Comparison

J1939OBD vs SCA LMS

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

Head to head

J1939OBD

Diagnose Tool für Motoren

SCA

About

J1939OBD

Features

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A diagnostic app for industrial and commercial vehicle engines using the J1939 CAN protocol. The app supports the following functions: - Display the active error codes - Display the passive error codes - Delete the error codes - Display of engine measured values - Information about the status DPF - Information about the SCR system - Information about fuel consumption - Engine information - Terminal mode To connect to the engine you need an EML327 compatible Wifi OBD interface as of V1.4 and a connection cable from the diagnostic connector to OBD. Various manufacturers offer corresponding cables, as well as a well-known engine manufacturer from Cologne, who distributes a corresponding adapter cable via his dealer network. Visit my homepage for further informations. An EML327 Wifi interface is offered on known Internet platforms.

About

SCA LMS

Features

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This app mainly focuses on storing students' and teachers' attendance and asking permission.

Screenshots

J1939OBD4 screens

SCA LMS3 screens

Verdict

The call

The clearest difference is in-app purchases: SCA LMS at none against J1939OBD's 1. SCA LMS also leads on update cadence (every 3 weeks vs every 41 months). J1939OBD's advantage is iOS requirement (12.1 vs 15.0). On price, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. J1939OBD sells 1 one-off in-app purchase. SCA LMS asks for nothing beyond the download.

UpkeepUpdate frequency

J1939OBD ships an update every 41 months, SCA LMS every 3 weeks. The most recent releases landed on September 18, 2026 and October 9, 2026 respectively.

Scorecard3 real differences · 3 level

J1939OBD versus SCA LMS: the parameters behind the verdict, then further details
Parameter	J1939OBD	SCA LMS
Price	Free	Free
Update frequency	Every 41 months	Every 3 weeks — better
Ads	No	No
In-app purchases	Yes	No — better
Devices	iPhone, iPod	iPhone, iPad, iPod — better
Requires iOS	12.1 — better	15.0
Further details — not scored
Size	14 MB	30 MB
Age rating	4+	17+
Developer	S.Koepge	Vannak Seng

In-app purchases

1 purchases

J1939OBD

One-time1

Get full access for 1939OBD$3.99

None

SCA LMS

No in-app purchases

Questions

Is J1939OBD free?

J1939OBD is free to download, with in-app purchases available.

Is SCA LMS free?

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

Do J1939OBD or SCA LMS have ads?

Neither J1939OBD nor SCA LMS shows ads.

Which is updated more often, J1939OBD or SCA LMS?

J1939OBD ships an update every 41 months, and SCA LMS every 3 weeks. Most recently, J1939OBD was updated on September 18, 2026 and SCA LMS on October 9, 2026.