BACDoor™ vs GPS Race Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BACDoor™
This utility app allows ASI customers with a support account to fine-tune Bluetooth controllers directly from their mobile device. It offers features like parameter adjustment, file management, firmware updates, and data logging without needing a PC connection.
- Poll and adjust controller parameters
- Upload and save parameter files
- Bootload firmware to controllers
- Datalog parameters
- Customizable app layouts
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ASI customers with a support account can use this app to finetune their Bluetooth controllers. No need to connect the controller harness to a PC. Features include: -Poll and adjust individual controller parameters -Upload & Save Parameter files -Bootload Firmware to Controller & Lin Peripherals -Datalog a set of Parameters -Customizable and swappable App Layouts
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
Screenshots
Verdict
The clearest difference is rating: GPS Race Timer at 4.5 against BACDoor™'s 3.5. GPS Race Timer also leads on ratings volume (2.7K vs 6). BACDoor™'s advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, update cadence 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. BACDoor™ asks for nothing beyond the download.
GPS Race Timer holds the better App Store score, 4.5 against 3.5. That said, the two scores are not equally well evidenced: GPS Race Timer has 2.7K ratings behind it against 6, so its average is the more settled of the two.
BACDoor™ ships an update every 4 months, GPS Race Timer every 7 months. The most recent releases landed on October 6, 2026 and October 17, 2026 respectively.
| Parameter | BACDoor™ | GPS Race Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (6 ratings) | 4.5 (2.7K ratings) — better |
| Positive reviews | — | 34.4% of reviews |
| Number of ratings | 6 | 2.7K — better |
| Update frequency | Every 4 months — better | Every 7 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 12.2 |
| Further details — not scored | ||
| Size | 92 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Accelerated Systems Inc. | Thomas Hagenau |
Customer experience
BACDoor™
GPS Race Timer
Bugs and requests
BACDoor™
Not enough reviews yet to summarise bugs or 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
In-app purchases
BACDoor™
No in-app purchases
GPS Race Timer
- PRO$4.99
