# GPS Race Timer vs Cartomizer

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.

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.

## The numbers

| Metric | GPS Race Timer | Cartomizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2.7K ratings)](https://appshunter.io/ios/app/gps-race-timer/id1340496243/reviews) | **[4.5 (518 ratings)](https://appshunter.io/ios/app/cartomizer/id1515523302/reviews)** |
| Number of ratings | **2.7K** | 518 |
| Positive reviews | 34.7% of reviews | **86.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 50 MB | 60 MB |
| Requires iOS | **12.2** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Hagenau](https://appshunter.io/developer/1340496242) | [Ron Levy](https://appshunter.io/developer/1515448985) |

## What reviewers say

### GPS Race Timer

[App page](https://appshunter.io/ios/app/gps-race-timer/id1340496243)

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.

**Highlights:** 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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO | $4.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Accurate speed tracking
- 💡 Customizable settings
- 📊 Saves run data

**What reviewers complain about**

- 🐛 Inconsistent 0-60 and quarter mile times
- 🐛 Fails to start/record runs
- 🐛 Inaccurate distance tracking
- 🐛 Compatibility issues with newer devices

**Reported bugs**

- Timer doesn't reset properly
- App crashes on startup
- Significant GPS/speed detection delays
- Recorded times do not match actual performance

**Requested features**

- Add 60ft and 1/8 mile times
- Automatic start/stop of timer
- Manual start option for timer
- Improved accuracy and consistency


### Cartomizer

[App page](https://appshunter.io/ios/app/cartomizer/id1515523302)

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.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add one wheel | $0.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Helpful visual tool
- 💡 Useful for choosing wheels
- 👍 Realistic wheel visualization
- 👍 Excellent app

**What reviewers complain about**

- 💰 Paid to add custom wheels
- 🐛 Limited wheel selection
- 🐛 Wheels look like 2D images
- 🐛 Inconsistent quality of wheel visualization

**Reported bugs**

- Requires paid unlock to add custom wheels
- Paid unlock only allows one custom wheel upload

**Requested features**

- Add more wheel options
- Allow changing car color
- Improve depth perception of wheels
- Save custom wheel selections


## Frequently asked questions

### Is GPS Race Timer free?

GPS Race Timer is free to download, with in-app purchases available.

### Is Cartomizer free?

Cartomizer is free to download, with in-app purchases available.

### Which has better reviews, GPS Race Timer or Cartomizer?

Cartomizer is rated higher. GPS Race Timer averages 4.5 out of 5 from 2.7K ratings, while Cartomizer averages 4.5 from 518 ratings.

### Do GPS Race Timer or Cartomizer have ads?

GPS Race Timer shows ads; Cartomizer does not.

### Which is updated more often, GPS Race Timer or Cartomizer?

GPS Race Timer ships an update every 7 months, and Cartomizer every 3 months. Most recently, GPS Race Timer was updated on September 20, 2026 and Cartomizer on September 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*