# PULSE VB vs b4

The clearest difference is rating: PULSE VB at 5.0 against b4's 4.2. PULSE VB also leads on in-app purchases (none vs 4) and update cadence (every 10 days vs every 3 weeks). b4's advantage is ratings volume (152 vs 1). On price and ads there is nothing between them.

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

PULSE VB 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.

PULSE VB ships an update every 10 days, b4 every 3 weeks. The most recent releases landed on October 14, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | PULSE VB | b4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pulse-vb/id1323372632/reviews)** | [4.2 (152 ratings)](https://appshunter.io/ios/app/b4-app-ai-batting-partner/id1612791859/reviews) |
| Number of ratings | 1 | **152** |
| Positive reviews | — | 80.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Monetization | **Free** | Freemium |
| Size | 88 MB | 222 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Driveline Baseball](https://appshunter.io/developer/1513897848) | [KeepTossingLab](https://appshunter.io/developer/1538261019) |

## What reviewers say

### PULSE VB

[App page](https://appshunter.io/ios/app/pulse-vb/id1323372632)

This app monitors your volleyball training by collecting swing biomechanics data from a wrist-worn sensor. It provides daily workload targets to help build arm strength, recover faster, and manage fatigue for optimal performance on the court.

**Highlights:** Wearable sensor for swing biomechanics, Daily workload targets, Arm strength building, Faster recovery, Fatigue management, Tailored training programs

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is PULSE VB free?

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

### Is b4 free?

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

### Which has better reviews, PULSE VB or b4?

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

### Do PULSE VB or b4 have ads?

Neither PULSE VB nor b4 shows ads.

### Which is updated more often, PULSE VB or b4?

PULSE VB ships an update every 10 days, and b4 every 3 weeks. Most recently, PULSE VB was updated on October 14, 2026 and b4 on October 30, 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.*