Lock It: Calculator Vault (Android) - looking for testers and feedback

About

Looks like a calculator. Opens like a vault. Lock It: Calculator Vault is a real, working calculator on Android. Type your own secret equation and press =, and it opens a private vault instead. Inside you can keep photos and videos, notes, passwords and 2FA codes, encrypted with AES-256 on your phone. You can also message and make live video or voice calls with people you invite by key or QR code. Your equation is stored only as a salted hash, so we can't see it. I'm the indie developer and I'd love honest feedback from Android users: first-run setup, the vault, and the 2FA screen. Free with ads; Premium Pro and a one-time Offline Vault are optional. Available now on Google Play for Android. iPhone (iOS) version coming soon. Search "Lock It: Calculator Vault" on Google Play https://play.google.com/store/apps/details?id=com.appfactory.calculator&referrer=utm_source%3Dhightechattic%26utm_medium%3Dlisting%26utm_campaign%3Dfree_ads

Links