**Built a Wear OS TOTP authenticator where the bezel combination is the vault key — closed testing, looking for daily users**

I've been building RotarySafe for a while and it's finally in a shape where I need real users rather than just me testing on my own watch.

The concept: your 2FA codes live in an encrypted vault that only opens when you dial a four-step rotary combination on your watch bezel. It mirrors a physical combination lock — each step is a number of clicks left or right, zero is not valid, three wrong attempts triggers a hard lock. The app holds no internet permission; everything is local.

Technical details for those who care:

* Communication between phone and watch is AES-256-GCM encrypted at the app layer (on top of Bluetooth link encryption)
* PBKDF2-HMAC-SHA256 at 100k iterations for the combination hash, Argon2id for backup encryption
* The combination hash is computed on the watch before transmission — raw values never leave the device
* Full TOTP per RFC 6238, Google Authenticator import supported

I'm specifically looking for people who will actually use it as their main authenticator, not just install it and forget it. Bugs that only appear in daily use are the interesting ones.

**Steps to join closed testing:**

1. [https://groups.google.com/g/rotarysafe\_closedtesting](https://groups.google.com/g/rotarysafe_closedtesting) (Google Group — required for access)
2. [https://play.google.com/apps/testing/com.luly.rotarysafe](https://play.google.com/apps/testing/com.luly.rotarysafe) (tester registration)
3. [https://play.google.com/store/apps/details?id=com.luly.rotarysafe](https://play.google.com/store/apps/details?id=com.luly.rotarysafe) (install)

  
On the "Become a Tester" page, click the link that says "Download it on Google Play."When you click to "buy" it, Google will show a message: "Test card: Always approves" or "You will not be charged."This meaning 0 cost for you now and after the testing, by the group membership.



Requires a Wear OS watch.

Testers needed for a new Bezel-based 2FA app (RotarySafe)