# 正規表現(Regular Expression) vs CSS Quiz

The clearest difference is in-app purchases: 正規表現(Regular Expression) at none against CSS Quiz's 3. CSS Quiz's advantage is update cadence (fortnightly vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CSS Quiz sells 3 in-app purchases, starting at $0.99 per 7 days. 正規表現(Regular Expression) asks for nothing beyond the download.

正規表現(Regular Expression) ships an update every 8 months, CSS Quiz fortnightly. The most recent releases landed on September 26, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 正規表現(Regular Expression) | CSS Quiz |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 8 months | **Fortnightly** |
| Size | 14 MB | 78 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hiroki Sato](https://appshunter.io/developer/1514602166) | [Creatopia Inc.](https://appshunter.io/developer/1523447963) |

## What reviewers say

### 正規表現(Regular Expression)

[App page](https://appshunter.io/ios/app/regular-expression/id1529795657)

**Features:** macOS Compatibility

**In-app purchases:** none


### CSS Quiz

[App page](https://appshunter.io/ios/app/css-quiz-learn-with-ai/id6739124578)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $0.99 | per 7 days |
| Monthly Premium | $2.99 | per month |
| Yearly Premium | $24.99 | per year |


## Frequently asked questions

### Is 正規表現(Regular Expression) free?

正規表現(Regular Expression) is free to download, with no in-app purchases.

### Is CSS Quiz free?

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

### Do 正規表現(Regular Expression) or CSS Quiz have ads?

Both 正規表現(Regular Expression) and CSS Quiz show ads.

### Which is updated more often, 正規表現(Regular Expression) or CSS Quiz?

正規表現(Regular Expression) ships an update every 8 months, and CSS Quiz fortnightly. Most recently, 正規表現(Regular Expression) was updated on September 26, 2026 and CSS Quiz on October 11, 2026.

---

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