Comparison

NSF Certified for Sport® vs TheStack Baseball

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

NSF Certified for Sport®

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
Read full description

Why Download the Certified for Sport app® NSF’s Certified for Sport® app helps you find tested, safer sports supplements in just seconds. We built our app listening to athletes, coaches and active adults who want to be certain the supplements they use are tested, certified and safer. If a product is Certified for Sport®, you can be sure it - is manufactured at a facility that is audited for quality and safety - has been tested for more than 270 athletically banned or harmful substances and unsafe levels of contaminants - and that it has been certified that the contents shown on the label are actually in the product The NSF Sport app features a clean, intuitive design with a variety of search and display features to suit your individual goals. • Advanced tasks, such as UPC barcode scanning, make it more convenient than ever to check to see if a product is Certified for Sport®. • Expanded search capabilities allow you to search by supplement type such as protein or by goal, such as hydration. • Side-by-side comparison features allow you to make smart and effective decisions about which supplements best fit your needs. Stay up to date on the sports supplements that matter to you with our push notification and favorites features. Compile lists of your preferred products or brands with one tap and get notified of important Certified for Sport® certification updates as they happen. With so many choices on the market, it pays to be cautious. If you use a product that has been Certified for Sport® you can be confident that its contents are being regularly checked by one of the most respected certifiers in the world. Do your research and look for the Certified for Sport® mark on products and download the app now!

About

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.

Highlights
  • Dynamic training programs
  • Personalized speed trainer
  • Track speed and metrics
  • Connect with other players
  • Team monitoring for coaches
  • Variable inertia speed training
Features
Read full description

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

Screenshots

NSF Certified for Sport®4 screens
TheStack Baseball4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
NSF Certified for Sport® versus TheStack Baseball: the parameters behind the verdict, then further details
ParameterNSF Certified for Sport®TheStack Baseball
PriceFreeFree
Rating3.7 (33 ratings)4.9 (87 ratings) — better
Positive reviews57.7% of reviews — better0.0% of reviews
Number of ratings3387 — better
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPodiPhone, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size49 MB121 MB
Age rating4+4+
DeveloperNSF InternationalThe Stack System Baseball GP, Inc.

Customer experience

NSF Certified for Sport®

All ratings33 ratings
Positive63.6%
Neutral3.0%
Negative33.3%
Written reviews26 reviews
Positive57.7%
Neutral7.7%
Negative34.6%

TheStack Baseball

All ratings53 ratings
Positive98.1%
Neutral1.9%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

NSF Certified for Sport®

No in-app purchases

None

TheStack Baseball

No in-app purchases

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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