OneCryption
Private files. Offline keys.
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Encrypt files and messages on your iPhone with secret keys exchanged in person. Choose how to share the encrypted result.
Private files and messages, encrypted on your iPhone.
OneCryption is an offline encryption tool for people who prefer to exchange secret keys in person. It does not operate a message-delivery network: you choose how to send the encrypted result.
HOW IT WORKS
1. Meet your contact and confirm their identity.
2. Generate shared secret key material and transfer it directly between nearby devices.
3. Write a message or select content, encrypt it locally, and share the encrypted result through a channel you choose.
4. The recipient decrypts it with the matching shared key.
YOUR KEYS, YOUR CONTROL
- Encrypt and decrypt text, photos, videos, audio and files.
- Manage contacts and shared keys on your device.
- See how much key material remains and exchange a fresh key when needed.
- Use local encryption without a OneCryption messaging account.
OneCryption uses a one-time-pad workflow. Key material must remain secret and must never be reused. Protect the devices and the key exchange. The channel you use to deliver encrypted content has its own privacy and metadata implications; encryption does not make a compromised device safe.
FREE AND PREMIUM
Text encryption is available for free. Some media and file features require Premium. Purchase options and current prices are shown in the app. If you choose a subscription, it renews automatically unless you cancel it in your App Store account settings.
Privacy policy: https://www.onecryption.com/privacy
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Security update for file and audio encryption. Key material is now reserved before encryption, and key counters cannot be reset by stale saves.
Previously encrypted messages remain readable. Newly encrypted files and audio require OneCryption 2.1.1 or later on both devices.
Messages using a future unsupported format now show an update notice with a link to the App Store.
Adaptive layouts for iPhone Duo and improved translations across all eight supported languages.
The developer, Christian Hell, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Christian Hell
- Size
- 11.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 7 more
- English, French, German, Italian, Portuguese, Russian, Spanish, Swedish
- Age Rating
4+
- 4+
- Contains
User-Generated Content
- In-App Purchases
Yes
- Premium features yearly $500.00
- Premium features monthly $49.99
- Copyright
- © 2026 Christian Hell