Comparison

OnlyStrength vs Gym Boss

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

Gym Boss

This app serves as a flexible training notebook to plan and track your workouts, including sets, cardio, nutrition, and progress. It offers an AI coach that learns from your training history to provide personalized recommendations and insights.

Highlights
  • Custom workout planning
  • Train Mode for execution
  • Track sets, cardio, nutrition
  • AI coach with workout context
  • Next-workout recommendations
  • Strength progress by muscle group
  • Food logging and barcode scanning
Features
Read full description

Gym Boss is the training notebook that learns how you train. Plan workouts your way with flexible notes, then use Train Mode when it’s time to lift. Track sets, cardio, nutrition, bodyweight, and progress without forcing your routine into someone else’s template. As your training history grows, Gym Boss can help you understand it, recommend what to do next, and give you an AI coach that already knows the context behind your workouts. WORKOUTS THAT FIT YOU Create completely custom workout notes Choose from built-in training splits or start blank Use Train Mode to execute your workout Track workout duration and exercise history See next-workout recommendations based on your training ASK GYM BOSS AI Ask questions about your workouts, progression, nutrition, and training. Gym Boss can use your recent history and workout context so you don’t have to explain everything from scratch. TRACK MORE THAN LIFTS Log food naturally and estimate calories and macros Scan food barcodes Track outdoor and indoor cardio Log bodyweight and view your history Explore strength progress by muscle group Review weekly and monthly recaps GYM BOSS PREMIUM Premium turns your training history into deeper guidance with expanded AI coaching, personalized training intelligence, advanced insights, and additional Premium features. The core tracking tools stay useful without Premium. Gym Boss is built so the data you log belongs to your training experience, not a paywall. Privacy Policy: https://gymbossnotes.com/#privacy Terms of Use: https://gymbossnotes.com/#terms

Screenshots

OnlyStrength4 screens
Gym Boss4 screens

Verdict

The call

The clearest difference is review sentiment: Gym Boss at 100% against OnlyStrength's 83%. Gym Boss also leads on rating (5.0 vs 4.8) and update cadence (every 3 days vs weekly). OnlyStrength's advantage is ratings volume (27 vs 4). On price, ads, in-app purchases and monetization model 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 and Gym Boss sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Gym Boss holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: OnlyStrength has 27 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 83% of OnlyStrength's written reviews are positive against 100% of Gym Boss's.

UpkeepUpdate frequency

OnlyStrength ships an update weekly, Gym Boss every 3 days. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

Scorecard4 real differences · 6 level
OnlyStrength versus Gym Boss: the parameters behind the verdict, then further details
ParameterOnlyStrengthGym Boss
PriceFreeFree
Rating4.8 (27 ratings)5.0 (4 ratings) — better
Positive reviews83.3% of reviews100.0% of reviews — better
Number of ratings27 — better4
Update frequencyWeeklyEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.015.1 — better
Further details — not scored
Size76 MB70 MB
Age rating12+17+
DeveloperChallenger Training Systems IncMaddox Borden

Customer experience

OnlyStrength

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

Gym Boss

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 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
2 purchases

Gym Boss

Subscriptions2
  • Gym Boss: Premium$5.991 Month
  • Gym Boss: Premium Annually$59.991 Year

Questions

Is OnlyStrength free?
OnlyStrength is free to download, with in-app purchases available.
Is Gym Boss free?
Gym Boss is free to download, with in-app purchases available.
Which has better reviews, OnlyStrength or Gym Boss?
Gym Boss is rated higher. OnlyStrength averages 4.8 out of 5 from 27 ratings, while Gym Boss averages 5.0 from 4 ratings.
Do OnlyStrength or Gym Boss have ads?
Neither OnlyStrength nor Gym Boss shows ads.
Which is updated more often, OnlyStrength or Gym Boss?
OnlyStrength ships an update weekly, and Gym Boss every 3 days. Most recently, OnlyStrength was updated on October 24, 2026 and Gym Boss on October 16, 2026.

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