# S vs 知室

The clearest difference is ads: 知室 at none against S's shown. 知室 also leads on update cadence (every 3 weeks vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. S sells 6 one-off in-app purchases and 知室 sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

S ships an update every 4 months, 知室 every 3 weeks. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | S | 知室 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/id1357030907/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 871 MB | 247 MB |
| Requires iOS | 12.2 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Zhiniao Education Technology Co., Ltd](https://appshunter.io/developer/1574648569) | [Shanghai Zhidaozhishi Digitaltechnology Co., Ltd.](https://appshunter.io/developer/1434287057) |

## What reviewers say

### S

[App page](https://appshunter.io/ios/app/s/id1014410497)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 4米粒 | $0.99 | one-time |
| 8米粒 | $1.99 | one-time |
| 21米粒 | $4.99 | one-time |
| 35米粒 | $7.99 | one-time |
| 89米粒 | $19.99 | one-time |
| 432米粒 | $94.99 | one-time |


### 知室

[App page](https://appshunter.io/ios/app/id1357030907)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 18知果礼包 | $2.99 | one-time |
| 50知果礼包 | $7.99 | one-time |
| 98知果礼包 | $14.99 | one-time |
| 198知果礼包 | $29.99 | one-time |
| 588知果礼包 | $89.99 | one-time |
| 998知果礼包 | $149.99 | one-time |


## Frequently asked questions

### Is S free?

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

### Is 知室 free?

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

### Do S or 知室 have ads?

S shows ads; 知室 does not.

### Which is updated more often, S or 知室?

S ships an update every 4 months, and 知室 every 3 weeks. Most recently, S was updated on November 1, 2026 and 知室 on November 2, 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.*