Comparison

TOPIX vs J1939FaultCode

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

TOPIX

Features
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Jederzeit auf wichtige Daten zugreifen, Zeiten erfassen oder Termine verwalten Die TOPIX App bietet direkten Online-Zugriff auf zentrale Unternehmensdaten Ihrer TOPIX Installation. Sie kΓΆnnen im Handumdrehen detaillierte Firmen-, Personen-, CRM-, Termin-, Projekt-, Korrespondenz-, Vorgangs- und Serviceticket-Informationen sowie Artikel- und Preisinformationen abfragen. Funktionsumfang - Firmen mit allen verknΓΌpften Daten - Terminkalender - Dashboard - Artikel - Tickets - Projekte - Leistungserfassung - Ressourcen - Tasks

About

J1939FaultCode

Features
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J1939 Fault Code Lookup is the offline diagnostic reference for commercial-vehicle technicians, fleet mechanics and field engineers. Decode SAE J1939 diagnostic trouble codes in seconds β€” no internet connection required. KEY FEATURES β–  SPN Search Look up Suspect Parameter Numbers by number or keyword. See full parameter definitions including unit, range and resolution. β–  FMI Reference 23 bundled FMI definitions (0–21 and 31). Uncovered identifiers are reported explicitly. β–  DTC Diagnosis Look up covered SPN + FMI combinations. The fault database has 61 SPNs, 23 FMIs and 57 brand mappings. FMI-based guidance is general reference, not manufacturer/model-specific diagnosis. β–  Equipment Fault Records Organize an equipment alias, date, multiple fault codes, notes and review status. Draft and preview for free; Pro saves, edits and exports text reports. Uncovered codes can be recorded without invented definitions. β–  Brand Fault Codes Cross-reference OEM codes from Cummins, Bosch, Weichai, Yuchai and common aftertreatment systems. β–  CAN Signal Database 2,900+ J1939 messages and 16,000+ signal definitions with start bit, length, scaling, offset, range and enum values β€” perfect for calibration and network troubleshooting. β–  Favorites & History Bookmark frequently used codes; your search history is saved automatically. β–  100% Offline Every database is built into the app. Underground garage, remote job site, no signal β€” it just works. PRO UPGRADE (one-time purchase) β€’ Removes all ads (banner + interstitial) β€’ Unlimited signal database detail views (free tier: 3 per day) β€’ Save/edit local equipment records and export multi-fault text reports One-time purchase. Saved records remain viewable, deletable and exportable after revocation. Existing basic lookups, favorites/history and single-code copying/sharing stay free. WHO IS IT FOR Truck, bus and heavy-equipment technicians, service engineers, fleet managers, automotive electronics and calibration engineers, vocational students. DISCLAIMER All information is provided for reference only. Always consult the OEM's official service documentation before performing repairs. Records stay on your device, with no account or cloud sync. Export before deleting the app. Lookups and records work offline; purchases, restores and ads need a network connection.

Screenshots

TOPIX4 screens
J1939FaultCode4 screens

Verdict

The call

The clearest difference is in-app purchases: TOPIX at none against J1939FaultCode's 1. TOPIX also leads on ads (none vs shown) and device support (3 vs 1). J1939FaultCode's advantage is update cadence (fortnightly vs every 2 months). On price there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. J1939FaultCode sells 1 one-off in-app purchase. TOPIX asks for nothing beyond the download.

UpkeepUpdate frequency

TOPIX ships an update every 2 months, J1939FaultCode fortnightly. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

Scorecard5 real differences Β· 1 level
TOPIX versus J1939FaultCode: the parameters behind the verdict, then further details
ParameterTOPIXJ1939FaultCode
PriceFreeFree
Update frequencyEvery 2 monthsFortnightly β€” better
AdsNo β€” betterYes
In-app purchasesNo β€” betterYes
DevicesiPhone, iPad, iPod β€” betteriPhone
Requires iOS12.0 β€” better16.0
Further details β€” not scored
Size46 MB14 MB
Age rating4+4+
DeveloperTOPIX Business Software AGζ΄‹ 刘

In-app purchases

None

TOPIX

No in-app purchases

1 purchases

J1939FaultCode

One-time1
  • J1939 Pro$2.99

Questions

Is TOPIX free?
TOPIX is free to download, with no in-app purchases.
Is J1939FaultCode free?
J1939FaultCode is free to download, with in-app purchases available.
Do TOPIX or J1939FaultCode have ads?
J1939FaultCode shows ads; TOPIX does not.
Which is updated more often, TOPIX or J1939FaultCode?
TOPIX ships an update every 2 months, and J1939FaultCode fortnightly. Most recently, TOPIX was updated on November 8, 2026 and J1939FaultCode on November 5, 2026.

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