# 注册安全工程师题库 vs 安全工程师题库2021

The clearest difference is update cadence: 注册安全工程师题库 at every 6 months against 安全工程师题库2021's every 13 months. 注册安全工程师题库 also leads on iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 注册安全工程师题库 sells 3 one-off in-app purchases and 安全工程师题库2021 sells 9 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

注册安全工程师题库 ships an update every 6 months, 安全工程师题库2021 every 13 months. Both last shipped on September 10, 2026.

## The numbers

| Metric | 注册安全工程师题库 | 安全工程师题库2021 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 13 months |
| Size | 8 MB | 48 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [磊 陈](https://appshunter.io/developer/1535417260) | [盼 朱](https://appshunter.io/developer/1708664205) |

## What reviewers say

### 注册安全工程师题库

[App page](https://appshunter.io/ios/app/2025/id1573380792)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月卡 | $8.99 | one-time |
| 年卡 | $9.99 | one-time |
| 三年卡 | $14.99 | one-time |


### 安全工程师题库2021

[App page](https://appshunter.io/ios/app/2021/id1580658966)

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP1个月 | $3.99 | one-time |
| VIP9个月 | $4.99 | one-time |
| VIP12个月 | $7.99 | one-time |
| VIP24个月 | $12.99 | one-time |
| 价值98元的课程 | $14.99 | one-time |
| 价值198元的课程 | $29.99 | one-time |
| 价值298元的课程 | $46.99 | one-time |
| 价值388元的课程 | $59.99 | one-time |
| 价值488元的课程 | $74.99 | one-time |


## Frequently asked questions

### Is 注册安全工程师题库 free?

注册安全工程师题库 is free to download, with in-app purchases available.

### Is 安全工程师题库2021 free?

安全工程师题库2021 is free to download, with in-app purchases available.

### Do 注册安全工程师题库 or 安全工程师题库2021 have ads?

Neither 注册安全工程师题库 nor 安全工程师题库2021 shows ads.

### Which is updated more often, 注册安全工程师题库 or 安全工程师题库2021?

注册安全工程师题库 ships an update every 6 months, and 安全工程师题库2021 every 13 months. Most recently, 注册安全工程师题库 was updated on September 10, 2026 and 安全工程师题库2021 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.*