# OneCryption vs Crypto String

The clearest difference is price: OneCryption at Free against Crypto String's $0.99. Crypto String's advantage is in-app purchases (none vs 5). On update cadence, ads, device support and iOS requirement there is nothing between them.

OneCryption is free to download; Crypto String costs $0.99 up front. OneCryption sells 5 in-app purchases, starting at $49.99 per month. Crypto String asks for nothing beyond the download.

OneCryption ships an update every 3 months, Crypto String every 4 months. The most recent releases landed on September 29, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | OneCryption | Crypto String |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/onecryption/id1399893476/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Freemium | — |
| Size | 11 MB | 0 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Christian Hell](https://appshunter.io/developer/329510560) | [Xu Wang](https://appshunter.io/developer/1216698112) |

## What reviewers say

### OneCryption

[App page](https://appshunter.io/ios/app/onecryption/id1399893476)

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.

**Highlights:** Offline encryption for messages and files, Direct key exchange, No server reliance, Quantum-proof security, File and media encryption, Simple encryption/decryption

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium features monthly | $49.99 | per month |
| Premium features yearly | $500.00 | per year |
| Key of size 100MB | $0.99 | one-time |
| Key of size 500MB | $0.99 | one-time |
| Premium Lifetime | $399.99 | one-time |


### Crypto String

[App page](https://appshunter.io/ios/app/crypto-string-aes-encrypt/id6754283595)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OneCryption free?

OneCryption is free to download, with in-app purchases available.

### Is Crypto String free?

Crypto String costs $0.99, with no in-app purchases.

### Do OneCryption or Crypto String have ads?

Neither OneCryption nor Crypto String shows ads.

### Which is updated more often, OneCryption or Crypto String?

OneCryption ships an update every 3 months, and Crypto String every 4 months. Most recently, OneCryption was updated on September 29, 2026 and Crypto String on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*