TheStack Baseball vs Splitline
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TheStack Baseball
Enhance your baseball performance by increasing bat speed through dynamic, personalized training programs. Track your progress, connect with other players and coaches, and optimize your workouts for maximum gains. Requires a Stack Bat to begin.
- Dynamic training programs
- Personalized speed trainer
- Track speed and metrics
- Connect with other players
- Team monitoring for coaches
- Variable inertia speed training
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Biohack your Bat Speed so that you can swing faster & play better. From the team that brought you the Award-Winning Stack System loved by over 45,000 golfers, Dr. Sasho MacKenzie has now applied his years of speed research to create the most effective way to increase your bat speed. Players, Coaches, and Organizations across all levels of baseball can now systematically gain bat speed to hit the ball harder, farther, and have more success at the plate. What’s Inside TheStack Baseball App: * Dynamic Training Programs Customized variable inertia speed training (precision overload and overspeed) - the most efficient way to increase your bat speed. The App responds to your progress and continuously optimizes your training. The algorithms that power dynamic programming come from years of research by leading sports scientist, Dr. Sasho MacKenzie and insights from over 25 million swings from The Stack System golf’s solution. * Your Own Personal Speed Trainer Be guided through scheduled workouts while tracking Stack weight, rest, recovery, and performance gains. This information allows future workouts to be adjusted behind the scenes, so your training is optimized to maximize bat speed gains. * Track Speed, Share Metrics Seamless connection to the Stack Sensor, which is integrated into the TheStack Bat. Train anywhere, anytime. Track key performance metrics such as Stack Speed, Distance Potential, Bat Speed and Grit Score. Easily share your progress and gains. * Connect to Others Easily connect and follow other Stackers' progress and keep each other on track with your training. If you’re a Coach, add your whole team and monitor progress. *** To start speed training, you will need a Stack Bat. Terms of Use: http://www.apple.com/legal/itunes/appstore/dev/stdeula
Splitline
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Splitline is a clean, sequence-driven workout split tracker built for consistent training. Instead of locking your program to fixed weekdays, Splitline treats your split as a living rotation. If you take an unexpected rest day, skip a session, or choose a different workout, the sequence adjusts logically so your plan still makes sense tomorrow. Open the app and you immediately know what today is: - today's split - whether it is a workout or rest day - your current streak - the next few days in the line Splitline is designed to feel calm, motivating, and easy to trust. Why Splitline feels different - Rotating split logic that follows your actual training, not a rigid calendar - Simple daily completion flow with room for rest days, skips, and workout overrides - Elegant streak milestones that reward consistency without noisy gamification - Clear progress view with current streak, longest streak, completed workouts, and momentum markers - Local on-device persistence with SwiftData for fast, private, dependable tracking - Minimal program editor for renaming, reordering, and resetting your split Whether you train on a push-pull-legs variation, a custom bodybuilding split, or a repeating strength routine, Splitline helps you stay consistent without overthinking the calendar.
Screenshots
Verdict
The clearest difference is iOS requirement: TheStack Baseball at 15.0 against Splitline's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
TheStack Baseball ships an update every 2 months, Splitline every 3 months. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.
| Parameter | TheStack Baseball | Splitline |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (90 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 90 — better | — |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 121 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | The Stack System Baseball GP, Inc. | David Buhauer |
In-app purchases
TheStack Baseball
No in-app purchases
Splitline
No in-app purchases









