# NSF Certified for Sport® vs TheStack Baseball

The clearest difference is review sentiment: NSF Certified for Sport® at 58% against TheStack Baseball's 0%. NSF Certified for Sport® also leads on ads (none vs shown) and monetization model (free vs ad-supported). TheStack Baseball's advantage is rating (4.9 vs 3.7). On price, ratings volume, update cadence and in-app purchases 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 3.7. Both are backed by a comparable volume of ratings — 33 and 87 respectively. Written reviews complicate that: 58% of NSF Certified for Sport®'s written reviews are positive against 0% of TheStack Baseball's, so the app with the better star average is not the one people write more warmly about.

NSF Certified for Sport® ships an update every 3 months, TheStack Baseball every 2 months. The most recent releases landed on October 11, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | NSF Certified for Sport® | TheStack Baseball |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (33 ratings)](https://appshunter.io/ios/app/nsf-certified-for-sport/id489806362/reviews) | **[4.9 (87 ratings)](https://appshunter.io/ios/app/thestack-baseball/id6477413655/reviews)** |
| Number of ratings | 33 | **87** |
| Positive reviews | **57.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Size | 49 MB | 121 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NSF International](https://appshunter.io/developer/489806365) | [The Stack System Baseball GP, Inc.](https://appshunter.io/developer/1729294195) |

## What reviewers say

### NSF Certified for Sport®

[App page](https://appshunter.io/ios/app/nsf-certified-for-sport/id489806362)

Easily find safer sports supplements tested for banned substances and contaminants. Verify product contents against label claims and receive certification updates. Make informed decisions with advanced search and comparison tools.

**Highlights:** UPC barcode scanning, Search by supplement type, Search by goal (e.g., hydration), Side-by-side comparison, Push notifications for updates, Favorites list

**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 NSF Certified for Sport® free?

NSF Certified for Sport® 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, NSF Certified for Sport® or TheStack Baseball?

TheStack Baseball is rated higher. NSF Certified for Sport® averages 3.7 out of 5 from 33 ratings, while TheStack Baseball averages 4.9 from 87 ratings.

### Do NSF Certified for Sport® or TheStack Baseball have ads?

TheStack Baseball shows ads; NSF Certified for Sport® does not.

### Which is updated more often, NSF Certified for Sport® or TheStack Baseball?

NSF Certified for Sport® ships an update every 3 months, and TheStack Baseball every 2 months. Most recently, NSF Certified for Sport® was updated on October 11, 2026 and TheStack Baseball on October 20, 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.*