# ROT13 Decoder vs GrepEx

The clearest difference is price: ROT13 Decoder at Free against GrepEx's $1.99. GrepEx's advantage is update cadence (weekly vs every 8 months) and iOS requirement (13.4 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

ROT13 Decoder is free to download; GrepEx costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ROT13 Decoder ships an update every 8 months, GrepEx weekly. The most recent releases landed on September 27, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ROT13 Decoder | GrepEx |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Size | 16 MB | 12 MB |
| Requires iOS | 15.0 | **13.4** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [佳伟 蔡](https://appshunter.io/developer/1801859662) | [Jeremy Laratro](https://appshunter.io/developer/1864044207) |

## What reviewers say

### ROT13 Decoder

[App page](https://appshunter.io/ios/app/rot13-decoder/id6743629613)

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

**In-app purchases:** none


### GrepEx

[App page](https://appshunter.io/ios/app/grepex/id6756987451)

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

**In-app purchases:** none


## Frequently asked questions

### Is ROT13 Decoder free?

ROT13 Decoder is free to download, with no in-app purchases.

### Is GrepEx free?

GrepEx costs $1.99, with no in-app purchases.

### Do ROT13 Decoder or GrepEx have ads?

Neither ROT13 Decoder nor GrepEx shows ads.

### Which is updated more often, ROT13 Decoder or GrepEx?

ROT13 Decoder ships an update every 8 months, and GrepEx weekly. Most recently, ROT13 Decoder was updated on September 27, 2026 and GrepEx on October 7, 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.*