OS vs Strong Challenge
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
OS
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Download the OS-1 Gym app to easily book classes and manage your fitness experience - anytime, anywhere. Make a reservation, get added to a wait list, check your profile and membership status, and more β all from your device. Visit https://www.os1dxb.com/ to learn more.
Strong Challenge
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With the Strong Challenge App, you will have access to workout programs designed specifically to help you reach your fitness and health goals! You can follow & track your workouts, your nutrition, your lifestyle habits, measurements and resultsβall with the help of your coach. FEATURES: - Access training plans and track workouts - Follow along to exercise and workout videos - Track your meals and make better food choices - Stay on top of your daily habits - Set health and fitness goals and track progress towards your goals - Gain milestone badges for achieving new personal bests and maintaining habit streaks - Message your coach in real-time - Be part of digital communities to meet people with similar health goals and stay motivated - Track body measurements and take progress photos - Get push notification reminders for scheduled workouts and activities - Connect your Apple Watch to track workouts, steps, habits, and more right from your wrist - Connect to other wearable devices and apps like the Apple Health App, Garmin, Fitbit, MyFitnessPal, and Withings devices to track workouts, sleep, nutrition, and body stats and composition Download the app today!
Screenshots
Verdict
The clearest difference is device support: Strong Challenge at 4 against OS's 2. OS's advantage is iOS requirement (13.5 vs 15.1). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OS ships an update every 3 months, Strong Challenge every 2 months. Both last shipped on November 8, 2026.
| Parameter | OS | Strong Challenge |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 2 months β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Apple Watch β better |
| Requires iOS | 13.5 β better | 15.1 |
| Further details β not scored | ||
| Size | 14 MB | 188 MB |
| Age rating | 4+ | 4+ |
| Developer | OS ONE FITNESS LLC | Strong Pilates Global Pty Ltd |
In-app purchases
OS
No in-app purchases
Strong Challenge
No in-app purchases
Questions
Is OS free?
Is Strong Challenge free?
Do OS or Strong Challenge have ads?
Which is updated more often, OS or Strong Challenge?
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