A free program for Android, by EZTech Apps.

Calculator Lock: App Lock is an innovative and powerful privacy protection app. With it, you can hide photos and videos from other people, as well as keep your contacts, messages, and notes secure. It is the ultimate tool for protecting your privacy.

This privacy-centric app is the best solution for people who want to hide photos and videos from prying eyes. With Calculator Lock, you can also lock the app itself to prevent others from accessing your private photos, videos, and notes.

You can use the built-in private browser to browse the web safely and securely. It will keep your browsing history and cookies secure and private.