Twinbox is a free Android messenger that looks and works like a real calculator. Only your secret code opens the real app — a PIN & fingerprint-locked Safebox for the SMS & MMS you want no one else to see.
Anyone who opens Twinbox sees a fully working calculator — nothing hints there's more. Type your secret code and press =, and your real messenger appears. Lock it again and it's just a calculator once more.
Four simple ideas, working together — the disguise on the outside, the lock on the inside.
A real, usable calculator on the outside. The messenger opens only with your private code — invisible to anyone holding your phone.
Move any conversation into a vault locked by PIN and fingerprint or face. Private threads stay hidden until you unlock them.
Send a sender to the Bin and their future messages auto-sort there — your inbox stays clean and free of spam.
It's your regular SMS/MMS app — messages live on your device, protected behind the decoy and your lock.
Choose a secret code and turn on fingerprint or face unlock. Only you can open the app behind the calculator.
Long-press a message to send it to the Safebox. Future messages from that sender are hidden there automatically.
Everything in the Safebox is locked by your PIN and biometrics. Open, read and reply — privately.
Send unwanted senders to the Bin and their messages auto-sort out of your inbox. Tidy, every day.
Download the free app and turn your messages into a calculator only you can open.
Get it on Google Play