# b4-app: AI Batting Partner — EV, LA, and Biomechanics > AI-powered baseball batting analysis and performance tracking. (iPhone/iPad app by KeepTossingLab.) - Source: https://appshunter.io/ios/app/b4-app-ai-batting-partner/id1612791859 (this page in markdown: same URL + `.md`) - Developer: [KeepTossingLab](https://appshunter.io/developer/1538261019) - Category: Sports, Health & Fitness - Price: Free with in-app purchases - Rating: 4.30/5 from 158 App Store ratings · 62 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 322 MB - Languages: American English, Chinese (Traditional, Taiwan) - Released: 2023-11-02 - Data updated: 2026-08-25 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/b4-app-ai-batting-partner/id1612791859/reviews.md ## What is b4? Revolutionize your baseball training experience. Enhance your batting skills, analyze your performance, and take your game to the next level. Get cutting-edge batting stats, biomechanics analysis, and real-time feedback—all with just an iPhone and a tripod! Developed with multiple Major League players. Key Features • Comprehensive Metrics: Access a complete baseball swing analysis toolset, including exit velocity, launch angle, bat path, and biomechanics analysis, to refine your skills and elevate your game. • Bat Contact Point (BCP): Precisely tracks where the bat hits the ball, giving players actionable insights on every swing. • Real-Time Playback: Review and learn from past performances with slow-motion videos, and track your progress with real-time analytics. • Immersive Pitch: An innovative feature that simulates live incoming pitches, refining your timing and reaction down to the millisecond—all from your iPhone. • Dynamic Visualizations: Easily track progress and identify your strengths. • AI Report: Gain deeper insight into your hitting performance. Track SwSp%, xwOBA, exit velocity, launch angle, and more. Batting Statistics Overview • Bat Contact Point Analysis: Your contact point range with minimum, maximum, and distribution to understand patterns and improve consistency session by session. • Bat Path Visualization: Gain in-depth insights into your bat control and make informed adjustments. • Exit Velocity Tracking: Accurately measure the speed of your hits to monitor your progress and aim for new personal bests. • Launch Angle Optimization: Perfect your launch angles for maximum performance and increase hitting probability. • Comprehensive Biomechanics Analysis: Refine your technique by understanding your stride, weight shift, and head movement. • Advanced AI Report: Track hit classifications, analyze SwSp%, xBA, xwOBA, ground-ball to fly-ball ratio, and more to pinpoint and boost your game performance. Subscriptions Our app is free for everyone to use! Access lab-level swing analysis at no cost. The Starter plan lets you analyze up to 30 swings per month. Upgrade anytime for more power! Starter Pass (Free) • 30 swings per month • Perfect for casual swing analysis and quick check-ins Essential • 100 swings per month • More reps, deeper insights, and faster improvement Premium • Unlimited swings per month • Built for dedicated athletes committed to real progress Choose Your Plan Essential • $39.99 / Yearly — Save with our annual subscription • $3.99 / Monthly — Flexible monthly subscription Premium • $149.99 / Yearly — Save with our annual subscription • $14.99 / Monthly — Flexible monthly subscription Coach Access+ • Explore enhanced plans designed specifically for coaches at all levels. Experience Future Tech Today! Dive into advanced batting metrics, enhance your sports performance in real-time, and start your science-backed journey to improvement with the b4-app – all at your fingertips. ## Key features - 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 ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium Plan | $14.99 | per month | | Premium Plan | $149.99 | per year | | Essential Plan | $3.99 | per month | | Essential Plan | $39.99 | per year | ## What do users think of b4? Overall sentiment: positive **Pros** - ✅ 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 - 📱 User-friendly interface and quick setup - 🎬 Swing path visualization and video comparison features - 💪 Helps track progress over time and maintain motivation - 🏆 Clutch mode for pressure situation training - 🤝 Responsive developer support and customer service - 💰 Good value for serious players and coaches **Cons** - 🐛 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 - 💸 Premium subscription required for full features - 📱 Incompatible with older iPhone models - ⏱️ Lengthy setup process despite claims of quick setup - 🚫 App crashes and stops working without explanation - 😞 Poor customer support response times **Commonly 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 - App crashes and becomes unresponsive - Inconsistent accuracy across different users and conditions **Most 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 ## Recent user reviews (10 of 62) All indexed reviews: https://appshunter.io/ios/app/b4-app-ai-batting-partner/id1612791859/reviews.md ### 5/5 — My Favorite Batting App! *2026-02-08* Hands down my favorite batting app! The clutch mode is an absolute game-changer—perfect for simulating pressure situations. I love how responsive and realistic it feels. This app is a must-have. Highly recọmmend for players looking to level up their game! ### 5/5 — Accurate EV Insights for Batting Practice *2026-02-07* I love how this app gives accurate Exit Velocity data right away. It's easy to use and adds real depth to my training. It makes it easy to identify weaknesses and track progress. ### 4/5 — Game-Changing Training Tool! *2026-02-06* Fantastic! It accurately tracks EV readings and helps me analyze my swing like never before. It feels like having a real coach in my pocket! ### 5/5 — Fun and Easy AI Batting Practice *2026-02-04* Great for kids! It's simple to use and fun. Very engaging for young players. Highly recọmmended! ### 4/5 — Great app *2025-08-30* This app works really well, but every few times I swing it just gives me no reading even though it gave me