Secure
App works great! Would love to see integration with iMessage so that users could open/read encrypted messages within the messages app and send new encrypted messages within the messages app.
Free
In-App Purchases
About
This app offers true offline encryption for messages, photos, videos, and files. It emphasizes absolute secrecy through direct key exchange and no server reliance, ensuring quantum-proof security.
✓Offline encryption for messages and files
✓Direct key exchange
✓No server reliance
✓Quantum-proof security
✓File and media encryption
✓Simple encryption/decryption
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What's New in OneCryption
2.1.1
October 13, 2026
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.
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Subscriptions & In-App Purchases
Premium features monthly
Unlock all premium features
$49.991 Month
7 Days trialUser reviews
Developer apps
FAQ
What is OneCryption?
OneCryption is the world's first truly offline encryption app. It allows users to communicate with absolute secrecy by exchanging keys directly in person, without relying on any servers or online profiles.
How does OneCryption ensure privacy?
OneCryption ensures privacy by design, meaning keys never pass through the internet and there is no network path to hack. It offers mathematically perfect encryption that is 100 percent unbreakable, even by future quantum computers.
Can I use OneCryption to send photos and videos?
Yes, OneCryption supports full file and media encryption. You can encrypt and decrypt messages, photos, videos, audio messages, and files of any size instantly, even when offline.
Does OneCryption require registration?
No, OneCryption does not require registration, tracking, or data mining. It is designed for true privacy, with no cloud storage or backdoors, ensuring only you and your contact have access.
What are the premium features in OneCryption?
OneCryption offers premium features through monthly and yearly subscriptions. These plans provide enhanced capabilities for users who require advanced functionality, with a 7-day free trial available for both options.
How much does OneCryption cost?
The base version of OneCryption is free to download and use. Premium features are available via subscription, with options for monthly at $49.99 or yearly at $500.00.
Is OneCryption suitable for business use?
Yes, OneCryption is perfect for businesses handling confidential files. Its offline-by-design approach and quantum-proof security make it ideal for safeguarding sensitive corporate data.
What devices does OneCryption support?
OneCryption is currently supported on iPhone devices. It is designed for mobile communication and security on the go.
