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 2000 pre-made race tracks
• Custom user defined circuit and point-to-point tracks
• Smoothly scrolling data analysis with synchronised graph, map and 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
• Remote control of GoPro® HERO 2, 3, 3+, 4, 5, 6, 7 and 8 cameras ¹⁾ ²⁾
• Linking and synchronising video files from almost all action cameras
• Support for external GPS receivers; Dual XGPS 150/160, Qstarz BL-818GT/BL-1000GT, VBOX Sport, RaceBox, PGEAR P600, Bad Elf GPS, Garmin GLO
• Support for OBD-II readers; OBDLink MX+ Bluetooth, 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

¹⁾ Only available on iOS 10 and newer
²⁾ This product and/or service is not affiliated with, endorsed by, or in any way associated with GoPro Inc. or its products and services. GoPro, HERO, and their respective logos are trademarks or registered trademarks of GoPro, Inc.

What’s New

Version 7.0.9

- Fixed: Another Audio/Video codec failure when exporting a session with more than two source video files
- Fixed: Speed delta channel was not selectable for analysis

Ratings and Reviews

4.7 out of 5
32 Ratings

32 Ratings

rlcowley ,

Hands down winner

This is my firs time reviewing an app, that’s how extremely satisfied I am with RC Pro. I’ve tried Harry’s Lap Timer and Track Addict. RC Pro has the best and most simplest and reliable functionality but my favorite feature is the analysis tools. Harry’s and Track Addict can’t hold a candle to RC Pro! There’s lots of data available, it’s simple to interpret and consume and an invaluable post race tool that has undoubtedly left me a better racer and faster driver.

zpower86 ,

Great reliable data analysis and predictive timing

This app is awesome! Way better than others I've tried (Harry's, solostorm, track addict, etc) and it's priced right. I have it paired with my 20Hz VBOX Sport GPS (also highly recommend). I mainly use it for predictive timing and data analysis between sessions or post event (SCCA autocross and karting so far).

The interface for setting up devices is intuitive and I've had no reliability issues after using this app for about 12 separate events.

I like that u can set or change start/finish markers before or after running. The ability to toggle "Driving line color channel" is a cool feature as well. I usually set it to Time Delta.

I gave only 4 stars because of one needed improvement. In session Data analysis, the line colors are confusing since the baseline lap color is the same as the lap you're analyzing. There either needs to be a larger difference between the colors, or a label/legend added at the bottom.

Developer Response ,

Thank you for the detailed feedback! Also the product improvement idea is welcome, I will consider this.

mjk3888 ,

Doesn’t work! Waste of $19!

I ran this app at both Road Atlanta and Daytona. Neither time was the gps accurate enough to even remotely function properly. You have to buy a better gps for $100+ for it to work. It should be noted in the description that my phone’s gps (iPhone 8) isn’t accurate enough.

In response to the developer’s note below, my phone was mounted to the front windshield not in my pocket. I have a 100% stock Camaro SS 1LE, it certainly isn’t a racecar.

Again you need to note on the app that it requires an external GPS!

Developer Response ,

Hi, sorry for the bad experience. The iPhone 8 is quite OK for casual track days, but you cannot have the phone in your pocket. A phone holder is needed to keep it in view of the sky (and the satellites). If you have a racing car with high corner speeds, or need to keep the phone in your pocket, only then external GPS is absolutely required. You may also want to get an external GPS to improve data quality for better analysis.

Update: Yes, maybe the expectations could be managed better, but let me assure you that the app works even with the internal GPS on iPhone 8. This has been tested repeatedly. Naturally it will work better with the external GPS. It may be, that in your case there was something else that affected the data quality, such as device malfunction. Also it could be your expectation of the quality of the collected data was just too high. If you'd like to continue the discussion, you're welcome to contact RaceChrono support, and we could take a look at the recorded sessions together.

App Privacy

The developer, RaceChrono Oy, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer's privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Purchases
  • Contact Info
  • Identifiers

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


RaceChrono Oy
43.2 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Italian, Japanese, Portuguese, Russian, Simplified Chinese, Spanish

Age Rating
This app may use your location even when it isn't open, which can decrease battery life.
In-App Purchases
  1. Reference session 1 $8.99
  2. Reference session 3 $0.99
  3. Reference session 2 $4.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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