# BACDoor™ vs GPS Race Timer

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.

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.

## The numbers

| Metric | BACDoor™ | GPS Race Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (6 ratings)](https://appshunter.io/ios/app/bacdoor/id1229140415/reviews) | **[4.5 (2.7K ratings)](https://appshunter.io/ios/app/gps-race-timer/id1340496243/reviews)** |
| Number of ratings | 6 | **2.7K** |
| Positive reviews | — | 34.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 92 MB | 50 MB |
| Requires iOS | **8.0** | 12.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Accelerated Systems Inc.](https://appshunter.io/developer/1229140414) | [Thomas Hagenau](https://appshunter.io/developer/1340496242) |

## What reviewers say

### BACDoor™

[App page](https://appshunter.io/ios/app/bacdoor/id1229140415)

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.

**Highlights:** Poll and adjust controller parameters, Upload and save parameter files, Bootload firmware to controllers, Datalog parameters, Customizable app layouts

**Features:** macOS Compatibility

**In-app purchases:** none


### GPS Race Timer

[App page](https://appshunter.io/ios/app/gps-race-timer/id1340496243)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO | $4.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Accurate speed tracking
- 💡 Customizable settings
- 📊 Saves run data

**What reviewers complain about**

- 🐛 Inconsistent 0-60 and quarter mile times
- 🐛 Fails to start/record runs
- 🐛 Inaccurate distance tracking
- 🐛 Compatibility issues with newer devices

**Reported bugs**

- Timer doesn't reset properly
- App crashes on startup
- Significant GPS/speed detection delays
- Recorded times do not match actual performance

**Requested features**

- Add 60ft and 1/8 mile times
- Automatic start/stop of timer
- Manual start option for timer
- Improved accuracy and consistency


## Frequently asked questions

### Is BACDoor™ free?

BACDoor™ is free to download, with no in-app purchases.

### Is GPS Race Timer free?

GPS Race Timer is free to download, with in-app purchases available.

### Which has better reviews, BACDoor™ or GPS Race Timer?

GPS Race Timer is rated higher. BACDoor™ averages 3.5 out of 5 from 6 ratings, while GPS Race Timer averages 4.5 from 2.7K ratings.

### Do BACDoor™ or GPS Race Timer have ads?

GPS Race Timer shows ads; BACDoor™ does not.

### Which is updated more often, BACDoor™ or GPS Race Timer?

BACDoor™ ships an update every 4 months, and GPS Race Timer every 7 months. Most recently, BACDoor™ was updated on October 6, 2026 and GPS Race Timer on October 17, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*