Comparison

GPS Race Timer vs TDI Flasher

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

TDI Flasher

Remap your VAG TDI vehicle from home with this mobile tuning solution. Improve power and efficiency by flashing custom tunes. Requires a specific OBD adapter.

Highlights
  • Datalogging with BHP & Torque estimates
  • Read & Clear Trouble Codes
  • Remap/Flash vehicle with performance tunes
  • Check OBD Readiness Status
Features
Read full description

Revolutionising the TDI tuning market with a mobile flashing solution delivering high quality tunes in the palm of your hand. Improve the power and efficiency of your vehicle, remap your car from home with TDI Flasher. TDI Flasher OBD Adapter is required in order to flash your vehicle. Features - Datalogging (with estimated BHP & Torque values) - Read & Clear Trouble Codes - Remap/Flash your car with one of our Performance or Emissions solutions - Check OBD Readiness Status

Screenshots

GPS Race Timer4 screens
TDI Flasher4 screens

Verdict

The call

The clearest difference is rating: GPS Race Timer at 4.5 against TDI Flasher's 3.0. GPS Race Timer also leads on ratings volume (2.7K vs 2) and iOS requirement (12.2 vs 15.1). TDI Flasher's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 7 months). On price, ads and device support 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

Both are free to download. GPS Race Timer sells 1 one-off in-app purchase. TDI Flasher asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

GPS Race Timer holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: GPS Race Timer has 2.7K ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

GPS Race Timer ships an update every 7 months, TDI Flasher every 3 months. The most recent releases landed on September 25, 2026 and September 8, 2026 respectively.

Scorecard6 real differences · 4 level
GPS Race Timer versus TDI Flasher: the parameters behind the verdict, then further details
ParameterGPS Race TimerTDI Flasher
PriceFreeFree
Rating4.5 (2.7K ratings) — better3.0 (2 ratings)
Positive reviews34.7% of reviews—
Number of ratings2.7K — better2
Update frequencyEvery 7 monthsEvery 3 months — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.2 — better15.1
Further details — not scored
Size50 MB55 MB
Age rating4+17+
DeveloperThomas HagenauMobile Flash Solutions Ltd

Customer experience

GPS Race Timer

All ratings2,612 ratings
Positive87.1%
Neutral4.7%
Negative8.2%
Written reviews124 reviews
Positive34.7%
Neutral4.0%
Negative61.3%

TDI Flasher

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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

TDI Flasher

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

GPS Race Timer

One-time1
  • PRO$4.99
None

TDI Flasher

No in-app purchases

Questions

Is GPS Race Timer free?
GPS Race Timer is free to download, with in-app purchases available.
Is TDI Flasher free?
TDI Flasher is free to download, with no in-app purchases.
Which has better reviews, GPS Race Timer or TDI Flasher?
GPS Race Timer is rated higher. GPS Race Timer averages 4.5 out of 5 from 2.7K ratings, while TDI Flasher averages 3.0 from 2 ratings.
Do GPS Race Timer or TDI Flasher have ads?
Both GPS Race Timer and TDI Flasher show ads.
Which is updated more often, GPS Race Timer or TDI Flasher?
GPS Race Timer ships an update every 7 months, and TDI Flasher every 3 months. Most recently, GPS Race Timer was updated on September 25, 2026 and TDI Flasher on September 8, 2026.

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