GPS Race Timer vs Flash Tree
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
Flash Tree
Synchronize countdown timers across multiple devices for group races or events. Start races instantly without needing external assistance. Ideal for competitive activities where precise timing is crucial.
- Synced countdown timers
- Group race functionality
- Start races instantly
- Multi-device synchronization
- Customizable countdowns
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Flash Tree is like having a synced countdown in your pocket. No more having to ask someone to start a race. Just select your preferred countdown, hit start, and GO! You can sync multiple devices to the same countdown for a group race. Flash Tree has 2 payment options Free: You can join any race invited by others for free Paid: The app asks for $1.99/month subscription to start race and invite others. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Flash Tree at 100% against GPS Race Timer's 34%. Flash Tree also leads on ads (none vs shown) and update cadence (every 10 days vs every 7 months). GPS Race Timer's advantage is rating (4.5 vs 4.0) and ratings volume (2.7K vs 4). On price, in-app purchases, monetization model 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
Both are free to download. GPS Race Timer sells 1 one-off in-app purchase and Flash Tree sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
GPS Race Timer holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: GPS Race Timer has 2.7K ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 34% of GPS Race Timer's written reviews are positive against 100% of Flash Tree's, so the app with the better star average is not the one people write more warmly about.
GPS Race Timer ships an update every 7 months, Flash Tree every 10 days. The most recent releases landed on October 11, 2026 and September 26, 2026 respectively.
| Parameter | GPS Race Timer | Flash Tree |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2.7K ratings) — better | 4.0 (4 ratings) |
| Positive reviews | 34.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 2.7K — better | 4 |
| Update frequency | Every 7 months | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.2 | 11.0 — better |
| Further details — not scored | ||
| Size | 50 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Hagenau | BUILDMYPAGE, LLC |
Customer experience
GPS Race Timer
Flash Tree
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
Flash Tree
Not enough reviews yet to summarise bugs or requests.
In-app purchases
GPS Race Timer
- PRO$4.99
Flash Tree
- Flash Tree Subscription$9.991 Month
