# FastR vs JB4 PRO

The clearest difference is in-app purchases: JB4 PRO at none against FastR's 2. JB4 PRO also leads on update cadence (fortnightly vs every 5 months) and review sentiment (50% vs 38%). FastR's advantage is ratings volume (319 vs 14). On price, rating, ads and device support there is nothing between them.

Both are free to download. FastR sells 2 one-off in-app purchases. JB4 PRO asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.4 for FastR against 4.4 for JB4 PRO. That said, the two scores are not equally well evidenced: FastR has 319 ratings behind it against 14, so its average is the more settled of the two. Written reviews are what separate them: 38% of FastR's written reviews are positive against 50% of JB4 PRO's.

FastR ships an update every 5 months, JB4 PRO fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | FastR | JB4 PRO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (319 ratings)](https://appshunter.io/ios/app/fastr-0-60-acceleration-test/id1296375567/reviews) | **[4.4 (14 ratings)](https://appshunter.io/ios/app/jb4-pro/id6746129072/reviews)** |
| Number of ratings | **319** | 14 |
| Positive reviews | 37.5% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 20 MB | 22 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Erhies Fekarurhobo](https://appshunter.io/developer/1296375566) | [Burger Motorsports, Inc](https://appshunter.io/developer/1815297026) |

## What reviewers say

### FastR

[App page](https://appshunter.io/ios/app/fastr-0-60-acceleration-test/id1296375567)

Measure your vehicle's acceleration performance with this app. It automatically tests 0-60 and quarter-mile times with millisecond accuracy. Compete with others on a real-time leaderboard and save results for different car models.

**Highlights:** Hands-free, automated acceleration testing, 0-60 and Quarter mile time measurement, Millisecond accuracy, Real-time user ranking, Save times for different car models

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 Leaderboard Posts | $3.99 | one-time |
| Unlock 1/4 Mile Timing | $5.99 | one-time |

**What reviewers like**

- 👍 Easy to use interface and simple design
- 💡 Innovative concept for testing 0-60 times without expensive equipment
- 🏆 Competitive leaderboard feature for sharing times
- 📱 Well-designed app layout
- ✅ Accurate readings for slower vehicles (6+ second 0-60 times)

**What reviewers complain about**

- 🐛 Severe GPS lag and timing delays (1-3+ seconds behind actual speed)
- ❌ Highly inaccurate for high-performance vehicles (sub-5 second 0-60)
- 🔌 Network connection issues preventing app functionality
- 📵 Login and authentication problems (Facebook-only requirement)
- ⚠️ Inconsistent and unreliable acceleration measurements

**Reported bugs**

- Network connection errors preventing vehicle selection
- Facebook login buffering and not connecting
- App fails to record and save acceleration times
- GPS speed readings lag significantly behind actual speed
- App crashes on launch or during use

**Requested features**

- GPS-based auto-start feature instead of manual start button
- Audio cues for 'ready, set, go' countdown
- Alternative login methods beyond Facebook
- Save vehicle selection for future sessions
- Support for multiple vehicles per account


### 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 FastR free?

FastR 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, FastR or JB4 PRO?

JB4 PRO is rated higher. FastR averages 4.4 out of 5 from 319 ratings, while JB4 PRO averages 4.4 from 14 ratings.

### Do FastR or JB4 PRO have ads?

Neither FastR nor JB4 PRO shows ads.

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

FastR ships an update every 5 months, and JB4 PRO fortnightly. Most recently, FastR was updated on October 24, 2026 and JB4 PRO on October 24, 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.*