# OBD2 Code vs Xm Diagrams

The clearest difference is update cadence: Xm Diagrams at every 4 months against OBD2 Code's every 47 months. OBD2 Code's advantage is rating (3.3 vs 3.0) and ratings volume (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

OBD2 Code holds the better App Store score, 3.3 against 3.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

OBD2 Code ships an update every 47 months, Xm Diagrams every 4 months. The most recent releases landed on September 14, 2026 and July 5, 2026 respectively.

## The numbers

| Metric | OBD2 Code | Xm Diagrams |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (3 ratings)](https://appshunter.io/ios/app/obd2-code/id492632063/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/xm-diagrams/id1537327999/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 39.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 47 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 2 MB | 32 MB |
| Requires iOS | **6.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Liang-Hung Publishing](https://appshunter.io/developer/340127474) | [Tramontana Szamitastechnikai Korlatolt Felelossegu Tarsasag](https://appshunter.io/developer/1537327710) |

## What reviewers say

### OBD2 Code

[App page](https://appshunter.io/ios/app/obd2-code/id492632063)

This app serves as a reference for standard Diagnostic Trouble Codes (DTCs). It helps users understand fault codes generated by a vehicle's onboard computer, aiding in problem diagnosis.

**Highlights:** Diagnostic Trouble Code reference, Vehicle fault code lookup, Problem diagnosis aid

**Features:** macOS Compatibility

**In-app purchases:** none


### Xm Diagrams

[App page](https://appshunter.io/ios/app/xm-diagrams/id1537327999)

Access detailed automotive information for the Citroën Xm, including schematic diagrams, wiring layouts, and technical data. Features include an ORGA calculator, error code readouts, and a fuse voltage drop calculator.

**Highlights:** Schematic diagrams and wiring layouts, Wiring harnesses information, Engine, fluids, and filter data, ORGA calculator, Error code readouts with explanations, Fuse voltage drop calculator, Printable circuit diagrams

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OBD2 Code free?

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

### Is Xm Diagrams free?

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

### Which has better reviews, OBD2 Code or Xm Diagrams?

OBD2 Code is rated higher. OBD2 Code averages 3.3 out of 5 from 3 ratings, while Xm Diagrams averages 3.0 from 1 ratings.

### Do OBD2 Code or Xm Diagrams have ads?

Neither OBD2 Code nor Xm Diagrams shows ads.

### Which is updated more often, OBD2 Code or Xm Diagrams?

OBD2 Code ships an update every 47 months, and Xm Diagrams every 4 months. Most recently, OBD2 Code was updated on September 14, 2026 and Xm Diagrams on July 5, 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.*