# Add and subtract within 20 vs 閱讀悅FUN2

The clearest difference is price: 閱讀悅FUN2 at Free against Add and subtract within 20's $2.99. 閱讀悅FUN2 also leads on update cadence (every 5 days vs every 36 months) and iOS requirement (7.0 vs 12.0). Add and subtract within 20's advantage is device support (3 vs 1). On ads and in-app purchases there is nothing between them.

閱讀悅FUN2 is free to download; Add and subtract within 20 costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Add and subtract within 20 ships an update every 36 months, 閱讀悅FUN2 every 5 days. The most recent releases landed on October 23, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Add and subtract within 20 | 閱讀悅FUN2 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 5 days** |
| Monetization | Paid | — |
| Size | 18 MB | 161 MB |
| Requires iOS | 12.0 | **7.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sergey Malugin](https://appshunter.io/developer/562782409) | [Hong Chi Association](https://appshunter.io/developer/645391618) |

## What reviewers say

### Add and subtract within 20

[App page](https://appshunter.io/ios/app/add-and-subtract-within-20/id757149544)

This app transforms math practice into an exciting adventure for children. It uses interactive mini-games and handwriting recognition to make learning addition and subtraction within 20 fun and effective. The difficulty adapts to your child's progress for a personalized experience.

**Highlights:** Interactive mini-games, Handwriting recognition, Adaptive difficulty, Targeted addition/subtraction practice, Natural learning input

**Features:** macOS Compatibility

**In-app purchases:** none


### 閱讀悅FUN2

[App page](https://appshunter.io/ios/app/fun2/id1369694931)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Add and subtract within 20 free?

Add and subtract within 20 costs $2.99, with no in-app purchases.

### Is 閱讀悅FUN2 free?

閱讀悅FUN2 is free to download, with no in-app purchases.

### Do Add and subtract within 20 or 閱讀悅FUN2 have ads?

Neither Add and subtract within 20 nor 閱讀悅FUN2 shows ads.

### Which is updated more often, Add and subtract within 20 or 閱讀悅FUN2?

Add and subtract within 20 ships an update every 36 months, and 閱讀悅FUN2 every 5 days. Most recently, Add and subtract within 20 was updated on October 23, 2026 and 閱讀悅FUN2 on October 8, 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.*