# JB4 Mobile vs D

The clearest difference is price: D at Free against JB4 Mobile's $27.99. D also leads on iOS requirement (11.0 vs 15.1). JB4 Mobile's advantage is rating (3.8 vs 1.9) and review sentiment (52% vs 13%). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

D 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 1.9. Both are backed by a comparable volume of ratings — 239 and 126 respectively. Written reviews point the same way: 52% of JB4 Mobile's written reviews are positive against 13% of D's.

JB4 Mobile ships an update every 3 months, D every 5 months. Both last shipped on October 26, 2026.

## The numbers

| Metric | JB4 Mobile | D |
| --- | --- | --- |
| Price | $27.99 | **Free** |
| Rating | **[3.8 (239 ratings)](https://appshunter.io/ios/app/jb4-mobile/id794841332/reviews)** | [1.9 (126 ratings)](https://appshunter.io/ios/app/d-sport/id1169979276/reviews) |
| Number of ratings | **239** | 126 |
| Positive reviews | **52.4% of reviews** | 12.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Free | Free |
| Best chart rank | **#7** | — |
| Size | 24 MB | 68 MB |
| Requires iOS | 15.1 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dmac Mobile Developments, LLC](https://appshunter.io/developer/372235786) | [Dinan Corp](https://appshunter.io/developer/1036838407) |

## 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


### D

[App page](https://appshunter.io/ios/app/d-sport/id1169979276)

Control your engine's performance with a connected tuner. Adjust boost levels for fuel efficiency or increased power, choosing from five distinct settings. Monitor real-time and peak boost pressure directly from your smartphone.

**Highlights:** Adjust engine boost levels, 5 power settings (Valet, Stock, Sport, Sport+, Race), Monitor live boost pressure, Monitor peak boost pressure, Control engine performance

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

**In-app purchases:** none


## Frequently asked questions

### Is JB4 Mobile free?

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

### Is D free?

D is free to download, with no in-app purchases.

### Which has better reviews, JB4 Mobile or D?

JB4 Mobile is rated higher. JB4 Mobile averages 3.8 out of 5 from 239 ratings, while D averages 1.9 from 126 ratings.

### Do JB4 Mobile or D have ads?

Neither JB4 Mobile nor D shows ads.

### Which is updated more often, JB4 Mobile or D?

JB4 Mobile ships an update every 3 months, and D every 5 months. Most recently, JB4 Mobile was updated on October 26, 2026 and D 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.*