OneCryption vs Leftover Note
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OneCryption
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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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/
Leftover Note
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You can check expiration dates of the leftovers and receive reminder notifications before expiration.
Screenshots
Verdict
The clearest difference is in-app purchases: Leftover Note at none against OneCryption's 5. On price, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. OneCryption sells 5 in-app purchases, starting at $49.99 per month. Leftover Note asks for nothing beyond the download.
OneCryption ships an update every 3 months, Leftover Note every 4 months. The most recent releases landed on June 5, 2026 and September 21, 2026 respectively.
| Parameter | OneCryption | Leftover Note |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 11 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Christian Hell | WOOSEOK LEE |
In-app purchases
OneCryption
- Premium features monthly7 Days trial$49.991 Month
- Premium features yearly7 Days trial$500.001 Year
- Key of size 100MB$0.99
- Key of size 500MB$0.99
- Premium Lifetime$399.99
Leftover Note
No in-app purchases









