Comparison

J1939OBD vs Karpro

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

Head to head
About

J1939OBD

Features
Read full description

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

Karpro

Find and book local mechanics for car maintenance and repairs. Request quotes, schedule services, and make secure payments through an escrow system. Enjoy a transparent and convenient car repair experience.

Highlights
  • Find local mechanics
  • Request quotes
  • Schedule services
  • Secure escrow payments
  • Streamlined repair process
Features
Read full description

Karpro connects users with skilled mechanics for all their automotive needs. Whether it's routine maintenance or complex repairs, users can easily find mechanics in their area, request quotes, and schedule services. Karpro offers a streamlined process where mechanics send quotes, and payments are securely handled through our escrow system. Once the service is completed to the user's satisfaction, the mechanic is paid. With Karpro, you get transparency, convenience, and reliability all in one app. Download Karpro and simplify your car repair experience today!

Screenshots

J1939OBD4 screens
Karpro4 screens

Verdict

The call

The clearest difference is in-app purchases: Karpro at none against J1939OBD's 1. Karpro also leads on update cadence (every 6 weeks vs every 41 months). J1939OBD's advantage is iOS requirement (12.1 vs 14.0). 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. Karpro asks for nothing beyond the download.

UpkeepUpdate frequency

J1939OBD ships an update every 41 months, Karpro every 6 weeks. The most recent releases landed on September 18, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 6 level
J1939OBD versus Karpro: the parameters behind the verdict, then further details
ParameterJ1939OBDKarpro
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 41 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPodiPhone, iPod
Requires iOS12.1 — better14.0
Further details — not scored
Size14 MB79 MB
Age rating4+4+
DeveloperS.KoepgeKarpro Corporation

In-app purchases

1 purchases

J1939OBD

One-time1
  • Get full access for 1939OBD$3.99
None

Karpro

No in-app purchases

Questions

Is J1939OBD free?
J1939OBD is free to download, with in-app purchases available.
Is Karpro free?
Karpro is free to download, with no in-app purchases.
Do J1939OBD or Karpro have ads?
Neither J1939OBD nor Karpro shows ads.
Which is updated more often, J1939OBD or Karpro?
J1939OBD ships an update every 41 months, and Karpro every 6 weeks. Most recently, J1939OBD was updated on September 18, 2026 and Karpro on October 3, 2026.

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