through a server that only ever sees encrypted blobs. Your master password
never leaves the device, and the server cannot read entry titles, usernames,
passwords, notes or attachments — even if it is compromised.

How it differs from other KeePass sync solutions:

• Entry-level deltas: only changed entries cross the wire, not the whole
.kdbx file. Fewer bytes uploaded, fewer wholesale conflicts.

• Real end-to-end encryption: per-entry XChaCha20-Poly1305 with a key
derived from your master password via Argon2id and HKDF-SHA256. The
server stores opaque ciphertext.

• Concurrent edits merge: two devices editing different entries (or even
different fields of the same entry) merge cleanly. Field-level
last-writer-wins on conflicts.

• Multi-user sharing without key escrow: NaCl sealed-box wraps the
database master key to each recipient's device public key. The server
sees who has access, not what they can decrypt.

• Open source from end to end: the AGPL-3.0 server (PHP/PostgreSQL),
GPL-3.0 desktop client (Go), and this GPL-3.0 Android client are all
published. You can self-host the server, or use someone else's.

This app pairs with KeePass2Android or KeePassDX as your editor — DeltaSync
itself is a background sync service and does not display your passwords.
You point it at a .kdbx file on the device, supply the master password
once, and it keeps the file in sync with the server through WorkManager.

Project: https://gitlab.com/Star95/keepass-deltasync
Website: https://deltasync.bjoerck-braun.dk

Groups sync too: group structure and which group each entry belongs to stay
in sync across devices, alongside the entry contents.

Status: v0.4 — the sync layer (entries + groups) is feature-complete and
tested; the UI is functional but still minimal. Treat as beta.

Details

Version	v0.4
Size	23.44 MB
Developer	Hans Bjørck-Braun
Category	Cloud Storage & File Sync
Package	dk.bjoerckbraun.deltasync
Android	4.1+
Last Updated	Oct 28, 2026
Downloads	8

Frequently Asked Questions

Is DeltaSync free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does DeltaSync require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is DeltaSync safe to install?
We link to the exact APK published by Hans Bjørck-Braun. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update DeltaSync?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

How to Download & Install DeltaSync

Tap the Download APK button above and save the file to your device.
Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
Open the downloaded dk.bjoerckbraun.deltasync.apk file from your Downloads folder.
Tap Install and wait for Android to finish.
Open «DeltaSync» by Hans Bjørck-Braun and grant only the permissions it actually needs.
Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.