# CarTest vs JB4 PRO

The clearest difference is in-app purchases: JB4 PRO at none against CarTest's 3. JB4 PRO also leads on ads (none vs shown). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. CarTest sells 3 in-app purchases, starting at $3.99 per 3 months. JB4 PRO asks for nothing beyond the download.

JB4 PRO holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 13 and 15 respectively. Written reviews point the same way: 44% of CarTest's written reviews are positive against 50% of JB4 PRO's.

CarTest ships an update monthly, JB4 PRO every 2 weeks. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | CarTest | JB4 PRO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (13 ratings)](https://appshunter.io/ios/app/cartest-performance-tester/id1534136951/reviews) | **[4.4 (15 ratings)](https://appshunter.io/ios/app/jb4-pro/id6746129072/reviews)** |
| Number of ratings | 13 | **15** |
| Positive reviews | 44.4% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 8 MB | 22 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Takao Ichimura](https://appshunter.io/developer/1474061593) | [Burger Motorsports, Inc](https://appshunter.io/developer/1815297026) |

## What reviewers say

### CarTest

[App page](https://appshunter.io/ios/app/cartest-performance-tester/id1534136951)

Measure your vehicle's acceleration performance with this tool. Easily track times like 0-60 mph or 0-1/4 mile. Useful for performance testing and safe driving awareness on public roads.

**Highlights:** Measure 0-60 mph and 0-1/4 mile times, Track acceleration on public roads, Repeatable measurements with Start/Sensing, Countdown start with false start detection, View and share previous results, Selectable speed units (km/h or mph)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Feature enhancements | $3.99 | per 3 months |
| Feature enhancements | $5.99 | per year |
| Feature enhancements | $9.99 | one-time |


### JB4 PRO

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

Integrate your JB4 performance tuner with your smartphone to adjust maps, view live engine data, record performance logs, and manage fault codes. This free application also allows for firmware updates for compatible JB4 systems.

**Highlights:** Map adjustment, Live engine data monitoring, Log recording, Fault code management, Firmware updates

**In-app purchases:** none


## Frequently asked questions

### Is CarTest free?

CarTest is free to download, with in-app purchases available.

### Is JB4 PRO free?

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

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

JB4 PRO is rated higher. CarTest averages 4.2 out of 5 from 13 ratings, while JB4 PRO averages 4.4 from 15 ratings.

### Do CarTest or JB4 PRO have ads?

CarTest shows ads; JB4 PRO does not.

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

CarTest ships an update monthly, and JB4 PRO every 2 weeks. Most recently, CarTest was updated on November 3, 2026 and JB4 PRO on November 5, 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.*