CallVault: record both sides of your calls

Setup

Set up in four steps

1. 01

   Install CallVault

   Tap Download above and open the APK. When Android asks, allow installs from your browser.

2. 02

   Install Shizuku (the thedjchi build)

   Get it from github.com/thedjchi/Shizuku/releases. Shizuku is what lets CallVault reach the call audio itself, instead of recording the speaker through the microphone.

3. 03

   Start Shizuku

   Turn on Developer options and Wireless debugging, start Shizuku from its app, and switch on its start-on-boot option so you don't have to repeat this after a restart.

4. 04

   Open CallVault

   Allow Shizuku when asked and pick a folder for your recordings. From then on, calls record automatically.

Good to know

• ✓Android 11 or newer. SIM calls work from Android 11; WhatsApp and Wi-Fi Calling recording needs Android 14 or newer. Tested on a Galaxy S26 Ultra running Android 17.
• ✓Recordings stay on your phone. The app has no internet permission, and files are small Opus audio in a folder you choose.
• ✓Built-in player and manager: search by name or number, play at up to 2x, share or delete, with calls from the same person grouped in folders.
• ✓Check your local law before recording. Some places require the other person's consent.

How it works, and why most recorders only catch your side: read the article. The engineering behind it: CallVault case study.