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Lock It: Calculator Vault is a calculator that does real math. 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. Chat and make video or voice calls only with people you invite by key or QR code, and send files up to 1 GB through Encrypted Cloud. Free with ads. 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%3Dasiolaunch%26utm_medium%3Dlisting%26utm_campaign%3Dfree_ads