JB4 PRO

JB4 PRO

Exclusively for the JB4

15 ratings
4 reviews
Free

Details

Released
May 22, 2025
Updated
November 4, 2026
JB4 PRO screenshot #1 for iPhone
JB4 PRO screenshot #2 for iPhone
JB4 PRO screenshot #3 for iPhone
JB4 PRO screenshot #4 for iPhone
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About

Integrate your JB4 performance tuner with your smartphone to adjust maps, view live engine data, record performance logs, and manage fault codes. This free application also allows for firmware updates for compatible JB4 systems.

✓Map adjustment
✓Live engine data monitoring
✓Log recording
✓Fault code management
✓Firmware updates
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+1

What's New in JB4 PRO

1.5.6

November 4, 2026

Redesigned log view screen for easier analysis including a light/dark view mode.

User reviews

What are you waiting to develop a CarPlay compatible app??

Hey guys what are you waiting to develop a CarPlay compatible app?? It’s kind of basic to have nowadays those engine values in the screen of the car while you race!

BMS doesn’t care - App is garbage

For anything Jeep/Dodge/RAM/Alfa Romeo/Maserati this app is absolute garbage and BMS does not maintain it well. Get ready for limp mode!

Data logging

The app and data logging works great just like the mobile, but I’m on platform 125 (2.5T smartstream kia/hyundai) and for whatever reason when I’m reading a data log, it does not give me the option to enable cylinder one or “ign1” to see timing for cylinder one it’s not even in the options. List to be enabled when reading a data log.
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Good app, some bugs

Overall this is a great app. It could be easier to identify which firmware profiles you need and how to make changes. Clearing DME codes doesn’t work consistently. And it would be amazing if this could be CarPlay compatible, even just a gauge widget. Allow volunteers to help with Dev!

Developer apps

FAQ

What can JB4 PRO do?

JB4 PRO allows you to change maps, monitor live engine data, record logs, manage fault codes, and update the firmware for your JB4 performance tuner directly from your smartphone.

Is JB4 PRO free to use?

Yes, JB4 PRO is a free application. All JB4 systems sold from 2025 onwards are designed to use this app at no additional cost.

What devices does JB4 PRO support?

JB4 PRO is available for both iPhone and iPad devices, offering smartphone integration for your JB4 performance tuner.

How often is JB4 PRO updated?

The latest version of JB4 PRO is 1.5.6, and it was last updated on November 4, 2026. This indicates a recent update, suggesting ongoing support and development.

What is the age rating for JB4 PRO?

JB4 PRO has an age rating of 4+, making it suitable for a wide range of users. This rating suggests no mature content is present within the application.

Does JB4 PRO have ads?

No, JB4 PRO does not contain advertisements. The application is free to download and use without any ad interruptions.

How does JB4 PRO compare to other performance tuning apps?

JB4 PRO offers exclusive integration with JB4 performance tuners, providing specific features like map adjustment and firmware updates that may not be available in general OBD2 scanning apps.

What is the user sentiment for JB4 PRO?

JB4 PRO has a strong user rating of 4.4 stars based on 15 ratings, indicating that users generally have a positive experience with the application's functionality and performance.