# 数学智慧岛 vs 20以内加减法口算

The clearest difference is rating: 20以内加减法口算 at 4.3 against 数学智慧岛's 3.6. 20以内加减法口算 also leads on in-app purchases (none vs 3) and ads (none vs shown). 数学智慧岛's advantage is update cadence (monthly vs every 23 months). On price, review sentiment and device support there is nothing between them.

Both are free to download. 数学智慧岛 sells 3 in-app purchases, starting at $0.99 per 7 days. 20以内加减法口算 asks for nothing beyond the download.

20以内加减法口算 holds the better App Store score, 4.3 against 3.6. That said, the two scores are not equally well evidenced: 20以内加减法口算 has 56 ratings behind it against 5, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

数学智慧岛 ships an update monthly, 20以内加减法口算 every 23 months. The most recent releases landed on October 12, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | 数学智慧岛 | 20以内加减法口算 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (5 ratings)](https://appshunter.io/ios/app/id673925954/reviews) | **[4.3 (56 ratings)](https://appshunter.io/ios/app/20/id1087409662/reviews)** |
| Number of ratings | 5 | **56** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 23 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 53 MB | 42 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [勇 张](https://appshunter.io/developer/660224883) | [华 周](https://appshunter.io/developer/569428357) |

## What reviewers say

### 数学智慧岛

[App page](https://appshunter.io/ios/app/id673925954)

This app helps young children learn numbers and basic math concepts through engaging games and activities. It covers number recognition, counting, addition, subtraction, and multiplication, making learning fun and interactive for preschoolers and early elementary students.

**Highlights:** Number recognition 0-100, Counting and quantity recognition, Basic addition and subtraction, Multiplication and division practice, Interactive math games, Learn through play, Parent-child interaction

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 一星期VIP会员 | $0.99 | per 7 days |
| 数学启蒙月度VIP会员 | $1.49 | per month |
| 数学启蒙年度VIP会员 | $1.49 | per year |


### 20以内加减法口算

[App page](https://appshunter.io/ios/app/20/id1087409662)

This app helps children aged 3-7 develop essential mental math skills with addition and subtraction problems up to 20. It uses engaging game-based learning with varying difficulty levels and includes practice and timed test modes.

**Highlights:** Addition and subtraction up to 20, Mixed operation practice, Game-based learning, Multiple difficulty levels, Practice mode with hints, Timed test mode, Voice prompts

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 数学智慧岛 free?

数学智慧岛 is free to download, with in-app purchases available.

### Is 20以内加减法口算 free?

20以内加减法口算 is free to download, with no in-app purchases.

### Which has better reviews, 数学智慧岛 or 20以内加减法口算?

20以内加减法口算 is rated higher. 数学智慧岛 averages 3.6 out of 5 from 5 ratings, while 20以内加减法口算 averages 4.3 from 56 ratings.

### Do 数学智慧岛 or 20以内加减法口算 have ads?

数学智慧岛 shows ads; 20以内加减法口算 does not.

### Which is updated more often, 数学智慧岛 or 20以内加减法口算?

数学智慧岛 ships an update monthly, and 20以内加减法口算 every 23 months. Most recently, 数学智慧岛 was updated on October 12, 2026 and 20以内加减法口算 on October 26, 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.*