# Built With Science+ vs Muscle Rest Timer

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.

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.

## The numbers

| Metric | Built With Science+ | Muscle Rest Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4.1K ratings)](https://appshunter.io/ios/app/built-with-science-plus/id6446000532/reviews)** | — |
| Number of ratings | **4.1K** | — |
| Positive reviews | 79.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Subscription | — |
| Size | 233 MB | 9 MB |
| Requires iOS | **16.2** | 26.1 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Built With Science Holdings Corp](https://appshunter.io/developer/1559732895) | [Raliworks LLC](https://appshunter.io/developer/1853667826) |

## 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


### Muscle Rest Timer

[App page](https://appshunter.io/ios/app/muscle-rest-timer/id6762502883)

**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 Muscle Rest Timer free?

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

### Do Built With Science+ or Muscle Rest Timer have ads?

Neither Built With Science+ nor Muscle Rest Timer shows ads.

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

Built With Science+ ships an update fortnightly, and Muscle Rest Timer fortnightly. Most recently, Built With Science+ was updated on October 16, 2026 and Muscle Rest Timer on October 2, 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.*