# Proteus Motion vs TheStack Baseball

The clearest difference is rating: TheStack Baseball at 4.9 against Proteus Motion's 3.0. TheStack Baseball also leads on update cadence (every 2 months vs every 6 months) and ratings volume (53 vs 2). Proteus Motion's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, review sentiment, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

TheStack Baseball holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: TheStack Baseball has 53 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

Proteus Motion ships an update every 6 months, TheStack Baseball every 2 months. The most recent releases landed on September 10, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Proteus Motion | TheStack Baseball |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/proteus-motion/id1540100362/reviews) | **[4.9 (53 ratings)](https://appshunter.io/ios/app/thestack-baseball/id6477413655/reviews)** |
| Number of ratings | 2 | **53** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Size | 38 MB | 121 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Proteus Motion Inc.](https://appshunter.io/developer/1540100364) | [The Stack System Baseball GP, Inc.](https://appshunter.io/developer/1729294195) |

## What reviewers say

### Proteus Motion

[App page](https://appshunter.io/ios/app/proteus-motion/id1540100362)

This app provides advanced performance training and recovery analytics. It enables low-impact, high-efficiency 3D resistance training. A Proteus System user account is required to use the app.

**Highlights:** Performance training analytics, Recovery analytics, 3D resistance training, High efficiency training, Low-impact training

**Features:** macOS Compatibility

**In-app purchases:** none


### TheStack Baseball

[App page](https://appshunter.io/ios/app/thestack-baseball/id6477413655)

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.

**Highlights:** Dynamic training programs, Personalized speed trainer, Track speed and metrics, Connect with other players, Team monitoring for coaches, Variable inertia speed training

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Proteus Motion free?

Proteus Motion is free to download, with no in-app purchases.

### Is TheStack Baseball free?

TheStack Baseball is free to download, with no in-app purchases.

### Which has better reviews, Proteus Motion or TheStack Baseball?

TheStack Baseball is rated higher. Proteus Motion averages 3.0 out of 5 from 2 ratings, while TheStack Baseball averages 4.9 from 53 ratings.

### Do Proteus Motion or TheStack Baseball have ads?

TheStack Baseball shows ads; Proteus Motion does not.

### Which is updated more often, Proteus Motion or TheStack Baseball?

Proteus Motion ships an update every 6 months, and TheStack Baseball every 2 months. Most recently, Proteus Motion was updated on September 10, 2026 and TheStack Baseball on September 16, 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.*