OneCryption
Quantum-Proof Security
Only for iPhone
Free · In‑App Purchases · Designed for iPhone
iPhone
ONE – True Privacy Begins Offline
ONE is the world’s first truly offline encryption app.
Meet your contact in person, exchange a key directly, and communicate with absolute secrecy. No servers. No metadata. No way in.
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How it works
1. Meet and exchange identity
Verify your contact face to face — no online profiles, no leaks.
2. Create and share a one-time pad key
Generate a unique key on your device and hand it over directly — never online.
3. Start communicating
Encrypt or decrypt messages, photos, videos, audiomessages, or files instantly — even offline.
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Why ONE is different
Offline by design: Keys never pass through the internet.
No interception possible: There is no network path to hack.
Quantum-proof: Even future computers cannot break a key they never saw.
Simple to use: Tap once to encrypt, tap again to decrypt.
Full control: Create, manage, and share keys securely between devices.
File and media encryption: Protect your images, videos, and documents of any size.
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Perfect for
Journalists and whistleblowers
Businesses handling confidential files
Couples, friends, and teams who value absolute privacy
Anyone tired of “secure” messengers that rely on servers
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Why meet in person?
Because true privacy starts offline.
No cloud. No backdoors. Just you, your contact, and your key.
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Experience absolute privacy
ONE is more than an app – it is a statement.
No registration. No tracking. No data mining.
Just mathematically perfect encryption – 100 percent unbreakable.
Download ONE now and take back control of your privacy.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Added audiorecording and some bugfixes
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 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.
- Languages
- English
- Age Rating
4+
- 4+
- Contains
User-Generated Content
- In-App Purchases
Yes
- Premium features yearly $500.00
- Premium features monthly $49.99
- Copyright
- © 2025 Christian Hell