# Regex Replacer vs OpenAPI Viewer

The clearest difference is in-app purchases: Regex Replacer at none against OpenAPI Viewer's 3. Regex Replacer also leads on iOS requirement (9.0 vs 18.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. OpenAPI Viewer sells 3 one-off in-app purchases. Regex Replacer asks for nothing beyond the download.

Regex Replacer ships an update every 2 weeks, OpenAPI Viewer every 3 weeks. The most recent releases landed on October 5, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Regex Replacer | OpenAPI Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | Free | — |
| Size | 65 MB | 15 MB |
| Requires iOS | **9.0** | 18.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Yukiya Ueda](https://appshunter.io/developer/1526923248) | [Victor Manuel Puga Ruiz](https://appshunter.io/developer/1648773908) |

## What reviewers say

### Regex Replacer

[App page](https://appshunter.io/ios/app/regex-replacer/id1561527848)

This tool allows you to replace character strings using predefined or custom regular expressions. It's designed for developers and technical users who need to manipulate text data efficiently.

**Highlights:** Replace character strings, Use prepared regular expressions, Create custom regular expressions, Efficient text manipulation

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

**In-app purchases:** none


### OpenAPI Viewer

[App page](https://appshunter.io/ios/app/openapi-viewer/id6761346493)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Large Tip | $9.99 | one-time |


## Frequently asked questions

### Is Regex Replacer free?

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

### Is OpenAPI Viewer free?

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

### Do Regex Replacer or OpenAPI Viewer have ads?

Neither Regex Replacer nor OpenAPI Viewer shows ads.

### Which is updated more often, Regex Replacer or OpenAPI Viewer?

Regex Replacer ships an update every 2 weeks, and OpenAPI Viewer every 3 weeks. Most recently, Regex Replacer was updated on October 5, 2026 and OpenAPI Viewer on October 22, 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.*