# Muscle Mastery vs Built With Science+

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.

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 29, 2026 respectively.

## The numbers

| Metric | Muscle Mastery | Built With Science+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (95 ratings)](https://appshunter.io/ios/app/muscle-mastery/id1581495624/reviews)** | [4.8 (5K ratings)](https://appshunter.io/ios/app/built-with-science-plus/id6446000532/reviews) |
| Number of ratings | 95 | **5K** |
| Positive reviews | **100.0% of reviews** | 79.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | **Free** | Subscription |
| Size | 164 MB | 235 MB |
| Requires iOS | **15.5** | 16.2 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [L8R Lifestyle, LLC](https://appshunter.io/developer/1581495626) | [Built With Science Holdings Corp](https://appshunter.io/developer/1559732895) |

## What reviewers say

### Muscle Mastery

[App page](https://appshunter.io/ios/app/muscle-mastery/id1581495624)

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.

**Highlights:** 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

**Features:** Apple Wallet, Apple Watch app, Vision Pro support

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Muscle Mastery free?

Muscle Mastery is free to download, with no in-app purchases.

### Is Built With Science+ free?

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

### Which has better reviews, Muscle Mastery or Built With Science+?

Muscle Mastery is rated higher. Muscle Mastery averages 5.0 out of 5 from 95 ratings, while Built With Science+ averages 4.8 from 5K ratings.

### Do Muscle Mastery or Built With Science+ have ads?

Neither Muscle Mastery nor Built With Science+ shows ads.

### Which is updated more often, Muscle Mastery or Built With Science+?

Muscle Mastery ships an update every 2 months, and Built With Science+ fortnightly. Most recently, Muscle Mastery was updated on October 25, 2026 and Built With Science+ on October 29, 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.*