# dev HTML Playground vs HeaderX

The clearest difference is device support: HeaderX at 4 against dev HTML Playground's 2. HeaderX also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

dev HTML Playground ships an update weekly, HeaderX every 8 days. The most recent releases landed on September 10, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | dev HTML Playground | HeaderX |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 8 days |
| Size | 3 MB | 1 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [KOICHIRO YAMAMOTO](https://appshunter.io/developer/1191754397) | [Gyuman Kim](https://appshunter.io/developer/1120436841) |

## What reviewers say

### dev HTML Playground

[App page](https://appshunter.io/ios/app/dev-html-playground-web-ide/id6788730344)

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

**In-app purchases:** none


### HeaderX

[App page](https://appshunter.io/ios/app/headerx/id6790552565)

**Features:** Safari Extension, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is dev HTML Playground free?

dev HTML Playground is free to download, with no in-app purchases.

### Is HeaderX free?

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

### Do dev HTML Playground or HeaderX have ads?

Neither dev HTML Playground nor HeaderX shows ads.

### Which is updated more often, dev HTML Playground or HeaderX?

dev HTML Playground ships an update weekly, and HeaderX every 8 days. Most recently, dev HTML Playground was updated on September 10, 2026 and HeaderX on September 16, 2026.

---

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