Comparison

GPS Race Timer vs Density Converter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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

About

Density Converter

Features
Read full description

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

GPS Race Timer4 screens
Density Converter2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
GPS Race Timer versus Density Converter: the parameters behind the verdict, then further details
ParameterGPS Race TimerDensity Converter
PriceFree — better$1.99
Rating4.5 (2.7K ratings) — better—
Positive reviews34.4% of reviews—
Number of ratings2.7K — better—
Update frequencyEvery 7 months — betterEvery 38 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.2 — better13.4
Further details — not scored
Size50 MB0 MB
Age rating4+4+
DeveloperThomas HagenauAnna 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

1 purchases

GPS Race Timer

One-time1
  • PRO$4.99
None

Density Converter

No in-app purchases

Questions

Is GPS Race Timer free?
GPS Race Timer is free to download, with in-app purchases available.
Is Density Converter free?
Density Converter costs $1.99, with no in-app purchases.
Do GPS Race Timer or Density Converter have ads?
GPS Race Timer shows ads; Density Converter does not.
Which is updated more often, GPS Race Timer or Density Converter?
GPS Race Timer ships an update every 7 months, and Density Converter every 38 months. Most recently, GPS Race Timer was updated on October 17, 2026 and Density Converter on October 4, 2026.

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