# StealthOp vs Java Prep

The clearest difference is in-app purchases: StealthOp at none against Java Prep's 3. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Java Prep sells 3 in-app purchases, starting at $0.99 per month. StealthOp asks for nothing beyond the download.

## The numbers

| Metric | StealthOp | Java Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stealthop-secure-pgp-messages/id6740215870/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 6 weeks |
| Monetization | Free | — |
| Size | 1 MB | 17 MB |
| Requires iOS | 17.0 | **16** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [Grey LLC](https://appshunter.io/developer/1597606243) | [嘉 邱](https://appshunter.io/developer/1708883953) |

## What reviewers say

### StealthOp

[App page](https://appshunter.io/ios/app/stealthop-secure-pgp-messages/id6740215870)

This app allows you to hide encrypted text messages and images within seemingly normal text. It uses advanced zero-width character technology and military-grade encryption to ensure your communications are invisible and secure.

**Highlights:** Hide encrypted text messages, Embed encrypted images in text, Zero-width character steganography, RSA 2048-bit encryption, Dual contact system with QR key exchange, Automatic detection of hidden content, End-to-end encryption

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

**In-app purchases:** none


### Java Prep

[App page](https://appshunter.io/ios/app/java-prep/id6748876631)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $0.99 | per month |
| Quarterly Membership | $2.99 | per 3 months |
| Semi-Annual Membership | $5.99 | per 6 months |


## Frequently asked questions

### Is StealthOp free?

StealthOp is free to download, with no in-app purchases.

### Is Java Prep free?

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

### Do StealthOp or Java Prep have ads?

Neither StealthOp nor Java Prep shows ads.

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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.*