# IMSC91 vs 修车助手HD

The clearest difference is ads: IMSC91 at none against 修车助手HD's shown. IMSC91 also leads on iOS requirement (12.0 vs 15.5). 修车助手HD's advantage is update cadence (every 3 weeks vs every 2 months). On price, 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.

IMSC91 ships an update every 2 months, 修车助手HD every 3 weeks. The most recent releases landed on October 13, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | IMSC91 | 修车助手HD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hd/id6602885548/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Ad-supported |
| Size | 148 MB | 108 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [北京金奔腾汽车科技有限公司](https://appshunter.io/developer/939116243) | [Tongling Diyi Information Technology Development Co., Ltd](https://appshunter.io/developer/1721086091) |

## What reviewers say

### IMSC91

[App page](https://appshunter.io/ios/app/imsc91/id1250310840)

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

**In-app purchases:** none


### 修车助手HD

[App page](https://appshunter.io/ios/app/hd/id6602885548)

This utility app provides helpful resources for car maintenance and repair. It is updated weekly and offers a community forum for members to ask questions and get assistance from customer service if specific information cannot be found.

**Highlights:** Weekly updates, Member community forum, Customer support for missing data, Car maintenance resources

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

**In-app purchases:** none


## Frequently asked questions

### Is IMSC91 free?

IMSC91 is free to download, with no in-app purchases.

### Is 修车助手HD free?

修车助手HD is free to download, with no in-app purchases.

### Do IMSC91 or 修车助手HD have ads?

修车助手HD shows ads; IMSC91 does not.

### Which is updated more often, IMSC91 or 修车助手HD?

IMSC91 ships an update every 2 months, and 修车助手HD every 3 weeks. Most recently, IMSC91 was updated on October 13, 2026 and 修车助手HD on October 4, 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.*