End-to-end encrypted messaging with optional one-time-pad security.
About OTPphone
OTPphone is a communication app developed by Vernam.
Download Statistics
OTPphone has been downloaded 33 times. In the last 30 days, the app was downloaded 12 times.
User Ratings
The app has no ratings yet.
App Information
OTPphone is FREE to download. The APK download size is 15.09 MB. The latest version available is 1.2.3. The last update was on July 22, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play 1 week ago.
Description
OTPPhone is a private messenger built for people who take confidentiality seriously. Every message is end-to-end encrypted, so its contents are never readable by us, by anyone running the infrastructure, or by anyone watching the network. There are no accounts, no phone numbers, no email, and no tracking.
WHY OTPPHONE
• End-to-end encryption by default. Messages are sealed with modern public-key cryptography (HPKE: X25519 + AES-256-GCM) before they ever leave your phone.
• Optional one-time-pad layer. For your most sensitive conversations, add a second layer of one-time-pad encryption, the only cipher with information- theoretic security. Generate true random pads on-device using your camera as an entropy source, and exchange them in person.
• In-person key exchange over Bluetooth. Meet face to face and pair directly, so no server ever sees your keys. Verify with a short safety phrase to be sure there's no one in the middle.
• Add contacts with a QR code. Share your identity by showing a QR code and scanning theirs, no usernames to look up, nothing to type.
• Your data stays on your device. Message history, contacts, and keys are stored locally and encrypted at rest with AES-256 (SQLCipher). Keys live in the Android Keystore.
• Biometric app lock. Require your fingerprint or face to open the app.
• No accounts. Your identity is a cryptographic key that you control. Nothing to sign up for, nothing to recover, nothing for us to leak.
WHAT THE SERVER CAN AND CANNOT SEE
Our relay only forwards sealed messages between devices. It cannot read your messages, it only ever handles ciphertext. It does not store your message content, and it does not keep advertising or analytics profiles on you.
WHO IT'S FOR
Journalists, activists, lawyers, businesses, and anyone who wants their private conversations to stay private. OTPPhone gives you strong defaults and, when you need it, the strongest encryption that exists.
Get a detailed PDF report for OTPphone with download trends, rating history,
and key performance statistics — useful for competitive research or tracking your own app.
Learn more
Are you the developer of this app? Join us for free to see more information about your app and learn how we can help you promote and earn money with your app.
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
