# PerfExpert vs JB4 PRO

The clearest difference is price: JB4 PRO at Free against PerfExpert's $8.99. JB4 PRO also leads on rating (4.4 vs 3.7) and in-app purchases (none vs 8). PerfExpert's advantage is review sentiment (63% vs 50%). On ratings volume, ads, device support and iOS requirement there is nothing between them.

JB4 PRO is free to download; PerfExpert costs $8.99 up front. PerfExpert sells 8 in-app purchases, starting at $11.99 per month. JB4 PRO asks for nothing beyond the download.

JB4 PRO holds the better App Store score, 4.4 against 3.7. Both are backed by a comparable volume of ratings — 12 and 14 respectively. Written reviews complicate that: 63% of PerfExpert's written reviews are positive against 50% of JB4 PRO's, so the app with the better star average is not the one people write more warmly about.

PerfExpert ships an update every 2 months, JB4 PRO every 2 weeks. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | PerfExpert | JB4 PRO |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | [3.7 (12 ratings)](https://appshunter.io/ios/app/perfexpert-car-dyno-hp-test/id549390700/reviews) | **[4.4 (14 ratings)](https://appshunter.io/ios/app/jb4-pro/id6746129072/reviews)** |
| Number of ratings | 12 | **14** |
| Positive reviews | **63.4% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 30 MB | 22 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Claude JOSEPH ANGELIQUE](https://appshunter.io/developer/549390703) | [Burger Motorsports, Inc](https://appshunter.io/developer/1815297026) |

## What reviewers say

### PerfExpert

[App page](https://appshunter.io/ios/app/perfexpert-car-dyno-hp-test/id549390700)

Transform your smartphone into a powerful onboard dyno to measure your car's engine power and torque with high accuracy. Verify tuning, remaps, and upgrades with detailed reports and interactive charts. No external sensors or car connection required.

**Highlights:** Engine power and torque measurement, 0-60 mph and 0-100 km/h acceleration times, Quarter mile and 400m times, Detailed reports with interactive charts, Correction standards (DIN, SAE, ISO, JIS, CEE), Customizable units, Export results as data files or images

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PerfExpert Pro | $11.99 | per month |
| PerfExpert Pro Max | $24.99 | per month |
| PerfExpert Pro | $89.99 | per year |
| PerfExpert Pro Max | $199.99 | per year |
| 1 Extra Car Profile | $3.99 | one-time |
| 3 Extra Car Profiles | $9.99 | one-time |
| 5 Extra Car Profiles | $14.99 | one-time |
| External GPS Unlock | $17.99 | one-time |


### 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 PerfExpert free?

PerfExpert costs $8.99, and also offers in-app purchases.

### Is JB4 PRO free?

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

### Which has better reviews, PerfExpert or JB4 PRO?

JB4 PRO is rated higher. PerfExpert averages 3.7 out of 5 from 12 ratings, while JB4 PRO averages 4.4 from 14 ratings.

### Do PerfExpert or JB4 PRO have ads?

Neither PerfExpert nor JB4 PRO shows ads.

### Which is updated more often, PerfExpert or JB4 PRO?

PerfExpert ships an update every 2 months, and JB4 PRO every 2 weeks. Most recently, PerfExpert was updated on October 26, 2026 and JB4 PRO on October 28, 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.*