# OneCryption — Quantum-Proof Security > Offline encryption app for absolute secrecy and quantum-proof communication. (iPhone/iPad app by Christian Hell.) - Source: https://appshunter.io/ios/app/onecryption/id1399893476 (this page in markdown: same URL + `.md`) - Developer: [Christian Hell](https://appshunter.io/developer/329510560) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 17.6 · 11 MB - Languages: American English, French (France), German (Germany), Italian, European Portuguese, Russian, European Spanish, Swedish - Released: 2018-11-30 - Data updated: 2026-06-05 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/onecryption/id1399893476/reviews.md ## What is OneCryption? 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. --- 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. --- 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. --- 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 --- Why meet in person? Because true privacy starts offline. No cloud. No backdoors. Just you, your contact, and your key. --- 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/ ## Key features - Offline encryption for messages and files - Direct key exchange - No server reliance - Quantum-proof security - File and media encryption - Simple encryption/decryption ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium features monthly | $49.99 | per month | | Premium features yearly | $500.00 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Key of size 100MB | $0.99 | one-time | | Premium Lifetime | $399.99 | one-time | | Key of size 500MB | $0.99 | one-time | ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/onecryption/id1399893476/reviews.md ### 5/5 — Secure *2019-02-14* 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. ## Frequently asked questions about OneCryption ### 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. ## Version history (last 5 releases) ### 2.1.0 — 2026-03-25 Introduced a new unified message type that replaces single-purpose message formats. One message can now include text and, when needed, images, videos, files, and audio recordings. ### 2.0.1 — 2025-11-11 Added audiorecording and some bugfixes ### 2.0.0 — 2025-10-23 ONE is back – completely redesigned and rebuilt from the ground up. Enjoy a new interface, faster encryption, and full offline operation using real one-time pad keys. Encrypt text, images, videos, and large files with quantum-proof security – without any internet connection. This version marks a fresh start with a modern foundation for future updates. ### 1.0.1 — 2019-02-09 Bugfixes and improvements ### 1.0 — 2018-11-29 No release notes. ## Apps similar to OneCryption | App | Rating | Price | Category | | --- | --- | --- | --- | | [Safe Connector - Fast VPN](https://appshunter.io/ios/app/safe-connector-fast-vpn/id1582133772) | — | Free | Utilities | | [AdBlock Ninja for Safari](https://appshunter.io/ios/app/adblock-ninja-for-safari/id6736834136) | 5.0 (2) | Free | Utilities | | [Privoro](https://appshunter.io/ios/app/privoro/id1051130299) | 4.8 (13) | Free | Utilities | | [ForceChk](https://appshunter.io/ios/app/forcechk/id1536148707) | — | Free | Utilities | | [DecideNow - Rational Decisions](https://appshunter.io/ios/app/decidenow-rational-decisions/id6596765054) | — | Free | Utilities | | [ToolNest](https://appshunter.io/ios/app/toolnest/id6742773202) | 5.0 (1) | Free | Utilities | ## More apps by Christian Hell - [Audiobooks AM](https://appshunter.io/ios/app/audiobooks-am/id1484271947) - [iBLOXX](https://appshunter.io/ios/app/ibloxx/id1591743302) - [Date-Buddy](https://appshunter.io/ios/app/date-buddy/id6443831885) - [RepairFair](https://appshunter.io/ios/app/repairfair/id6608972386) All apps by Christian Hell: https://appshunter.io/developer/329510560 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*