# 数独城 vs SC Class Assistant

The clearest difference is update cadence: SC Class Assistant at every 2 days against 数独城's every 9 days. 数独城's advantage is iOS requirement (15.0 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 数独城 sells 5 one-off in-app purchases and SC Class Assistant sells 2 in-app purchases, starting at $2.99 per year. Whichever you choose, the download price is not the number that matters.

数独城 ships an update every 9 days, SC Class Assistant every 2 days. The most recent releases landed on August 25, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | 数独城 | SC Class Assistant |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/sc-class-assistant/id6745229100/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 2 days** |
| Monetization | — | Freemium |
| Size | 28 MB | 65 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [正旋 金](https://appshunter.io/developer/1452746772) | [Robert Wilkens](https://appshunter.io/developer/1278771320) |

## What reviewers say

### 数独城

[App page](https://appshunter.io/ios/app/id1670078749)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 数独币100枚 | $0.99 | one-time |
| Unlock all levels | $0.99 | one-time |
| 解锁模式avatar | $0.99 | one-time |
| 解锁模式color | $0.99 | one-time |
| 100 correction opportunities | $1.99 | one-time |


### SC Class Assistant

[App page](https://appshunter.io/ios/app/sc-class-assistant/id6745229100)

This classroom management tool allows educators to easily manage attendance, homework, and student behavior using a visual seating chart. It offers features like roster import, random student selection, and dynamic group generation. Student data is kept private on the device.

**Highlights:** Customizable seating chart, Attendance and homework tracking, Random student picker, Dynamic group generator, Behavior management logging, Roster import from CSV

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Pro Access | $2.99 | per year |
| Lifetime Pro Access | $7.99 | one-time |


## Frequently asked questions

### Is 数独城 free?

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

### Is SC Class Assistant free?

SC Class Assistant is free to download, with in-app purchases available.

### Do 数独城 or SC Class Assistant have ads?

Neither 数独城 nor SC Class Assistant shows ads.

### Which is updated more often, 数独城 or SC Class Assistant?

数独城 ships an update every 9 days, and SC Class Assistant every 2 days. Most recently, 数独城 was updated on August 25, 2026 and SC Class Assistant on September 10, 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.*