Built With Science+ vs Muscle Rest Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Muscle Rest Timer
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Muscle Rest Timer takes the guesswork out of recovery so you can train smarter and build more efficiently. After every workout, simply log which muscle groups you trained. Muscle Rest Timer automatically starts a personalized countdown for each group — 48 hours for chest, shoulders, and triceps; 72 hours for larger compound groups like back and legs. When a muscle is ready, you'll know. Need a breather between sets? Tap the built-in 90-second Quick Timer for a full-screen countdown with an audio alert the moment your rest is up — no more staring at the clock. Features: - Log your trained muscles in seconds after every session - Visual countdown timers for each muscle group - Smart notifications when a muscle group is cleared to train - 90-second Quick Timer for between-set rest - Audio tone when your rest timer finishes - Simple, clean interface built for athletes and casual gym-goers alike Whether you're lifting five days a week or just getting started, Muscle Rest Timer helps you avoid the #1 mistake in the gym: training before you've recovered. More rest where it counts means more strength, more muscle, and fewer injuries.
Screenshots
Verdict
The clearest difference is in-app purchases: Muscle Rest Timer at none against Built With Science+'s 4. Built With Science+'s advantage is device support (3 vs 1) and iOS requirement (16.2 vs 26.1). On price, update cadence and ads 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 Rest Timer asks for nothing beyond the download.
Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 16, 2026 and October 2, 2026 respectively.
| Parameter | Built With Science+ | Muscle Rest Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4.1K ratings) — better | — |
| Positive reviews | 79.8% of reviews | — |
| Number of ratings | 4.1K — better | — |
| Update frequency | Fortnightly | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Subscription | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 16.2 — better | 26.1 |
| Further details — not scored | ||
| Size | 233 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Built With Science Holdings Corp | Raliworks LLC |
Bugs and 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
Muscle Rest Timer
Not enough reviews yet to summarise bugs or requests.
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
Muscle Rest Timer
No in-app purchases
Questions
Is Built With Science+ free?
Is Muscle Rest Timer free?
Do Built With Science+ or Muscle Rest Timer have ads?
Which is updated more often, Built With Science+ or Muscle Rest Timer?
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