Nexus-SecTech Ltd · Android
CallVault
A personal Android call recorder. Records both sides of a call as separate channels, keeps them on your phone, and backs them up to your own Google Drive.
What it does
Both sides, separately
Your voice and theirs are captured as distinct channels, so you can isolate either one — or listen to both together.
Verifiable
Every recording is stored with a SHA-256 hash and a sidecar describing the call. It is an audit tool, not a notes app.
Yours alone
No account, no server, no analytics. Backup goes to a folder in your own Drive using the narrowest scope Google offers.
How backup works
Backup is off until you choose a Google account. Once enabled, each recording and its
sidecar are uploaded to a CallVault folder in that account's Drive, straight
after the call rather than on a schedule — a phone lost an hour after an important call
should not take the only copy with it.
The app requests a single OAuth scope, drive.file, which grants access only
to files the app itself created. It cannot see anything else in your Drive.
googleapis.com is the only internet destination it contacts.
The law on recording calls varies by country and sometimes by state. Making sure it is lawful where you are — and that anyone entitled to be told has been told — is the responsibility of whoever operates the device.
Availability
CallVault is a private tool, distributed directly and not published on Google Play. It requires Android 11 or later and depends on Shizuku to capture call audio.