# 睿学 A vs 七颗牙学堂HD

The clearest difference is device support: 睿学 A at 3 against 七颗牙学堂HD's 1. 睿学 A also leads on iOS requirement (9.0 vs 12.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 睿学 A sells 6 one-off in-app purchases and 七颗牙学堂HD sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

睿学 A ships an update every 4 months, 七颗牙学堂HD every 6 months. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | 睿学 A | 七颗牙学堂HD |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 6 months |
| Size | 298 MB | 54 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 17+ | 17+ |
| Developer | [YaTian Internet Technology Co., Ltd](https://appshunter.io/developer/1229981015) | [春辉 刘](https://appshunter.io/developer/1459975616) |

## What reviewers say

### 睿学 A

[App page](https://appshunter.io/ios/app/a-living/id1556173398)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 60金币 | $0.99 | one-time |
| 60币 | $0.99 | one-time |
| 680金币 | $9.99 | one-time |
| 680币 | $9.99 | one-time |
| 880金币 | $12.99 | one-time |
| 880币 | $12.99 | one-time |


### 七颗牙学堂HD

[App page](https://appshunter.io/ios/app/hd/id6443649334)

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 小七币 | $0.99 | one-time |
| 小七币 | $4.99 | one-time |
| 小七币 | $7.99 | one-time |
| 小七币 | $15.99 | one-time |
| 小七币 | $17.99 | one-time |
| 小七币 | $74.99 | one-time |
| 小七币 | $149.99 | one-time |
| 小七币 | $449.99 | one-time |


## Frequently asked questions

### Is 睿学 A free?

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

### Is 七颗牙学堂HD free?

七颗牙学堂HD is free to download, with in-app purchases available.

### Do 睿学 A or 七颗牙学堂HD have ads?

Neither 睿学 A nor 七颗牙学堂HD shows ads.

### Which is updated more often, 睿学 A or 七颗牙学堂HD?

睿学 A ships an update every 4 months, and 七颗牙学堂HD every 6 months. Most recently, 睿学 A was updated on October 25, 2026 and 七颗牙学堂HD on October 27, 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.*