Muscle Mastery vs Built With Science+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Muscle Mastery
This app helps users achieve their health and fitness goals with personalized workout and nutrition plans. It offers direct access to certified coaches for support and accountability, along with tools to track progress and daily habits.
- Personalized training plans with video instruction
- Workout and progress tracking
- Nutrition and macro tracking
- Direct in-app messaging with coaches
- Habit tracking and accountability
- Integration with wearable devices
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Your program lives here. This is where the work happens. Muscle Mastery is a private coaching brand built by Jeff Later, IFBB Pro, with over 24 years of experience and 8,000+ client transformations. The method is built on four phases: Prime, Prove, Power, Polish. A system designed to change your body and what you believe is possible for it. If you're a Muscle Mastery client, this app is your home base. Your training program, your nutrition plan, your check-ins, and your coach, all in one place. No confusion about where to go or what to do next. Open the app, follow the plan, submit your check-in, and move forward. -Access your custom training program with video instruction and exercise guidance -Log your workouts including weight, sets, reps, and personal records -Submit weekly check-ins directly to your coach with photos, measurements, and notes -Reference your nutrition plan and track your daily macros -Message your coach directly through in-app messaging -Track body weight, measurements, and progress photos over time -Check daily habits set by you and your coach -Get push notifications for scheduled sessions and coach updates -Connects to Apple Watch and Apple HealthKit, Fitbit, and Withings to sync body stats This app is for Muscle Mastery clients only.
Built With Science+
This intelligent fitness companion offers personalized workout plans and nutrition advice based on scientific insights. It adapts to your progress with real-time feedback, providing guidance for continuous gains and informed health decisions.
- Hyper-Personalized Workouts
- Progressive Overload Guidance
- Real-Time Diet Adjustments
- AI-Powered Meal Scanner
- 250+ Exercise Tutorials
- Daily Knowledge Boosters
- AI Fitness & Nutrition Assistant
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Reach your goals faster with BWS+ all-in-one fitness coach. Frustrated with cookie-cutter workout plans and confusing nutrition advice? BWS+ is your intelligent coach and complete fitness companion for achieving the body you've always wanted. The app integrates insights from leading fitness scientists, coaches, and dietitians, offering personalized advice based on your unique body and goals. It evolves with you, adapting your workouts and nutrition based on real-time feedback, encapsulating decades of experience into a dynamic coach that tailors itself to your needs. The latest science, personalized to you - Hyper-Personalized Workouts: Built with Science's advanced algorithm creates a workout plan specifically for your body, goals, and schedule. Whether you're hitting the gym or training at home, we've got you covered. - Progressive Overload Guidance: Never plateau again. BWS+ tells you exactly how to adjust your weights and reps each session for continuous gains. - Real-Time Diet Adjustments: As your body changes, so do your nutritional needs. Our app adapts your meal plan weekly, ensuring you're always on track. All-in-One Fitness and Nutrition Solution - 250+ In-Depth Exercise Tutorials: Master proper form with our detailed video guides, packed with science-based insights. - AI-Powered Meal Scanner: Say goodbye to tedious calorie counting. Simply snap a photo of your meal, and our AI does the rest, accurately tracking your nutrition in seconds. - Daily Knowledge Boosters: Unlock 200+ bite-sized lessons to build your fitness IQ and make informed decisions about your health. One App is All You Need - AI Fitness & Nutrition Assistant: Get personalized answers to your fitness and nutrition questions, as if you're talking directly to Jeremy Ethier. - Muscle Group Prioritizer: Focus on specific muscles that need extra attention for balanced development. - Recomp Detector: Track simultaneous fat loss and muscle gain with our advanced body composition analysis. - Step Tracking and Daily Activity Goals: Seamlessly integrate with Apple Health and Google Fit to optimize your overall activity levels. We've combined cutting-edge technology with years of scientific research to create an app that delivers real, lasting transformations. No more guesswork, no more wasted time in the gym. BWS+ provides the structure and guidance you need to finally achieve the body you deserve. Download now and take the first step towards the best version of yourself! This app requires an active BuiltWithScience+ membership or an in-app subscription purchased through the App Store to access its features and content. Subscription details and terms are available within the app.
Screenshots
Verdict
The clearest difference is in-app purchases: Muscle Mastery at none against Built With Science+'s 4. Muscle Mastery also leads on review sentiment (100% vs 80%). Built With Science+'s advantage is ratings volume (5K vs 95) and update cadence (fortnightly vs every 2 months). On price, rating, 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
Both are free to download. Built With Science+ sells 4 in-app purchases, starting at $29.99 per month. Muscle Mastery asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Muscle Mastery against 4.8 for Built With Science+. That said, the two scores are not equally well evidenced: Built With Science+ has 5K ratings behind it against 95, so its average is the more settled of the two. Written reviews are what separate them: 100% of Muscle Mastery's written reviews are positive against 80% of Built With Science+'s.
Muscle Mastery ships an update every 2 months, Built With Science+ fortnightly. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.
| Parameter | Muscle Mastery | Built With Science+ |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (95 ratings) — better | 4.8 (5K ratings) |
| Positive reviews | 100.0% of reviews — better | 79.8% of reviews |
| Number of ratings | 95 | 5K — better |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, Apple Watch |
| Requires iOS | 15.5 — better | 16.2 |
| Further details — not scored | ||
| Size | 164 MB | 235 MB |
| Age rating | 4+ | 4+ |
| Developer | L8R Lifestyle, LLC | Built With Science Holdings Corp |
Customer experience
Muscle Mastery
Built With Science+
Bugs and requests
Muscle Mastery
Not enough reviews yet to summarise bugs or requests.
Built With Science+
Reported bugs
4 issues- Workout data sometimes gets lost or marked incomplete
- App takes a long time to open
- Login and sign-up issues for existing customers
- Inconsistent exercise recommendations and adjustments
Requested features
5 requests- Add ability to create and save custom recipes
- Integrate with Apple Health and other fitness platforms
- Provide more flexibility in workout scheduling
- Enhance human coaching and support features
- Improve performance and stability
In-app purchases
Muscle Mastery
No in-app purchases
Built With Science+
- Monthly Membership14 Days trial$29.991 Month
- Annual Membership14 Days trial$189.001 Year
- Intermediate Program Unlock$49.00
- Beginner Program Unlock$49.00
Questions
Is Muscle Mastery free?
Is Built With Science+ free?
Which has better reviews, Muscle Mastery or Built With Science+?
Do Muscle Mastery or Built With Science+ have ads?
Which is updated more often, Muscle Mastery or Built With Science+?
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