# 大虾师傅 vs 贵通三元催化

The clearest difference is in-app purchases: 大虾师傅 at none against 贵通三元催化's 5. 大虾师傅 also leads on update cadence (every 2 weeks vs every 9 months). 贵通三元催化's advantage is iOS requirement (9.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. 贵通三元催化 sells 5 one-off in-app purchases. 大虾师傅 asks for nothing beyond the download.

大虾师傅 ships an update every 2 weeks, 贵通三元催化 every 9 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | 大虾师傅 | 贵通三元催化 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 9 months |
| Size | 148 MB | 12 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [China Insurance Automobile Service Technology Co.,Ltd](https://appshunter.io/developer/1440721843) | [浩 兰](https://appshunter.io/developer/1549614818) |

## What reviewers say

### 大虾师傅

[App page](https://appshunter.io/ios/app/id1471075682)

**Features:** Vision Pro support

**In-app purchases:** none


### 贵通三元催化

[App page](https://appshunter.io/ios/app/id1550022825)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1个月会员 | $9.99 | one-time |
| 3个月会员 | $25.49 | one-time |
| 6个月会员 | $51.90 | one-time |
| 年会员 | $95.00 | one-time |
| 2年会员 | $161.99 | one-time |


## Frequently asked questions

### Is 大虾师傅 free?

大虾师傅 is free to download, with no in-app purchases.

### Is 贵通三元催化 free?

贵通三元催化 is free to download, with in-app purchases available.

### Do 大虾师傅 or 贵通三元催化 have ads?

Neither 大虾师傅 nor 贵通三元催化 shows ads.

### Which is updated more often, 大虾师傅 or 贵通三元催化?

大虾师傅 ships an update every 2 weeks, and 贵通三元催化 every 9 months. Most recently, 大虾师傅 was updated on November 3, 2026 and 贵通三元催化 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.*