# M vs OBD2 Cat

The clearest difference is rating: OBD2 Cat at 5.0 against M's 1.0. OBD2 Cat also leads on update cadence (fortnightly vs every 2 months). M's advantage is iOS requirement (11.0 vs 16.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

OBD2 Cat holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

M ships an update every 2 months, OBD2 Cat fortnightly. The most recent releases landed on November 3, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | M | OBD2 Cat |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/m-key/id1597710955/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/obd2-cat-car-scanner/id6751106245/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 56 MB | 15 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Zhongshan Auto Electronics Technology Co.Ltd.](https://appshunter.io/developer/1039851711) | [Roman Tikhonychev](https://appshunter.io/developer/1833446011) |

## What reviewers say

### M

[App page](https://appshunter.io/ios/app/m-key/id1597710955)

Control your car remotely using your iPhone. Functions include arming, disarming, and locating your vehicle via Bluetooth 4.0 connection to a digital key system.

**Highlights:** Remote car arming, Remote car disarming, Vehicle location finder, Bluetooth 4.0 connectivity, iPhone control

**Features:** macOS Compatibility

**In-app purchases:** none


### OBD2 Cat

[App page](https://appshunter.io/ios/app/obd2-cat-car-scanner/id6751106245)

This app reads diagnostic trouble codes and live vehicle data from compatible cars using a Bluetooth OBD2 adapter. It helps drivers understand dashboard warnings by checking engine codes, viewing sensor data, and retrieving vehicle identification information.

**Highlights:** Read diagnostic trouble codes (DTCs), Clear supported trouble codes, View live engine and sensor data, Check VIN, make, model, and year, Auto Scan for codes, View OBD protocol and connection status

**In-app purchases:** none


## Frequently asked questions

### Is M free?

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

### Is OBD2 Cat free?

OBD2 Cat is free to download, with no in-app purchases.

### Which has better reviews, M or OBD2 Cat?

OBD2 Cat is rated higher. M averages 1.0 out of 5 from 1 ratings, while OBD2 Cat averages 5.0 from 2 ratings.

### Do M or OBD2 Cat have ads?

Neither M nor OBD2 Cat shows ads.

### Which is updated more often, M or OBD2 Cat?

M ships an update every 2 months, and OBD2 Cat fortnightly. Most recently, M was updated on November 3, 2026 and OBD2 Cat on November 12, 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.*