# iTSX vs FastR

The clearest difference is rating: FastR at 4.4 against iTSX's 2.3. FastR also leads on review sentiment (38% vs 24%) and ratings volume (319 vs 45). iTSX's advantage is in-app purchases (none vs 2) and update cadence (every 2 months vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. FastR sells 2 one-off in-app purchases. iTSX asks for nothing beyond the download.

FastR holds the better App Store score, 4.4 against 2.3. That said, the two scores are not equally well evidenced: FastR has 319 ratings behind it against 45, so its average is the more settled of the two. Written reviews point the same way: 24% of iTSX's written reviews are positive against 38% of FastR's.

iTSX ships an update every 2 months, FastR every 5 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | iTSX | FastR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (45 ratings)](https://appshunter.io/ios/app/itsx/id461100848/reviews) | **[4.4 (319 ratings)](https://appshunter.io/ios/app/fastr-0-60-acceleration-test/id1296375567/reviews)** |
| Number of ratings | 45 | **319** |
| Positive reviews | 24.5% of reviews | **37.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 20 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SCT Performance](https://appshunter.io/developer/461100851) | [Erhies Fekarurhobo](https://appshunter.io/developer/1296375566) |

## What reviewers say

### iTSX

[App page](https://appshunter.io/ios/app/itsx/id461100848)

Tune and monitor your vehicle's performance using your iPhone or iPad. This app requires a specific wireless OBD-II interface to adjust engine parameters, view real-time data, and run performance tests. It also allows for reading and clearing diagnostic trouble codes.

**Highlights:** Vehicle programming for performance gains, Pre-loaded dyno-proven tunes, Adjustable speed limiter, Virtual gauges and data monitoring, Record and review data logs, Performance tests (0-60, 1/4 mile), Read and clear diagnostic trouble codes

**In-app purchases:** none


### FastR

[App page](https://appshunter.io/ios/app/fastr-0-60-acceleration-test/id1296375567)

Measure your vehicle's acceleration performance with this app. It automatically tests 0-60 and quarter-mile times with millisecond accuracy. Compete with others on a real-time leaderboard and save results for different car models.

**Highlights:** Hands-free, automated acceleration testing, 0-60 and Quarter mile time measurement, Millisecond accuracy, Real-time user ranking, Save times for different car models

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 Leaderboard Posts | $3.99 | one-time |
| Unlock 1/4 Mile Timing | $5.99 | one-time |

**What reviewers like**

- 👍 Easy to use interface and simple design
- 💡 Innovative concept for testing 0-60 times without expensive equipment
- 🏆 Competitive leaderboard feature for sharing times
- 📱 Well-designed app layout
- ✅ Accurate readings for slower vehicles (6+ second 0-60 times)

**What reviewers complain about**

- 🐛 Severe GPS lag and timing delays (1-3+ seconds behind actual speed)
- ❌ Highly inaccurate for high-performance vehicles (sub-5 second 0-60)
- 🔌 Network connection issues preventing app functionality
- 📵 Login and authentication problems (Facebook-only requirement)
- ⚠️ Inconsistent and unreliable acceleration measurements

**Reported bugs**

- Network connection errors preventing vehicle selection
- Facebook login buffering and not connecting
- App fails to record and save acceleration times
- GPS speed readings lag significantly behind actual speed
- App crashes on launch or during use

**Requested features**

- GPS-based auto-start feature instead of manual start button
- Audio cues for 'ready, set, go' countdown
- Alternative login methods beyond Facebook
- Save vehicle selection for future sessions
- Support for multiple vehicles per account


## Frequently asked questions

### Is iTSX free?

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

### Is FastR free?

FastR is free to download, with in-app purchases available.

### Which has better reviews, iTSX or FastR?

FastR is rated higher. iTSX averages 2.3 out of 5 from 45 ratings, while FastR averages 4.4 from 319 ratings.

### Do iTSX or FastR have ads?

Neither iTSX nor FastR shows ads.

### Which is updated more often, iTSX or FastR?

iTSX ships an update every 2 months, and FastR every 5 months. Most recently, iTSX was updated on October 21, 2026 and FastR on October 24, 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.*