FastR vs JB4 PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FastR
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.
- Hands-free, automated acceleration testing
- 0-60 and Quarter mile time measurement
- Millisecond accuracy
- Real-time user ranking
- Save times for different car models
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FastR is the #1 vehicle acceleration performance app in the game! Test your vehicle's 0-60 and Quarter mile times, in a hands-free, fully automated manner. You can also post your acceleration times to our leaderboard to earn bragging rights. - Features accuracy to the millisecond - Displays your rank amongst other users in real time - Lets you save acceleration times from different car models See how your vehicle's acceleration performance compares with others.
JB4 PRO
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.
- Change maps
- Monitor live engine data
- Record logs
- Manage fault codes
- Update JB4 firmware
- Smartphone integration
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Smart phone integration for your JB4 performance tuner to change maps, monitor live engine data, record logs, manage fault codes, update JB4 firmware, and much more! Note the JB4 PRO free app requires the JB4 PRO BT adapter and is not compatible with the JB4 Mobile BT adapter.
Screenshots
Verdict
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 (290 vs 14). On price, rating, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 290 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. The most recent releases landed on September 18, 2026 and September 13, 2026 respectively.
| Parameter | FastR | JB4 PRO |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (290 ratings) | 4.4 (14 ratings) |
| Positive reviews | 37.5% of reviews | 50.0% of reviews — better |
| Number of ratings | 290 — better | 14 |
| Update frequency | Every 5 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 20 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Erhies Fekarurhobo | Burger Motorsports, Inc |
Customer experience
FastR
JB4 PRO
Bugs and requests
FastR
Reported bugs
10 issues- 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
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- Settings not saving properly without login
- Leaderboard functionality broken
- App doesn't start recording until vehicle is already at speed
- Inconsistent timing results on identical driving conditions
- Loading screen stuck on 'select vehicle' with persistent network errors
Requested features
10 requests- 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
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- Social media sharing integration
- In-app instructions and user guide
- Add missing car models (Tesla Model Y, Russian models, high-spec variants)
- Allow custom vehicle entry if model not found
- Real-time sound feedback during acceleration test
JB4 PRO
Not enough reviews yet to summarise bugs or requests.
In-app purchases
FastR
- 10 Leaderboard Posts$3.99
- Unlock 1/4 Mile Timing$5.99
JB4 PRO
No in-app purchases
