# b4 vs REACTRA

The clearest difference is rating: REACTRA at 5.0 against b4's 4.2. REACTRA also leads on in-app purchases (none vs 4) and update cadence (weekly vs every 3 weeks). b4's advantage is ratings volume (152 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. b4 sells 4 in-app purchases, starting at $3.99 per month. REACTRA asks for nothing beyond the download.

REACTRA holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: b4 has 152 ratings behind it against 1, so its average is the more settled of the two.

b4 ships an update every 3 weeks, REACTRA weekly. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | b4 | REACTRA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (152 ratings)](https://appshunter.io/ios/app/b4-app-ai-batting-partner/id1612791859/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reactra-reaction-time-trainer/id6808385850/reviews)** |
| Number of ratings | **152** | 1 |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Freemium | **Free** |
| Size | 222 MB | 141 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [KeepTossingLab](https://appshunter.io/developer/1538261019) | [Brandon Durr](https://appshunter.io/developer/6791444539) |

## What reviewers say

### b4

[App page](https://appshunter.io/ios/app/b4-app-ai-batting-partner/id1612791859)

Enhance your baseball batting with advanced AI analysis. Track key metrics like exit velocity and launch angle, analyze biomechanics, and receive real-time feedback. Improve your swing and performance with detailed reports and video playback.

**Highlights:** Comprehensive swing analysis, Exit velocity and launch angle tracking, Bat contact point analysis, Real-time playback and analytics, Immersive pitch simulation, AI-driven performance reports

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Essential Plan | $3.99 | per month |
| Premium Plan | $14.99 | per month |
| Essential Plan | $39.99 | per year |
| Premium Plan | $149.99 | per year |

**What reviewers like**

- ✅ Accurate exit velocity readings matching professional equipment
- 📊 Real-time swing analysis and biomechanics feedback
- 🎯 Launch angle tracking is precise and reliable
- 👨‍👧‍👦 Suitable for all ages and skill levels
- 🏋️ Effective tool for identifying and fixing swing weaknesses

**What reviewers complain about**

- 🐛 Inconsistent exit velocity readings (off by ±15%)
- 🐛 Intermittent detection failures after initial readings
- ❌ Login and authentication issues preventing app access
- ⚠️ Temperature sensitivity affecting accuracy above 80°F
- 🔧 Unreliable setup requiring multiple attempts

**Reported bugs**

- Exit velocity readings fail after first swing
- Login fails repeatedly even after reinstalling app
- App stops providing readings mid-session
- Inaccurate measurements in certain temperature conditions
- Setup configuration not recognized despite proper calibration

**Requested features**

- Distance tracking in feet for hit balls
- More in-depth analytics and statistics
- Support for older iPhone models
- Enhanced data visualization and reporting


### REACTRA

[App page](https://appshunter.io/ios/app/reactra-reaction-time-trainer/id6808385850)

Engage in fast-paced visual experiments designed to test and improve your attention and reaction time. Use your hands and eyes to interact with unique challenges, compete with friends, and track your personal progress.

**Highlights:** Fast visual experiments, Camera-based gameplay, Multiplayer challenges, Daily community challenges, Personal progress tracking, Frame-by-frame playback

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is b4 free?

b4 is free to download, with in-app purchases available.

### Is REACTRA free?

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

### Which has better reviews, b4 or REACTRA?

REACTRA is rated higher. b4 averages 4.2 out of 5 from 152 ratings, while REACTRA averages 5.0 from 1 ratings.

### Do b4 or REACTRA have ads?

Neither b4 nor REACTRA shows ads.

### Which is updated more often, b4 or REACTRA?

b4 ships an update every 3 weeks, and REACTRA weekly. Most recently, b4 was updated on October 30, 2026 and REACTRA 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.*