OBD JScan vs TrafoCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OBD JScan
This app provides advanced diagnostics for Jeep, Chrysler, and Dodge vehicles. It allows users to read and clear trouble codes, view live sensor data, and access settings across all vehicle modules, including ABS and transmission.
- Read/Clear Diagnostic Trouble Codes
- Access Live Data from all sensors
- View vehicle settings
- Access all vehicle modules (ABS, Transmission, etc.)
- Identify module, VIN, Part Number, and Version
- Share vehicle trouble codes
Read full descriptionHide full description
What is OBD JScan? OBD JScan is powerful Jeep & Chrysler & Dodge diagnostic application. JScan allows reading standard Diagnostic Trouble Codes (emission related), general Live Data and Adaptations and much more. Thats not all. JScan can access all modules avalable on your vehicle. ABS, Steering Column, Automatic Transimmsion, Radio, Sway Bar, Havac and many more. Some supported cars: Jeep Wrangler JK, Jeep Wrangler JL - additional hardware required to bypass security gateway* Jeep Wrangler JT - additional hardware required to bypass security gateway* Jeep Wrangler 4XE - additional hardware required to bypass security gateway* Jeep Grand Cherokee WK Jeep Grand Cherokee, WK2 11-13 Jeep Grand Cherokee WK2 14-21 - 18+ - additional hardware required to bypass security gateway* Jeep Commander XK Jeep Liberty/Cherokee KK, Jeep Compass, Jeep Patriot MK Dodge Avenger Dodge Grand Caravan RT, Dodge Journey, Dodge Caliber Dodge Durango 2004-2009 Dodge Durango 2011-2013 Dodge Durango 2014-2023* Dodge Ram Dodge Nitro Dodge Magnum Dodge Challenger - 08-14 Dodge Challenger - 14+ Dodge Charger- 06-10 Dodge Charger- 11+ Dodge Avenger Chrysler Town&Country RT Chrysler 200 Chrysler 300C Chrysler 300 Chrysler Sebring Chrysler Aspen and more.. * WK2 2018+ = requires securit bypass cable * Dodge Durango 2018+ = requires securit bypass cable * Dodge Ram 2018+ = requires securit bypass cable * JL requires security bypass cable * JT requires security bypass cable * http://jscan.net/jl-jt-security-bypass/ What can I Do with JScan? JScan allows you to access, diagnostic trouble codes and Live Data in all modules. You can easily Read, Clear, Share vehicle Trouble Codes. View Live Data from all sensors in vehicle. View vehicle settings. Identify module, Vin, Part Number, Version and more. Recommended device: - OBD ELM 327 compatible device is required to make app work as expected. Recommended adapters: - iCar Pro 4.0 Bluetooth LE (Bluetooth) - Vlinker MC+ (Bluetooth) - for newer cars - OBD Link MX+ Bluetooth (Bluetooth) More info about supported and recommended OBD adapters: http://jscan.net/supported-and-not-supported-obd-adapters/ Facebook: https://www.facebook.com/obdjscan/ Website: http://jscan.net/
TrafoCalc
Read full descriptionHide full description
TrafoCalc is a practical transformer calculation tool built specifically for field engineers, commissioning teams, and utility professionals. Designed for real-world use at substations and test sites, TrafoCalc provides fast, reliable calculations without spreadsheets or manual formulas. Key Features • Rated current calculation (HV & LV, 3-phase) • Transformer ratio calculation based on vector group • Full tap-changer support (Tap 1 = highest voltage) • Per-tap voltage and ratio calculation • ±0.5% ratio tolerance range for testing reference • Short-circuit current calculation • Supports common IEC vector groups (Dyn, YNd, Yy) • Clean, offline-ready interface Built for Professionals TrafoCalc follows IEC-based formulas and is suitable for: • Factory Acceptance Tests (FAT) • Site Acceptance Tests (SAT) • OLTC verification • Ratio testing reference • Substation commissioning No ads. No clutter. Just the calculations engineers actually need.
Screenshots
Verdict
The clearest difference is price: OBD JScan at Free against TrafoCalc's $0.99. OBD JScan also leads on iOS requirement (13.0 vs 18.2). TrafoCalc's advantage is in-app purchases (none vs 8) and update cadence (every 9 days vs every 3 weeks). On 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
OBD JScan is free to download; TrafoCalc costs $0.99 up front. OBD JScan sells 7 one-off in-app purchases. TrafoCalc asks for nothing beyond the download.
OBD JScan ships an update every 3 weeks, TrafoCalc every 9 days. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.
| Parameter | OBD JScan | TrafoCalc |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.7 (1.3K ratings) — better | — |
| Positive reviews | 79.6% of reviews | — |
| Number of ratings | 1.3K — better | — |
| Update frequency | Every 3 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.2 |
| Further details — not scored | ||
| Size | 403 MB | 4 MB |
| Age rating | 12+ | 4+ |
| Developer | Piotr Bialic | Mohd Dahnial Ismail |
Bugs and requests
OBD JScan
Reported bugs
2 issues- Inability to save/export diagnostic data
- Inconsistent behavior when changing vehicle settings
Requested features
4 requests- Expanded vehicle compatibility
- Improved stability and reliability
- Enhanced user interface and guidance
- Integration with other vehicle apps/services
TrafoCalc
Not enough reviews yet to summarise bugs or requests.
In-app purchases
OBD JScan
- + 1 garage license2 variants$9.99
- 1 VIN license$20.99
- Add 1 VIN$20.99
Show 4 moreShow fewer
- Add 1 VIN Vehicle Slot$20.99
- 3 VIN licenses$54.99
- 5 VIN Licenses$84.99
- 10 VIN Licenses$149.99
TrafoCalc
No in-app purchases
Questions
Is OBD JScan free?
Is TrafoCalc free?
Do OBD JScan or TrafoCalc have ads?
Which is updated more often, OBD JScan or TrafoCalc?
Other comparisons















