# Check Engine Chat vs AutoChemai

The clearest difference is update cadence: AutoChemai at every 2 days against Check Engine Chat's monthly. AutoChemai also leads on iOS requirement (16.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Check Engine Chat sells 1 one-off in-app purchase and AutoChemai sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Check Engine Chat ships an update monthly, AutoChemai every 2 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Check Engine Chat | AutoChemai |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Size | 2.7 GB | 3 MB |
| Requires iOS | 26.2 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Yao Vah Saechao](https://appshunter.io/developer/1845021267) | [KUO WEI Tseng](https://appshunter.io/developer/6802335476) |

## What reviewers say

### Check Engine Chat

[App page](https://appshunter.io/ios/app/check-engine-chat/id6755978445)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Audio Diagnostics Pro | $4.99 | one-time |


### AutoChemai

[App page](https://appshunter.io/ios/app/autochemai-obd2-car-check/id6810481531)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard – Monthly | $9.99 | per month |
| Pro – Monthly | $49.99 | per month |
| Standard – Yearly | $99.99 | per year |
| Pro – Yearly | $499.99 | per year |


## Frequently asked questions

### Is Check Engine Chat free?

Check Engine Chat is free to download, with in-app purchases available.

### Is AutoChemai free?

AutoChemai is free to download, with in-app purchases available.

### Do Check Engine Chat or AutoChemai have ads?

Neither Check Engine Chat nor AutoChemai shows ads.

### Which is updated more often, Check Engine Chat or AutoChemai?

Check Engine Chat ships an update monthly, and AutoChemai every 2 days. Most recently, Check Engine Chat was updated on October 25, 2026 and AutoChemai on October 29, 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.*