# 钥匙尺子 vs 简学识字

The clearest difference is in-app purchases: 钥匙尺子 at none against 简学识字's 2. 钥匙尺子 also leads on iOS requirement (10.0 vs 15.0). 简学识字's advantage is update cadence (every 2 days vs fortnightly). On price, ads and device support there is nothing between them.

Both are free to download. 简学识字 sells 2 one-off in-app purchases. 钥匙尺子 asks for nothing beyond the download.

钥匙尺子 ships an update fortnightly, 简学识字 every 2 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 钥匙尺子 | 简学识字 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Size | 31 MB | 2 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Wuxi Kaiyang Electronic Technology Co., Ltd.](https://appshunter.io/developer/1131154502) | [小慧 罗](https://appshunter.io/developer/1806960019) |

## What reviewers say

### 钥匙尺子

[App page](https://appshunter.io/ios/app/id1479796469)

**Features:** macOS Compatibility

**In-app purchases:** none


### 简学识字

[App page](https://appshunter.io/ios/app/id6744444122)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 完整版 解锁 | $0.99 | one-time |
| 完整版解锁 | $1.99 | one-time |


## Frequently asked questions

### Is 钥匙尺子 free?

钥匙尺子 is free to download, with no in-app purchases.

### Is 简学识字 free?

简学识字 is free to download, with in-app purchases available.

### Do 钥匙尺子 or 简学识字 have ads?

Neither 钥匙尺子 nor 简学识字 shows ads.

### Which is updated more often, 钥匙尺子 or 简学识字?

钥匙尺子 ships an update fortnightly, and 简学识字 every 2 days. Most recently, 钥匙尺子 was updated on November 3, 2026 and 简学识字 on October 30, 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.*