TheStack Baseball vs OPP Training
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
OPP Training
Log your workouts, view upcoming sessions, and book appointments. Track your progress and maximize your training sessions with this comprehensive fitness companion.
- Log workouts
- View logged workouts
- See upcoming scheduled workouts
- Book appointments
- Track progress
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Log your OPP workouts from anywhere with the OPP workout logging app! View your logged workouts, see upcoming scheduled workouts, and book appointments inside the app. Track your progress and get the most out of your OPP workouts! If you enjoy the OPP app, we’d really appreciate if you took a second to leave a nice review because it helps us improve and also helps get the word out. Thank you!!
Screenshots
Verdict
The clearest difference is ads: OPP Training at none against TheStack Baseball's shown. OPP Training also leads on monetization model (free vs ad-supported). TheStack Baseball's advantage is update cadence (every 2 months vs every 24 months) and ratings volume (53 vs 5). On price, rating, in-app purchases and device support 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.
On the App Store both sit at effectively the same score — 4.9 for TheStack Baseball against 5.0 for OPP Training. That said, the two scores are not equally well evidenced: TheStack Baseball has 53 ratings behind it against 5, so its average is the more settled of the two.
TheStack Baseball ships an update every 2 months, OPP Training every 24 months. The most recent releases landed on October 3, 2026 and October 4, 2026 respectively.
| Parameter | TheStack Baseball | OPP Training |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (53 ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 53 — better | 5 |
| Update frequency | Every 2 months — better | Every 24 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 121 MB | 49 MB |
| Age rating | 4+ | 12+ |
| Developer | The Stack System Baseball GP, Inc. | Andres Arroyo |
Customer experience
TheStack Baseball
OPP Training
In-app purchases
TheStack Baseball
No in-app purchases
OPP Training
No in-app purchases
Questions
Is TheStack Baseball free?
Is OPP Training free?
Which has better reviews, TheStack Baseball or OPP Training?
Do TheStack Baseball or OPP Training have ads?
Which is updated more often, TheStack Baseball or OPP Training?
Other comparisons
