# 消防工程师 vs 九源在线

The clearest difference is in-app purchases: 九源在线 at none against 消防工程师's 3. 九源在线 also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (12.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. 消防工程师 sells 3 one-off in-app purchases. 九源在线 asks for nothing beyond the download.

消防工程师 ships an update every 2 months, 九源在线 every 3 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 消防工程师 | 九源在线 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 30 MB | 44 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Sichuan Palm Cloud Technology Co., Ltd.](https://appshunter.io/developer/983183897) | [Henan Jiuyuan Education Technology Co., Ltd.](https://appshunter.io/developer/1458078031) |

## What reviewers say

### 消防工程师

[App page](https://appshunter.io/ios/app/2026/id1260266429)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 一级注册消防工程师VIP半年包 | $2.99 | one-time |
| 一级注册消防工程师VIP一年包 | $3.99 | one-time |
| 一级注册消防工程师VIP三年包 | $5.99 | one-time |


### 九源在线

[App page](https://appshunter.io/ios/app/id1470735487)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 消防工程师 free?

消防工程师 is free to download, with in-app purchases available.

### Is 九源在线 free?

九源在线 is free to download, with no in-app purchases.

### Do 消防工程师 or 九源在线 have ads?

Neither 消防工程师 nor 九源在线 shows ads.

### Which is updated more often, 消防工程师 or 九源在线?

消防工程师 ships an update every 2 months, and 九源在线 every 3 weeks. Most recently, 消防工程师 was updated on November 2, 2026 and 九源在线 on November 3, 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.*