# JB4 Mobile vs POWER TUNER App

The clearest difference is price: POWER TUNER App at Free against JB4 Mobile's $27.99. JB4 Mobile's advantage is rating (3.8 vs 3.2) and review sentiment (52% vs 27%). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

POWER TUNER App is free to download; JB4 Mobile costs $27.99 up front. Neither carries in-app purchases, so what you see is what you pay.

JB4 Mobile holds the better App Store score, 3.8 against 3.2. Both are backed by a comparable volume of ratings — 239 and 82 respectively. Written reviews point the same way: 52% of JB4 Mobile's written reviews are positive against 27% of POWER TUNER App's.

Both ship on a similar rhythm, roughly every 3 months. Both last shipped on October 26, 2026.

## The numbers

| Metric | JB4 Mobile | POWER TUNER App |
| --- | --- | --- |
| Price | $27.99 | **Free** |
| Rating | **[3.8 (239 ratings)](https://appshunter.io/ios/app/jb4-mobile/id794841332/reviews)** | [3.2 (82 ratings)](https://appshunter.io/ios/app/power-tuner-app/id1235945328/reviews) |
| Number of ratings | **239** | 82 |
| Positive reviews | **52.4% of reviews** | 26.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Best chart rank | **#7** | — |
| Size | 24 MB | 14 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dmac Mobile Developments, LLC](https://appshunter.io/developer/372235786) | [Yamaha Motor Co., Ltd.](https://appshunter.io/developer/337268490) |

## What reviewers say

### JB4 Mobile

[App page](https://appshunter.io/ios/app/jb4-mobile/id794841332)

**Currently charting:** #7 Top Paid · Sports (US App Store)

This app acts as a mobile data logger and display for vehicles equipped with a JB4 tuner. It allows users to monitor and log various engine parameters, view data in real-time, and adjust settings for performance tuning.

**Highlights:** Live gauge monitoring, Data logging and graphing, User adjustable settings, WMI settings modification, On-the-fly map switching, Code reading and deletion

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Great app and a must have with the JB4
- 🔒 Robust security features
- 👍 Awesome data logging
- 👍 Incredible Support
- 👍 Works as expected

**What reviewers complain about**

- 🐛 Doesn't work properly, screen upside down and backwards
- 🐛 Stopped working after update
- 🐛 Bluetooth connection issues
- 🐛 Gauges freezing
- 🐛 Screen turns off

**Reported bugs**

- App crashes
- Can't connect to server
- Mirrored/inverted display
- Compatibility issues with new iOS versions
- Trouble logging in

**Requested features**

- Add CarPlay support
- Allow customizing map names
- Add more gauge styling options
- Improve UI and layout
- Integrate with Apple Carplay


### POWER TUNER App

[App page](https://appshunter.io/ios/app/power-tuner-app/id1235945328)

Optimize your Yamaha motorcycle's performance for racing. Adjust engine and suspension settings, monitor real-time machine data, and track lap times. Features include mapping, traction control, launch control, and an ECU lock for theft deterrence.

**Highlights:** Engine and suspension tuning, Real-time machine data monitoring, Lap time tracking, Traction and launch control, ECU lock for theft deterrence, Setup guide

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use for tuning
- 💡 Comprehensive maintenance log
- 🚀 FI/IG tuning is amazing
- 👍 App is great when it works
- 👍 Adjustability is amazing

**What reviewers complain about**

- 🐛 Freezing/crashing in menus
- 🐛 Connectivity issues
- 🐛 App not working with iOS 14
- 🐛 ECU lock greyed out
- 🐛 No power tuning for WR450F

**Reported bugs**

- FI/IG tuning menu freezes
- ECU lock greyed out and shows error message
- App freezes when accessing maps sub menu
- Mapping edit screen is unresponsive
- Cannot connect to WiFi/bike after 120 hours

**Requested features**

- Add Russian language support
- Add Portuguese language support
- Add Spanish language support
- Add French language support
- Add Chinese language support


## Frequently asked questions

### Is JB4 Mobile free?

JB4 Mobile costs $27.99, with no in-app purchases.

### Is POWER TUNER App free?

POWER TUNER App is free to download, with no in-app purchases.

### Which has better reviews, JB4 Mobile or POWER TUNER App?

JB4 Mobile is rated higher. JB4 Mobile averages 3.8 out of 5 from 239 ratings, while POWER TUNER App averages 3.2 from 82 ratings.

### Do JB4 Mobile or POWER TUNER App have ads?

Neither JB4 Mobile nor POWER TUNER App shows ads.

### Which is updated more often, JB4 Mobile or POWER TUNER App?

JB4 Mobile ships an update every 3 months, and POWER TUNER App every 3 months. Most recently, JB4 Mobile was updated on October 26, 2026 and POWER TUNER App on October 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*