# ChkOBD OBD2 Analyzer vs M100

The clearest difference is in-app purchases: M100 at none against ChkOBD OBD2 Analyzer's 4. M100 also leads on rating (3.3 vs 3.0) and update cadence (every 3 weeks vs every 3 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. ChkOBD OBD2 Analyzer sells 4 in-app purchases, starting at $4.99 per month. M100 asks for nothing beyond the download.

M100 holds the better App Store score, 3.3 against 3.0. Both are backed by a comparable volume of ratings — 4 and 6 respectively.

ChkOBD OBD2 Analyzer ships an update every 3 months, M100 every 3 weeks. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ChkOBD OBD2 Analyzer | M100 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/chkobd-obd2-analyzer/id1511585011/reviews) | **[3.3 (6 ratings)](https://appshunter.io/ios/app/m100/id1619029812/reviews)** |
| Number of ratings | 4 | **6** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 63 MB | 97 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Check On-Board Diagnostics LLC](https://appshunter.io/developer/1511585010) | [Shenzhen Chaoyue Technology Development Co.,Ltd](https://appshunter.io/developer/1223781320) |

## What reviewers say

### ChkOBD OBD2 Analyzer

[App page](https://appshunter.io/ios/app/chkobd-obd2-analyzer/id1511585011)

Connect your iPhone or iPad to your car's engine to view vital data. Access basic engine values for free, with in-app purchases for advanced diagnostics, smog check readiness, VIN analysis, and error decoding.

**Highlights:** View engine values, In-app purchase for advanced data, Smog Check Assistant, VIN Analyzer, Error Decoder and Reset, Bluetooth adapter compatibility check

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smog Check Assistant | $4.99 | per month |
| VIN Analyzer | $1.99 | one-time |
| Error Analyzer | $2.99 | one-time |
| Advance Engine Values | $4.99 | one-time |


### M100

[App page](https://appshunter.io/ios/app/m100/id1619029812)

This application connects to your vehicle via Bluetooth to provide diagnostic and monitoring functions. It allows you to read and clear fault codes, analyze driving performance, and view instrument panel data. Supports multiple languages and operates on low power.

**Highlights:** Fault code reading and clearing, Instrument panel display, Performance testing, Driving analysis, Bluetooth 4.0 adapter support, Multi-language support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ChkOBD OBD2 Analyzer free?

ChkOBD OBD2 Analyzer is free to download, with in-app purchases available.

### Is M100 free?

M100 is free to download, with no in-app purchases.

### Which has better reviews, ChkOBD OBD2 Analyzer or M100?

M100 is rated higher. ChkOBD OBD2 Analyzer averages 3.0 out of 5 from 4 ratings, while M100 averages 3.3 from 6 ratings.

### Do ChkOBD OBD2 Analyzer or M100 have ads?

Neither ChkOBD OBD2 Analyzer nor M100 shows ads.

### Which is updated more often, ChkOBD OBD2 Analyzer or M100?

ChkOBD OBD2 Analyzer ships an update every 3 months, and M100 every 3 weeks. Most recently, ChkOBD OBD2 Analyzer was updated on October 13, 2026 and M100 on October 24, 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.*