GPS Race Timer vs Density Converter
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
Density Converter
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Density Converter is the fast density converter to convert for Pound/cubic foot (lb/cu ft), Pound/cubic inch (lb/cu in), Pound/gallon (lb/US gal), Kilogram/cubic meter (kg/cu m), Gram/cubic centimeter (g/cu cm), Gram/cubic millimeter (g/cu mm). You can use it if you builder, scientific or another cool man. Convert densities quickly and as you want.
Screenshots
Verdict
The clearest difference is price: GPS Race Timer at Free against Density Converter's $1.99. GPS Race Timer also leads on update cadence (every 7 months vs every 38 months). Density Converter's advantage is in-app purchases (none vs 1) and ads (none vs shown). On 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
GPS Race Timer is free to download; Density Converter costs $1.99 up front. GPS Race Timer sells 1 one-off in-app purchase. Density Converter asks for nothing beyond the download.
GPS Race Timer ships an update every 7 months, Density Converter every 38 months. The most recent releases landed on October 17, 2026 and October 4, 2026 respectively.
| Parameter | GPS Race Timer | Density Converter |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.5 (2.7K ratings) — better | — |
| Positive reviews | 34.4% of reviews | — |
| Number of ratings | 2.7K — better | — |
| Update frequency | Every 7 months — better | Every 38 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.2 — better | 13.4 |
| Further details — not scored | ||
| Size | 50 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Hagenau | Anna Filobok |
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
Density Converter
Not enough reviews yet to summarise bugs or requests.
In-app purchases
GPS Race Timer
- PRO$4.99
Density Converter
No in-app purchases
Questions
Is GPS Race Timer free?
Is Density Converter free?
Do GPS Race Timer or Density Converter have ads?
Which is updated more often, GPS Race Timer or Density Converter?
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