RaceChrono Pro vs JB4 PRO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RaceChrono Pro
This app serves as a comprehensive lap timer and data logger for motorsports, enabling users to record and analyze performance. It offers video recording with data overlays and supports a wide range of external GPS and OBD-II devices for enhanced accuracy.
- Lap timing with sectors and optimal lap
- Track library with over 2600 pre-made tracks
- Data analysis with synchronized graphs and maps
- Predictive lap timing
- Video recording with data overlay
- Support for external GPS and OBD-II devices
- Unlimited session length
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RaceChrono Pro is a versatile lap timer, data logging and data analysis app designed especially for use in motorsports, replacing your traditional lap timers and data loggers. The RaceChrono Pro app also enables you to record videos and overlay them with the logged data. RaceChrono apps have a strong following, currently over 100000 active users. If you look around at pits during your race or track day, chances are that you’ll see someone using RaceChrono. Even many professionals, such as factory test drivers and race driving instructors, are known to use this app! No matter whether you ride motorbikes, drive go-karts or cars, on closed circuit or special stage tracks – this is the motorsports app for you. RaceChrono Pro has following major features: • Lap timing with sectors and optimal lap • Track library of over 2600 pre-made race tracks • Custom user defined circuit and point-to-point tracks • Smoothly scrolling data analysis with synchronised graph, X/Y graph, map, video and comparison video • Predictive lap timing and time delta graph • Hardware accelerated video export with configurable data overlay • Multiple camera recording and picture-in-picture video export • Video recording using internal camera • Linking and synchronising video files from almost all action cameras • Support for external GPS receivers; Dragy Pro/DRG70/DRG70-C/Lite, RaceBox Mini/Mini S/Micro, Qstarz BL-818GT/BL-1000GT/LT-8000GT, Columbus P-9 Race, Dual XGPS 150/160, VBOX Sport, Garmin GLO • Support for OBD-II readers; OBDLink MX+ Bluetooth, OBDLink CX Bluetooth, Dragy OBD, Vgate vLinker FS, Vgate vLinker/iCar BLE, PLX Kiwi 3/4, Carista OBD2 Bluetooth, Tonwon BLE 1/2/Pro, Veepeak OBDCheck BLE, UniCarScan UCSI-2000, OBDLink MX Wi-Fi, generic Wi-Fi OBD-II • Support for Bluetooth LE heart rate monitors • Unlimited session length, good for 24 hour races • Session data export in .ODS (session summary for Excel), .NMEA, .VBO and .CSV formats
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 price: JB4 PRO at Free against RaceChrono Pro's $19.99. JB4 PRO also leads on in-app purchases (none vs 3) and update cadence (fortnightly vs monthly). RaceChrono Pro's advantage is rating (4.7 vs 4.4) and ratings volume (174 vs 14). On review sentiment, ads, device support and iOS requirement 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
JB4 PRO is free to download; RaceChrono Pro costs $19.99 up front. RaceChrono Pro sells 3 one-off in-app purchases. JB4 PRO asks for nothing beyond the download.
RaceChrono Pro holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: RaceChrono Pro has 174 ratings behind it against 14, so its average is the more settled of the two. Written reviews point the same way: 57% of RaceChrono Pro's written reviews are positive against 50% of JB4 PRO's.
RaceChrono Pro ships an update monthly, JB4 PRO fortnightly. The most recent releases landed on September 25, 2026 and September 13, 2026 respectively.
| Parameter | RaceChrono Pro | JB4 PRO |
|---|---|---|
| Price | $19.99 | Free — better |
| Rating | 4.7 (174 ratings) — better | 4.4 (14 ratings) |
| Positive reviews | 57.4% of reviews — better | 50.0% of reviews |
| Number of ratings | 174 — better | 14 |
| Update frequency | Monthly | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Best chart rank | #10 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 43 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | RaceChrono Oy | Burger Motorsports, Inc |
Customer experience
RaceChrono Pro
JB4 PRO
In-app purchases
RaceChrono Pro
- Reference session 3$0.99
- Reference session 2$4.99
- Reference session 1$8.99
JB4 PRO
No in-app purchases