readings before, also I would love to see how far I hit the ball in feet. Overall good app but could use some changes. **Developer response:** Hi Danny1846, thanks so much for your feedback! Regarding the occasional swings with no reading, feel free to DM us on Instagram (@b4.app) or email us at support@b4-app.com. We’d be happy to help. Also, great idea on showing distance! That’s already on our roadmap, and we’re excited to bring it to a future update so you can see how far your hits travel. ### 5/5 — Great tool for biomechanics! *2025-07-16* I began to use this app for my son and for some players I regularly train in private lessons (8-10yrs). At their age they may understand the concepts of how their body should move for an efficient swing, but they also may not be able to feel or tell the difference when they hit the ball with a bad swing or a good swing. They may just think “I hit it hard” even though they casted their hands out and came around the ball for example. So this tool is great as it gives real time feedback and showcases the difference between a “bad habit” swing vs a good swing we are training on. As a coach, I recommend. ### 1/5 — Sheldon *2025-07-10, version 2.5.10* Really I had to pay you could have gotten 5 stars but I had to pay so you get a 1 star ### 5/5 — Great tool! *2025-07-05* Trying out this app I saw Coach Murph used in one of his videos. This is an excellent tool for coaches and players for a great visual for swing analysis. I like to utilize video to break down a swing and this app takes it to the next level with the great features including exit velocity, launch angle, and bat path tracing. Love this. I only needed things I already had around the house. A phone and a tripod. Love b4! ### 2/5 — Try free sample first *2025-06-23, version 2.5.10* Nice user interface. Not accurate. Velo metrics are off by roughly +\- 15% ### 5/5 — Swing Progress Tracker *2025-06-23, version 2.5.10* Been using it for 3 months and love cọmparing early swings to recent ones. Helps my kid stay motivated and focused. ## Frequently asked questions about b4 ### What does the b4-app do? This app revolutionizes baseball training by providing advanced AI-powered batting analysis. It helps users enhance their skills, analyze performance metrics like exit velocity and launch angle, and understand their biomechanics for improved results. ### What are the key features of this batting app? Key features include comprehensive swing analysis with metrics like exit velocity, launch angle, and bat path. It also offers bat contact point tracking, real-time playback with slow-motion video, an immersive pitch simulation, and detailed AI reports on hitting performance. ### How much does the b4-app cost? The app offers a free Starter Pass allowing up to 30 swings per month. For more extensive analysis, users can upgrade to 'Essential' (100 swings/month) or 'Premium' (unlimited swings/month) plans, available through monthly or yearly subscriptions. ### What kind of data does the AI report provide? The AI report offers deep insights into hitting performance, tracking metrics such as SwSp%, xwOBA, exit velocity, launch angle, and ground-ball to fly-ball ratio. It also analyzes hit classifications and provides a comprehensive biomechanics overview. ### Who is the target audience for this app? This app is designed for baseball players of all skill levels, from casual players to dedicated athletes, who want to improve their batting technique and performance through detailed statistical and biomechanical analysis. ## Version history (last 5 releases) ### 2.10.0 — 2026-07-09 Introducing Bat Contact Point (BCP): Pinpoint the exact location of bat-ball contact to discover your sweet spot, track consistency, and train smarter. ### 2.8.0 — 2026-04-09 Introducing Bat Contact Point (BCP): Pinpoint the exact location of bat-ball contact to discover your sweet spot, track consistency, and train smarter. ### 2.7.8 — 2026-03-10 Introducing Bat Contact Point (BCP): Pinpoint the exact location of bat-ball contact to discover your sweet spot, track consistency, and train smarter. ### 2.7.7 — 2026-02-02 Introducing Bat Contact Point (BCP): Pinpoint the exact location of bat-ball contact to discover your sweet spot, track consistency, and train smarter. ### 2.7.6 — 2026-01-25 Introducing Bat Contact Point (BCP): Pinpoint the exact location of bat-ball contact to discover your sweet spot, track consistency, and train smarter. ## Apps similar to b4 | App | Rating | Price | Category | | --- | --- | --- | --- | | [WIN Reality: SwingAI+SmartPark](https://appshunter.io/ios/app/win-reality-swingai-plus-smartpark/id1600148173) | 4.0 (120) | Free | Sports | | [BallparkDJ Walkout Intros](https://appshunter.io/ios/app/ballparkdj-walkout-intros/id821956884) | 4.8 (24,923) | Free | Sports | | [Blast Baseball](https://appshunter.io/ios/app/blast-baseball/id696974849) | 2.9 (280) | Free | Sports | | [Diamond Kinetics](https://appshunter.io/ios/app/diamond-kinetics/id1604464179) | 3.4 (151) | Free | Sports | | [The Futures App](https://appshunter.io/ios/app/the-futures-app/id1631207758) | 4.0 (54) | Free | Sports | | [Arm Care](https://appshunter.io/ios/app/arm-care/id1480260823) | 4.9 (2,971) | Free | Sports | ## Related topics [exit velocity](https://appshunter.io/ios/topics/exit-velocity) · [batting](https://appshunter.io/ios/topics/batting) · [batting practice](https://appshunter.io/ios/topics/batting-practice) · [batting ai](https://appshunter.io/ios/topics/batting-ai) · [baseball exit velocity](https://appshunter.io/ios/topics/baseball-exit-velocity) · [motusbatting](https://appshunter.io/ios/topics/motusbatting) · [baseball analytics ai](https://appshunter.io/ios/topics/baseball-analytics-ai) · [baseball swing analyzer](https://appshunter.io/ios/topics/baseball-swing-analyzer) · [baseball training](https://appshunter.io/ios/topics/baseball-training) · [free baseball swing analyzer](https://appshunter.io/ios/topics/free-baseball-swing-analyzer) · [baseball hit tracker](https://appshunter.io/ios/topics/baseball-hit-tracker) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*