Comparison

OnlyStrength vs CSP Amplify

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

Head to head
About

OnlyStrength

This app offers comprehensive strength training and athletic performance programs designed by expert coaches. It provides guided workouts with detailed exercise instructions, progress tracking, and automatic weight calculations to help athletes improve speed, strength, and explosiveness.

Highlights
  • Progressed and guided programming
  • Detailed exercise instructions with video demos
  • Automatic weight calculations
  • Workout history tracking
  • Metric tracking for sprint times and jump scores
  • In-app rest timer
  • Community for expert guidance
Features
Read full description

Try OnlyStrength COMPLETELY FREE with our 7 Day FREE Trial. Risk free, no payment collected during your trial! OnlyStrength is the BEST Remote Training Experience in the WORLD for Athletes of ALL SPORTS! - Programming trusted by THOUSANDS of athletes since 2016. - Designed by expert and world renowned Coach, Gerry DeFilippo. - Has guided collegiate and pro athletes from over 75 organizations and colleges. - Highly regarded by various MLB, NFL and Collegiate Performance Coaches. OnlyStength gives athletes and members year round programming COMPREHENSIVELY involving all aspects of strength training, sprinting, plyometrics, agility, mobility, conditioning and more. It is designed for athletes who want to improve their performance and athletic ability, but have no idea where to begin or start. Our system provides progressed, guided programming giving all athletes the tools they need to get faster, stronger and more explosive. Designed for athletes who need a specific program driven to improve athletic performance. Choose your program based upon your experience level or whether or not you are in-season or moving through your off-season. With OnlyStrength, you can expect: - Progressed and guided programming. - Prescribed reps, sets, rest and tempo/intensity for all exercises. - Comprehensive sprinting, agility and top speed/acceleration training. - A battery of loaded and unloaded jumps and plyometrics to build power. - Complete upper and lower body strength training to build strength and force output. - Conditioning, mobility and preparation/warm-up routines. The OnlyStrength app is designed to assist you via: - Automatic weight calculations for main lifts and strength movements. - Workout history tracking gathering and collecting all weights used for easy reference. - Video demos for EVERY exercise directly and easily accessible within all training programs. - Metric tracking for sprint times, jump scores, bodyweight and more to gauge YOUR progress. - In-app rest timer set specifically to the rest times you need depending on each exercise type. - Categorized video library of over 700 strength, speed, jump, mobility and conditioning demos to guide you. - Community where you can seek guidance and receive help from expert coach Gerry DeFilippo. Coming soon: - Special coach packages where coaches can distribute OnlyStrength programming to their teams with personalized profiles. - Artificial Intelligence technology based on and crafted after Gerry DeFilippo, at your full disposal to answer your training questions and design further personalized and custom programs for YOU! Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://getonlystrength.training/privacy-policy

About

CSP Amplify

Access expert-designed exercises and personalized training programs trusted by professional athletes. Features hundreds of professionally filmed demonstrations, clear technique instructions, and progress tracking to help you maximize your performance. Optimized for serious athletes and fitness enthusiasts.

Highlights
  • Expert exercise library with hundreds of demonstrations
  • Personalized training recommendations
  • Progress tracking and workout history
  • Curated workout programs
  • Offline video playback
  • Dark mode support
Features
Read full description

