# Built With Science+ vs Carbon Step

The clearest difference is in-app purchases: Carbon Step at none against Built With Science+'s 4. Built With Science+'s advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Built With Science+ sells 4 in-app purchases, starting at $29.99 per month. Carbon Step asks for nothing beyond the download.

Built With Science+ ships an update every 2 weeks, Carbon Step every 9 days. The most recent releases landed on September 25, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | Built With Science+ | Carbon Step |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (3.9K ratings)](https://appshunter.io/ios/app/built-with-science-plus/id6446000532/reviews)** | — |
| Number of ratings | **3.9K** | — |
| Positive reviews | 79.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Subscription | — |
| Size | 233 MB | 45 MB |
| Requires iOS | **16.2** | 17.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Built With Science Holdings Corp](https://appshunter.io/developer/1559732895) | [Mert Huseyin Ciloglu](https://appshunter.io/developer/1849760865) |

## 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


### Carbon Step

[App page](https://appshunter.io/ios/app/carbon-step/id6754710198)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Built With Science+ free?

Built With Science+ is free to download, with in-app purchases available.

### Is Carbon Step free?

Carbon Step is free to download, with no in-app purchases.

### Do Built With Science+ or Carbon Step have ads?

Carbon Step shows ads; Built With Science+ does not.

### Which is updated more often, Built With Science+ or Carbon Step?

Built With Science+ ships an update every 2 weeks, and Carbon Step every 9 days. Most recently, Built With Science+ was updated on September 25, 2026 and Carbon Step on June 5, 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.*