# b4 vs iD Evolution

The clearest difference is in-app purchases: iD Evolution at none against b4's 4. iD Evolution also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.0). b4's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 2 months). On price there is nothing between them.

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

b4 ships an update every 3 weeks, iD Evolution every 2 months. The most recent releases landed on September 24, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | b4 | iD Evolution |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (151 ratings)](https://appshunter.io/ios/app/b4-app-ai-batting-partner/id1612791859/reviews)** | — |
| Number of ratings | **151** | — |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Freemium | — |
| Size | 311 MB | 41 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [KeepTossingLab](https://appshunter.io/developer/1538261019) | [StatStak, Inc](https://appshunter.io/developer/1546259036) |

## 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


### iD Evolution

[App page](https://appshunter.io/ios/app/id-evolution/id6449439826)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is b4 free?

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

### Is iD Evolution free?

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

### Do b4 or iD Evolution have ads?

iD Evolution shows ads; b4 does not.

### Which is updated more often, b4 or iD Evolution?

b4 ships an update every 3 weeks, and iD Evolution every 2 months. Most recently, b4 was updated on September 24, 2026 and iD Evolution on September 26, 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.*