GPS Race Timer vs Cartomizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GPS Race Timer
Accurately measure vehicle acceleration times like 0-60 mph and 1/4 mile using your iPhone's GPS. Set up timers beforehand and let the app automatically start measurements when speed targets are met or motion is detected. Save, export, and transfer your performance data easily.
- Measure 0-60 mph, 60-120 mph, 1/4 mile
- Automatic start detection
- Save and export results
- Preset and adjustable timers
- No extra hardware required
- Optional PRO version features
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Measure acceleration times such as 0–60 mph, 60–120 mph and 1/4 mile directly with your iPhone — accurately and without extra hardware. The app is designed so it doesn’t need to be operated while driving; you just set everything up beforehand while stationary. Measurements then start automatically — when the target speed is reached or when a start is detected. You can save results locally on your iPhone and, if needed, export them or transfer them to other devices. Preset timers: 60 ft, 1/8 mile, 1/4 mile, 1/2 mile, 1 mile, 0 – 60 mph, 0 – 120 mph, 50 – 75 mph, 60 – 120 mph, 0 – 100 km/h, 0 – 200 km/h, 80 – 120 km/h, 100 – 200 km/h. All timers are, of course, fully adjustable. The free version measures up to two times per run. How to use the app: Check the timer settings on the start screen. If everything looks good, place your iPhone in the car where it has good GPS reception and is held securely, then start the acceleration test. You can adjust the timer configuration in the Settings screen (just tap the relevant timer). Then return to the race screen and follow the previous instruction. Optional PRO version (in-app purchase): 1. Up to four timers in parallel (instead of two) 2. Precise determination of elevation differences 3. Simulation of a Sportsman start and reaction-time measurement 4. No ad banners
Cartomizer
Visualize aftermarket wheels on your car before purchasing. This app uses AI to automatically detect and replace your current wheels with new ones, eliminating manual adjustments and camera angle concerns. Simply upload a photo of your car and try out different wheel styles.
- AI wheel detection and replacement
- Visualize wheels on your own car
- Automatic wheel adjustment
- No manual effort required
- Try different wheel styles
- Upload car photos
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Have you ever found yourself wondering which wheels look best on your ride? Looking to purchase a set of aftermarket wheels to set you apart from the rest but can't really decide? With Cartomizer you now have a fast and easy way to view wheels on your own ride before you buy them. Cartomizer uses artificial intelligence to detect your wheels and replace them automatically for you! No more manually adjusting wheels or any other kind of effort on your part. You don't even have to worry about the camera angle anymore - Just make sure the wheels are fully visible and we will take care of the rest. It’s this simple: 1. Take or upload a photo of your ride 2. Try different wheels and choose the wheels that look best on your ride 3. Contact us to get an offer
Screenshots
Verdict
GPS Race Timer and Cartomizer both sit at 4.5 stars, but that hides the real split: 86% of Cartomizer's written reviews are positive against 35% of GPS Race Timer's. Cartomizer also leads on ads (none vs shown) and update cadence (every 3 months vs every 7 months). GPS Race Timer's advantage is ratings volume (2.7K vs 518) and iOS requirement (12.2 vs 15.6). On price, rating, in-app purchases and monetization model 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. GPS Race Timer sells 1 one-off in-app purchase and Cartomizer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.5 for GPS Race Timer against 4.5 for Cartomizer. That said, the two scores are not equally well evidenced: GPS Race Timer has 2.7K ratings behind it against 518, so its average is the more settled of the two. Written reviews are what separate them: 35% of GPS Race Timer's written reviews are positive against 86% of Cartomizer's.
GPS Race Timer ships an update every 7 months, Cartomizer every 3 months. The most recent releases landed on September 20, 2026 and September 10, 2026 respectively.
| Parameter | GPS Race Timer | Cartomizer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2.7K ratings) | 4.5 (518 ratings) — better |
| Positive reviews | 34.7% of reviews | 86.4% of reviews — better |
| Number of ratings | 2.7K — better | 518 |
| Update frequency | Every 7 months | Every 3 months — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.2 — better | 15.6 |
| Further details — not scored | ||
| Size | 50 MB | 60 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Hagenau | Ron Levy |
Customer experience
GPS Race Timer
Cartomizer
User reviews
GPS Race Timer
From 2.7K App Store ratingsWhat we love
- 👍 Simple and easy to use
- 🚀 Accurate speed tracking
- 💡 Customizable settings
- 📊 Saves run data
Room to improve
- 🐛 Inconsistent 0-60 and quarter mile times
- 🐛 Fails to start/record runs
- 🐛 Inaccurate distance tracking
- 🐛 Compatibility issues with newer devices
Cartomizer
From 518 App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Helpful visual tool
- 💡 Useful for choosing wheels
- 👍 Realistic wheel visualization
- 👍 Excellent app
Room to improve
- 💰 Paid to add custom wheels
- 🐛 Limited wheel selection
- 🐛 Wheels look like 2D images
- 🐛 Inconsistent quality of wheel visualization
Bugs and requests
GPS Race Timer
Reported bugs
4 issues- Timer doesn't reset properly
- App crashes on startup
- Significant GPS/speed detection delays
- Recorded times do not match actual performance
Requested features
4 requests- Add 60ft and 1/8 mile times
- Automatic start/stop of timer
- Manual start option for timer
- Improved accuracy and consistency
Cartomizer
Reported bugs
2 issues- Requires paid unlock to add custom wheels
- Paid unlock only allows one custom wheel upload
Requested features
4 requests- Add more wheel options
- Allow changing car color
- Improve depth perception of wheels
- Save custom wheel selections
In-app purchases
GPS Race Timer
- PRO$4.99
Cartomizer
- Add one wheel$0.99
Questions
Is GPS Race Timer free?
Is Cartomizer free?
Which has better reviews, GPS Race Timer or Cartomizer?
Do GPS Race Timer or Cartomizer have ads?
Which is updated more often, GPS Race Timer or Cartomizer?
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