CRESSEY SPORTS PERFORMANCE - ELITE TRAINING, ANYWHERE Transform your training with the official Cressey Sports Performance mobile app. Get instant access to the same expert-designed exercises and programs trusted by professional athletes, collegiate teams, and serious fitness enthusiasts worldwide. WHAT YOU'LL GET EXPERT EXERCISE LIBRARY Hundreds of professionally filmed exercise demonstrations Clear technique instructions and coaching cues Categorized by movement patterns, equipment, and training goals High-quality video playback with detailed form breakdowns PERSONALIZED TRAINING Smart exercise recommendations based on your experience level Customized workout collections for your specific goals Progress tracking to monitor your training journey Favorite and bookmark exercises for quick access ORGANIZED COLLECTIONS Curated workout programs for different training phases Exercise progressions and regressions Sport-specific training protocols Injury prevention and corrective exercise sequences TRAINING NOTES & HISTORY Add personal notes to any exercise Track your exercise history and frequency Review past workouts and training sessions Build your personalized exercise database WORLD-CLASS EXPERTISE Access proven training methods from Eric Cressey and the CSP coaching team — the same professionals who have worked with: MLB All-Stars and World Series Champions NFL Pro Bowlers and Super Bowl Champions Olympic athletes and elite performers Thousands of dedicated athletes at all levels SEAMLESS EXPERIENCE Smooth, intuitive interface designed for athletes Offline-capable video playback Background audio support for music while training Full-screen video mode for detailed viewing Dark mode optimized for gym environments POWERFUL FEATURES Advanced filtering and search capabilities Multiple category organization Equipment-based exercise sorting Regular content updates with new exercises Cloud sync across all your devices WHO IT'S FOR Serious athletes looking to maximize performance Strength and conditioning professionals Personal trainers seeking expert exercise demonstrations Fitness enthusiasts committed to proper technique Anyone wanting access to world-class training methods ABOUT CRESSEY SPORTS PERFORMANCE CSP has been at the forefront of sports performance training for over two decades. Our evidence-based approach combines cutting-edge research with real-world application, helping thousands of athletes achieve their goals safely and effectively. Founded by renowned performance coach Eric Cressey, CSP has become the go-to resource for athletes who refuse to settle for average. Our training methods are backed by science, proven by results, and now available in the palm of your hand. SUBSCRIPTION REQUIRED This app requires an active CSP subscription to access content. Visit ericcressey.com to learn more about membership options and start your journey to peak performance. SUPPORT Questions or feedback? Our team is here to help: Email: support@ericcressey.com Website: www.ericcressey.com Train smarter. Perform better. Download the CSP app today.

Screenshots

OnlyStrength3 screens
CSP Amplify4 screens

Verdict

The call

The clearest difference is in-app purchases: CSP Amplify at none against OnlyStrength's 2. CSP Amplify also leads on review sentiment (100% vs 83%) and rating (5.0 vs 4.8). OnlyStrength's advantage is update cadence (every 10 days vs monthly). On price, ratings volume, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OnlyStrength sells 2 in-app purchases, starting at $34.99 per month. CSP Amplify asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

CSP Amplify holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 27 and 14 respectively. Written reviews point the same way: 83% of OnlyStrength's written reviews are positive against 100% of CSP Amplify's.

UpkeepUpdate frequency

OnlyStrength ships an update every 10 days, CSP Amplify monthly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

Scorecard6 real differences · 4 level
OnlyStrength versus CSP Amplify: the parameters behind the verdict, then further details
ParameterOnlyStrengthCSP Amplify
PriceFreeFree
Rating4.8 (27 ratings)5.0 (14 ratings) — better
Positive reviews83.3% of reviews100.0% of reviews — better
Number of ratings27 — better14
Update frequencyEvery 10 days — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterSubscription
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.013.0 — better
Further details — not scored
Size76 MB62 MB
Age rating12+4+
DeveloperChallenger Training Systems IncCressey Training Systems, LLC

Customer experience

OnlyStrength

All ratings27 ratings
Positive92.6%
Neutral3.7%
Negative3.7%
Written reviews12 reviews
Positive83.3%
Neutral8.3%
Negative8.3%

CSP Amplify

Written reviews10 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

OnlyStrength

Subscriptions2
  • OnlyStrength Premium Monthly$34.991 Month
  • OnlyStrength Premium Annual$349.991 Year
None

CSP Amplify

No in-app purchases

Questions

Is OnlyStrength free?
OnlyStrength is free to download, with in-app purchases available.
Is CSP Amplify free?
CSP Amplify is free to download, with no in-app purchases.
Which has better reviews, OnlyStrength or CSP Amplify?
CSP Amplify is rated higher. OnlyStrength averages 4.8 out of 5 from 27 ratings, while CSP Amplify averages 5.0 from 14 ratings.
Do OnlyStrength or CSP Amplify have ads?
Neither OnlyStrength nor CSP Amplify shows ads.
Which is updated more often, OnlyStrength or CSP Amplify?
OnlyStrength ships an update every 10 days, and CSP Amplify monthly. Most recently, OnlyStrength was updated on October 5, 2026 and CSP Amplify on October 2, 2026.

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