OBD2 Code vs Xm Diagrams
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OBD2 Code
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.
- Diagnostic Trouble Code reference
- Vehicle fault code lookup
- Problem diagnosis aid
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Standard Diagnostic Trouble Codes reference book. A Diagnostic Trouble Code is set in a vehice's onboard computer when a fault occurs in any monitored system. The code number corresponds to the type of fault, and can be used to diagnose the problem.
Xm Diagrams
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.
- 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
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Automotive information about the Citroën Xm: - schematic diagrams and wiring layouts - wiring harnesses - engine, fluids, lubricants, filters, electrical and other data - ORGA calculator - error code readouts with explanation - car exterior colours - fuse voltage drop calculator - search parts by name or manufacturer position number - support for printing the circuit diagrams
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | OBD2 Code | Xm Diagrams |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (3 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 39.1% of reviews | — |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 47 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 6.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 2 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Liang-Hung Publishing | Tramontana Szamitastechnikai Korlatolt Felelossegu Tarsasag |
Customer experience
OBD2 Code
Xm Diagrams
In-app purchases
OBD2 Code
No in-app purchases
Xm Diagrams
No in-app purchases
