# Log Dyno vs JB4 PRO

The clearest difference is price: JB4 PRO at Free against Log Dyno's $13.99. JB4 PRO also leads on rating (4.4 vs 3.4) and review sentiment (50% vs 15%). Log Dyno's advantage is iOS requirement (9.0 vs 16.0). On ratings volume, ads, in-app purchases and device support there is nothing between them.

JB4 PRO is free to download; Log Dyno costs $13.99 up front. Neither carries in-app purchases, so what you see is what you pay.

JB4 PRO holds the better App Store score, 4.4 against 3.4. Both are backed by a comparable volume of ratings — 10 and 14 respectively. Written reviews point the same way: 15% of Log Dyno's written reviews are positive against 50% of JB4 PRO's.

Log Dyno ships an update every 4 months, JB4 PRO fortnightly. The most recent releases landed on October 13, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Log Dyno | JB4 PRO |
| --- | --- | --- |
| Price | $13.99 | **Free** |
| Rating | [3.4 (10 ratings)](https://appshunter.io/ios/app/log-dyno/id1453544823/reviews) | **[4.4 (14 ratings)](https://appshunter.io/ios/app/jb4-pro/id6746129072/reviews)** |
| Number of ratings | 10 | **14** |
| Positive reviews | 15.4% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Paid | **Free** |
| Size | 128 MB | 22 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Adam Keninger](https://appshunter.io/developer/966549024) | [Burger Motorsports, Inc](https://appshunter.io/developer/1815297026) |

## What reviewers say

### 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


### JB4 PRO

[App page](https://appshunter.io/ios/app/jb4-pro/id6746129072)

Integrate your performance tuner with your smartphone to adjust engine maps, view real-time data, and manage system settings. This app requires a specific Bluetooth adapter for full functionality.

**Highlights:** Change maps, Monitor live engine data, Record logs, Manage fault codes, Update JB4 firmware, Smartphone integration

**In-app purchases:** none


## Frequently asked questions

### Is Log Dyno free?

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

### Is JB4 PRO free?

JB4 PRO is free to download, with no in-app purchases.

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

JB4 PRO is rated higher. Log Dyno averages 3.4 out of 5 from 10 ratings, while JB4 PRO averages 4.4 from 14 ratings.

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

Neither Log Dyno nor JB4 PRO shows ads.

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

Log Dyno ships an update every 4 months, and JB4 PRO fortnightly. Most recently, Log Dyno was updated on October 13, 2026 and JB4 PRO on October 1, 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.*