J1939FaultCode vs Auto Diag Solution
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
J1939FaultCode
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J1939 FaultCode is a practical offline diagnostic reference tool for commercial vehicle technicians, fleet maintenance teams, and engineers. Quickly look up J1939 SPN parameters, FMI definitions, combined DTC meanings, and brand-specific fault code mappings. The app is designed for fast field use, with built-in data and no internet connection required for core lookup features. Main features: Search SPN codes by number or keyword View FMI definitions with clear explanations Query DTC combinations using SPN + FMI Check common causes and repair suggestions Browse brand-specific fault code mappings Save frequently used codes to Favorites Review recent lookup history Switch between English and Chinese Works offline after installation Whether you are troubleshooting engine, aftertreatment, fuel, sensor, electrical, or communication faults, J1939 FaultCode helps you find useful reference information quickly and consistently.
Auto Diag Solution
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Auto Diag Solution est une application de diagnostic automobile permettant d'identifier les pannes, consulter les codes défaut, suivre l'entretien des véhicules, accéder à un garage virtuel et bénéficier d'un assistant IA spécialisé. Conditions d'utilisation (EULA) : https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Politique de confidentialité : https://autodiagsolution.com/privacy
Screenshots
Verdict
The clearest difference is device support: Auto Diag Solution at 3 against J1939FaultCode's 1. On price, update cadence, ads and in-app purchases 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. J1939FaultCode sells 1 one-off in-app purchase and Auto Diag Solution sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.
J1939FaultCode ships an update every 4 days, Auto Diag Solution every 5 days. The most recent releases landed on October 1, 2026 and September 26, 2026 respectively.
| Parameter | J1939FaultCode | Auto Diag Solution |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days — better | Every 5 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 11 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | 洋 刘 | Lopes Brice |
In-app purchases
J1939FaultCode
- J1939 Pro$2.99
Auto Diag Solution
- Auto Diag Pro Mensuel$6.991 Month
- Auto Diag Pro Annuel$49.991 Year
