# 呱呱数学 vs KnowClock

The clearest difference is update cadence: KnowClock at fortnightly against 呱呱数学's every 5 weeks. 呱呱数学's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 呱呱数学 sells 9 one-off in-app purchases and KnowClock sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

呱呱数学 ships an update every 5 weeks, KnowClock fortnightly. Both last shipped on October 31, 2026.

## The numbers

| Metric | 呱呱数学 | KnowClock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Size | 263 MB | 11 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Qingdao Zunbo Information Technology Co., Ltd.](https://appshunter.io/developer/1823132942) | [中周 王](https://appshunter.io/developer/1611287450) |

## What reviewers say

### 呱呱数学

[App page](https://appshunter.io/ios/app/id6762510327)

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 拼音永久卡 | $19.99 | one-time |
| 识字永久卡 | $24.99 | one-time |
| 英语永久卡 | $29.99 | one-time |
| 识字+拼音永久卡 | $29.99 | one-time |
| 识字+拼音+英语永久卡 | $39.99 | one-time |
| 数学永久卡 | $39.99 | one-time |
| 识字+拼音+数学永久卡 | $49.99 | one-time |
| 识字+拼音+英语+数学永久卡 | $59.99 | one-time |
| 识字+拼音+英语+古诗+数学永久卡 | $59.99 | one-time |


### KnowClock

[App page](https://appshunter.io/ios/app/knowclock-kids-clock/id6765656447)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月订阅 | $0.99 | per month |
| 年订阅 | $2.99 | per year |
| 终身解锁 | $4.99 | one-time |


## Frequently asked questions

### Is 呱呱数学 free?

呱呱数学 is free to download, with in-app purchases available.

### Is KnowClock free?

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

### Do 呱呱数学 or KnowClock have ads?

Neither 呱呱数学 nor KnowClock shows ads.

### Which is updated more often, 呱呱数学 or KnowClock?

呱呱数学 ships an update every 5 weeks, and KnowClock fortnightly. Most recently, 呱呱数学 was updated on October 31, 2026 and KnowClock on October 31, 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.*