# ROUSH Lap Timer vs JB4 PRO

The clearest difference is review sentiment: JB4 PRO at 50% against ROUSH Lap Timer's 0%. JB4 PRO also leads on price (Free vs $27.99) and rating (4.4 vs 1.0). ROUSH Lap Timer's advantage is iOS requirement (12.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

JB4 PRO is free to download; ROUSH Lap Timer costs $27.99 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 1.0. That said, the two scores are not equally well evidenced: JB4 PRO has 14 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of ROUSH Lap Timer's written reviews are positive against 50% of JB4 PRO's.

ROUSH Lap Timer ships an update every 3 months, JB4 PRO fortnightly. The most recent releases landed on September 18, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | ROUSH Lap Timer | JB4 PRO |
| --- | --- | --- |
| Price | $27.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/roush-lap-timer/id1036143036/reviews) | **[4.4 (14 ratings)](https://appshunter.io/ios/app/jb4-pro/id6746129072/reviews)** |
| Number of ratings | 1 | **14** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Paid | **Free** |
| Size | 71 MB | 22 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Harald Schlangmann](https://appshunter.io/developer/307688601) | [Burger Motorsports, Inc](https://appshunter.io/developer/1815297026) |

## What reviewers say

### ROUSH Lap Timer

[App page](https://appshunter.io/ios/app/roush-lap-timer/id1036143036)

Record and analyze your vehicle's performance on the track. This app generates in-car video with data overlays and allows for detailed performance analysis to help improve your driving.

**Highlights:** Record vehicle performance, Analyze track data, Generate in-car video with data overlays, Measure performance impact, Integrate with Health Kit data

**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 ROUSH Lap Timer free?

ROUSH Lap Timer costs $27.99, with no in-app purchases.

### Is JB4 PRO free?

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

### Which has better reviews, ROUSH Lap Timer or JB4 PRO?

JB4 PRO is rated higher. ROUSH Lap Timer averages 1.0 out of 5 from 1 ratings, while JB4 PRO averages 4.4 from 14 ratings.

### Do ROUSH Lap Timer or JB4 PRO have ads?

Neither ROUSH Lap Timer nor JB4 PRO shows ads.

### Which is updated more often, ROUSH Lap Timer or JB4 PRO?

ROUSH Lap Timer ships an update every 3 months, and JB4 PRO fortnightly. Most recently, ROUSH Lap Timer was updated on September 18, 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.*