# CHENGNAIER vs OBDII Scanner

The clearest difference is update cadence: CHENGNAIER at weekly against OBDII Scanner's every 4 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CHENGNAIER ships an update weekly, OBDII Scanner every 4 weeks. The most recent releases landed on October 8, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CHENGNAIER | OBDII Scanner |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 weeks |
| Size | 141 MB | 113 MB |
| Requires iOS | **12.0** | 13 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [东莞市新昱网络科技有限公司](https://appshunter.io/developer/1582117895) | [JDiag Electronics Technology Co., Ltd](https://appshunter.io/developer/1298431912) |

## What reviewers say

### CHENGNAIER

[App page](https://appshunter.io/ios/app/chengnaier/id6749559056)

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

**In-app purchases:** none


### OBDII Scanner

[App page](https://appshunter.io/ios/app/obdii-scanner/id6754549867)

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

**In-app purchases:** none


## Frequently asked questions

### Is CHENGNAIER free?

CHENGNAIER is free to download, with no in-app purchases.

### Is OBDII Scanner free?

OBDII Scanner is free to download, with no in-app purchases.

### Do CHENGNAIER or OBDII Scanner have ads?

Neither CHENGNAIER nor OBDII Scanner shows ads.

### Which is updated more often, CHENGNAIER or OBDII Scanner?

CHENGNAIER ships an update weekly, and OBDII Scanner every 4 weeks. Most recently, CHENGNAIER was updated on October 8, 2026 and OBDII Scanner on October 28, 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.*