J1939OBD vs Karpro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
J1939OBD
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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.
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.
- Find local mechanics
- Request quotes
- Schedule services
- Secure escrow payments
- Streamlined repair process
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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
Verdict
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
Both are free to download. J1939OBD sells 1 one-off in-app purchase. Karpro asks for nothing beyond the download.
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.
| Parameter | J1939OBD | Karpro |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 41 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.1 — better | 14.0 |
| Further details — not scored | ||
| Size | 14 MB | 79 MB |
| Age rating | 4+ | 4+ |
| Developer | S.Koepge | Karpro Corporation |
In-app purchases
J1939OBD
- Get full access for 1939OBD$3.99
Karpro
No in-app purchases









