LapTrax - Advanced Lap Timer

235 reviews
Content rating
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About this app

Race anywhere, anytime!

World's first automatic, camera-based lap timing app for athletes, coaches, and RC vehicles, including vehicles/multirotors/quad/drones. Great for runners, swimmers, sports (hockey,soccer,etc), anywhere you run drills, training routines, sprints or races. NO TRANSPONDERS, GPS OR EXTRA HARDWARE NEEDED! (and NO ADS)

Works great on an older/spare device (Android 5/Lollipop and up)

4 Modes of operation:

Manual/Tap: record laps for 1-4 racers by screen-tap, or by using headphone/bluetooth device buttons
Motion Detection: use device camera to automatically record laps for a single racer
ColorTrax: use device camera to automatically record laps for 1-4 racers based on a unique color on each racer
Remote Link: listen to a race on your own device, great for spectators, or rc drivers

Using the advance, camera-based modes, you can register a race participant and the app will keep track of the lap times each time they pass by the camera, automatically. Track up to 4 colors or participants with one phone! Great for athletes, coaches, RC vehicles and more!

- configurable starting countdown, including starting-gate lights
- announcements of lap time, lap number, and comments during race
- false-start detection, final-lap (bell-lap) sounds and announcement
- race summary announcements (fastest/slowest/average laptime)
- automatic start/restart mode when participants line-up at starting line/take their mark
- Virtual Racers: race against any previous racer by reloading their laptimes
- shareable race lap-time chart/graph, mix results from previous races
- Photo Scrapbook: automatically takes photos of racer as they pass the camera
- Bluetooth speaker and wired/wireless headphones compatible, listen to announcements, and start/stop/lap functions
- CAST-compatible, send audio/video to chromeCAST TV for big-screen, scoreboard experience

- Photos / Media / Files: for Photo Scrapbook, Save to Gallery option
- Storage: for Share Chart option
- Camera: for camera-based lap tracking options
- WIFI/Bluetooth/Network: for local remote link functions and crashlytics reporting

- BETA TESTERS NEEDED: join beta group

- click here for website / discussion
- click here for RCGROUPS.COM online discussion forum

- Crashlytics reports do not contain any personal information
- No data or other information is transmitted, or sent to any servers
- User preferences/settings are stored on device
Updated on
Jan 7, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

222 reviews
A Google user
December 21, 2018
Fantastic App! I love the display and motion detection! Spoken lap times are tremendously valuable! Works flawlessly on S9+ I would like to see a YouTube video on how to use each function. A listing of laps and times at the end of a race would be nice. It only gives a partial list. I would love to see a Minimum Lap Time option to weed out false double lap captures like what can happen when your RC car crashes in front of the camera. Whomever it was that made this app, Great Work!!!
18 people found this review helpful
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Protocol Apps
January 10, 2019
thanks for the kind words, and suggestions! Be sure to check out the chart/graph feature by swiping left on the main screen. From the chart screen you can export the laptimes by clicking the colortrax/menu button. protocol
July 11, 2022
I needed a consistent and audible lap timer that was quick to reset on the fly and keep stats on performance. This is very snappy! Short (read as: brief) learning curve for basic feature customization (depending on how you want to set it up), but very well designed, customizable, and consistent. Voice feedback customization is a big plus in my book!
7 people found this review helpful
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Barron Shurn
February 10, 2021
I am using this for tiny whoop drone racing practice at home. Amazed at how well it works. I do wish it would allow fixed time races vs fixed lap. Also I wish the first lap time would start when I cross the line vs the countdown Is there a way to donate to the developers? EDIT: It does have a rolling start feature. I struggle to get laps recorded consistently. Some tracks I can find the perfect spot, other times it's a bunch of trial and error and it misses laps occasionally.
7 people found this review helpful
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Protocol Apps
November 18, 2021
Hi, there is a "max-time" mode where you set the max time for a race, and the timer will stop afterwards, is that what you mean? Long-click the clock icon near the bottom-right to activate it. thanks!

What's new

- FIX: race summary announcement
- FIX: motion detection bug
- FIX: re-register background

- NEW: auto-restore previous racers/settings
- NEW: unlimited laps/practice mode (set laps = 0)
- NEW: highlight fastest lap in Chart/Text view
- FIX: colortrax / set exposure (re-register background)
- FIX: save/delete charts with Android 10+
- BETA: enable camera light during race/setup (settings/beta)