# JB4 Mobile vs Log Dyno

The clearest difference is price: Log Dyno at $13.99 against JB4 Mobile's $27.99. Log Dyno also leads on iOS requirement (9.0 vs 15.1). JB4 Mobile's advantage is review sentiment (52% vs 15%) and rating (3.8 vs 3.4). On update cadence, ads, in-app purchases and device support there is nothing between them.

JB4 Mobile costs $27.99 and Log Dyno $13.99 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 3.4. That said, the two scores are not equally well evidenced: JB4 Mobile has 239 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 52% of JB4 Mobile's written reviews are positive against 15% of Log Dyno's.

JB4 Mobile ships an update every 3 months, Log Dyno every 4 months. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | JB4 Mobile | Log Dyno |
| --- | --- | --- |
| Price | $27.99 | **$13.99** |
| Rating | **[3.8 (239 ratings)](https://appshunter.io/ios/app/jb4-mobile/id794841332/reviews)** | [3.4 (10 ratings)](https://appshunter.io/ios/app/log-dyno/id1453544823/reviews) |
| Number of ratings | **239** | 10 |
| Positive reviews | **52.4% of reviews** | 15.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | **Free** | Paid |
| Best chart rank | **#7** | — |
| Size | 24 MB | 128 MB |
| Requires iOS | 15.1 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dmac Mobile Developments, LLC](https://appshunter.io/developer/372235786) | [Adam Keninger](https://appshunter.io/developer/966549024) |

## What reviewers say

### JB4 Mobile

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

**Currently charting:** #7 Top Paid · Sports, #194 Top Paid (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


### Log Dyno

[App page](https://appshunter.io/ios/app/log-dyno/id1453544823)

This app analyzes your car's datalog files to measure torque and horsepower using your mobile device. It provides detailed analysis, recommends optimal gear shifts, and allows comparison of multiple measurements.

**Highlights:** Measure torque and horsepower from datalogs, Virtual dyno analysis, Optimal gear shift recommendations, Compare multiple measurements, Supports various datalog file formats, Customizable vehicle data input

**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 Log Dyno free?

Log Dyno costs $13.99, with no in-app purchases.

### Which has better reviews, JB4 Mobile or Log Dyno?

JB4 Mobile is rated higher. JB4 Mobile averages 3.8 out of 5 from 239 ratings, while Log Dyno averages 3.4 from 10 ratings.

### Do JB4 Mobile or Log Dyno have ads?

Neither JB4 Mobile nor Log Dyno shows ads.

### Which is updated more often, JB4 Mobile or Log Dyno?

JB4 Mobile ships an update every 3 months, and Log Dyno every 4 months. Most recently, JB4 Mobile was updated on October 15, 2026 and Log Dyno on October 13, 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.*