Comparison

Built With Science+ vs Carmona OS

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

Head to head
About

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.

Highlights
  • Hyper-Personalized Workouts
  • Progressive Overload Guidance
  • Real-Time Diet Adjustments
  • AI-Powered Meal Scanner
  • 250+ Exercise Tutorials
  • Daily Knowledge Boosters
  • AI Fitness & Nutrition Assistant
Features
Read full description

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.

About

Carmona OS

This app provides adaptive training programs for lifters, offering structured workouts with personalized weight recommendations based on your performance. It includes different training splits and session lengths, with nutrition guidance to support your fitness goals.

Highlights
  • Adaptive training programs
  • Personalized weight recommendations
  • Multiple training splits (Precision, Essentials)
  • Adjustable session lengths (full, 45 Min)
  • Workout progress tracking
  • Nutrition guidance and playbooks
Features
Read full description

Carmona OS is built for lifters who want a real program and a better answer to one recurring question: what should I do next? Choose Precision or Essentials, then train the full session or switch to 45 Min when time is tight. • Precision is a five-day, pre-fatigue split for experienced lifters. • Essentials is a push, pull, legs foundation you can run two to six days a week. Past three days, repeat sessions shift their emphasis instead of repeating the same workout. Each session gives you the exercises, sets, reps, rest, and starting weights. As you train, Carmona OS learns from what you actually complete and helps you find the right next weight. Progress is earned through consistent, controlled work. A strong session can lead to an increase. A near miss can hold the weight so you can try again. If a load is clearly too heavy, or your effort answer suggests it may not be safe, the app asks you to reassess instead of giving you a recommendation it cannot defend. In 45 Min, the exercises you complete still count and the ones you do not reach are not held against you. You can also swap an exercise, pause and resume, or finish early without losing the work you completed. After each workout, your receipt explains what happened and what comes next. The Engine gives you a clear view of where you are progressing and where the app is still learning. Nutrition guidance adds daily targets and practical playbooks for eating out, lunch, and cooking at home. Carmona OS is free to download and includes your first six workouts. Continuing with Workout 7 and future training requires Carmona OS Premium, available as a monthly or annual auto-renewing subscription. Subscription terms and pricing are shown before purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Built With Science+4 screens
Carmona OS4 screens

Verdict

The call

The clearest difference is rating: Built With Science+ at 4.8 against Carmona OS's 4.0. Built With Science+ also leads on review sentiment (80% vs 50%) and ratings volume (5K vs 4). Carmona OS's advantage is monetization model (freemium vs subscription) and update cadence (every 2 days vs fortnightly). On price, ads, in-app purchases 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. Built With Science+ sells 4 in-app purchases, starting at $29.99 per month and Carmona OS sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Built With Science+ holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Built With Science+ has 5K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 80% of Built With Science+'s written reviews are positive against 50% of Carmona OS's.

UpkeepUpdate frequency

Built With Science+ ships an update fortnightly, Carmona OS every 2 days. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

Scorecard5 real differences · 5 level
Built With Science+ versus Carmona OS: the parameters behind the verdict, then further details
ParameterBuilt With Science+Carmona OS
PriceFreeFree
Rating4.8 (5K ratings) — better4.0 (4 ratings)
Positive reviews79.8% of reviews — better50.0% of reviews
Number of ratings5K — better4
Update frequencyFortnightlyEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationSubscriptionFreemium — better
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS16.215.0 — better
Further details — not scored
Size235 MB31 MB
Age rating4+17+
DeveloperBuilt With Science Holdings CorpMatthew Carmona

Customer experience

Built With Science+

All ratings4,719 ratings
Positive96.1%
Neutral1.8%
Negative2.2%
Written reviews873 reviews
Positive79.8%
Neutral6.3%
Negative13.9%

Carmona OS

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

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

Carmona OS

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

Built With Science+

Subscriptions2
  • Monthly Membership14 Days trial$29.991 Month
  • Annual Membership14 Days trial$189.001 Year
One-time2
  • Intermediate Program Unlock$49.00
  • Beginner Program Unlock$49.00
2 purchases

Carmona OS

Subscriptions2
  • Carmona OS Premium$14.991 Month
  • Carmona OS Premium$119.991 Year

Questions

Is Built With Science+ free?
Built With Science+ is free to download, with in-app purchases available.
Is Carmona OS free?
Carmona OS is free to download, with in-app purchases available.
Which has better reviews, Built With Science+ or Carmona OS?
Built With Science+ is rated higher. Built With Science+ averages 4.8 out of 5 from 5K ratings, while Carmona OS averages 4.0 from 4 ratings.
Do Built With Science+ or Carmona OS have ads?
Neither Built With Science+ nor Carmona OS shows ads.
Which is updated more often, Built With Science+ or Carmona OS?
Built With Science+ ships an update fortnightly, and Carmona OS every 2 days. Most recently, Built With Science+ was updated on October 29, 2026 and Carmona OS on October 28, 2026.

Other comparisons