# Built With Science+ vs Carmona OS

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.

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.

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.

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.

## The numbers

| Metric | Built With Science+ | Carmona OS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5K ratings)](https://appshunter.io/ios/app/built-with-science-plus/id6446000532/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/carmona-os/id6759835736/reviews) |
| Number of ratings | **5K** | 4 |
| Positive reviews | **79.8% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Subscription | **Freemium** |
| Size | 235 MB | 31 MB |
| Requires iOS | 16.2 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Built With Science Holdings Corp](https://appshunter.io/developer/1559732895) | [Matthew Carmona](https://appshunter.io/developer/1881080098) |

## What reviewers say

### Built With Science+

[App page](https://appshunter.io/ios/app/built-with-science-plus/id6446000532)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $29.99 | per month |
| Annual Membership | $189.00 | per year |
| Intermediate Program Unlock | $49.00 | one-time |
| Beginner Program Unlock | $49.00 | one-time |

**What reviewers like**

- 👍 Comprehensive fitness and nutrition tracking
- 🚀 Convenient all-in-one app
- 📚 Helpful educational lessons
- 💪 Science-backed program
- 🎯 Customized and adaptive workouts

**What reviewers complain about**

- 🐛 Occasional performance issues and bugs
- 🔍 Limited food database and recipe options
- 📱 Lack of integration with other fitness apps and devices
- 🕰️ Inflexible workout scheduling
- 💬 Limited human interaction and coaching support

**Reported bugs**

- 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**

- 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

[App page](https://appshunter.io/ios/app/carmona-os/id6759835736)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Carmona OS Premium | $14.99 | per month |
| Carmona OS Premium | $119.99 | per year |


## Frequently asked 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.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*