# Muscle & Motion vs Strenf

The clearest difference is in-app purchases: Strenf at none against Muscle & Motion's 4. Strenf also leads on update cadence (every 2 weeks vs monthly) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Muscle & Motion sells 3 in-app purchases, starting at $15.00 per month. Strenf asks for nothing beyond the download.

Muscle & Motion ships an update monthly, Strenf every 2 weeks. The most recent releases landed on October 29, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Muscle & Motion | Strenf |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (681 ratings)](https://appshunter.io/ios/app/muscle-and-motion-posture/id1199500066/reviews)** | — |
| Number of ratings | **681** | — |
| Positive reviews | 76.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 183 MB | 4 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Muscle & Motion LTD](https://appshunter.io/developer/1110670112) | [Bryan Paysen](https://appshunter.io/developer/6780128368) |

## What reviewers say

### Muscle & Motion

[App page](https://appshunter.io/ios/app/muscle-and-motion-posture/id1199500066)

This app provides a 3D learning platform to understand posture from an anatomical and biomechanical perspective. It visualizes muscular patterns, common postural faults, and offers corrective exercises. Ideal for professionals and individuals seeking to improve posture and movement.

**Highlights:** 3D Postural Analysis Library, Corrective Exercise Library, Biomechanical Principles Visualization, Muscle Activation in 3D, Common Postural Faults Explained, Alignment and Movement Learning

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Full Access | $15.00 | per month |
| Yearly Full Access | $89.00 | per year |
| Yearly Subscription Bonus | $89.00 | per year |

**What reviewers like**

- 🚀 Animated anatomy magic
- 👍 Very educational
- 👍 Great body of work
- 👍 Brilliant and very helpful
- 👍 Fabulous and makes you better

**What reviewers complain about**

- 🐛 Doesn't work on iOS 18.3
- 💰 Very expensive

**Reported bugs**

- Paid subscription not working, only free version available
- Login issues

**Requested features**

- Add Russian language
- Add Spanish language


### Strenf

[App page](https://appshunter.io/ios/app/strenf/id6780128366)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Muscle & Motion free?

Muscle & Motion is free to download, with in-app purchases available.

### Is Strenf free?

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

### Do Muscle & Motion or Strenf have ads?

Neither Muscle & Motion nor Strenf shows ads.

### Which is updated more often, Muscle & Motion or Strenf?

Muscle & Motion ships an update monthly, and Strenf every 2 weeks. Most recently, Muscle & Motion was updated on October 29, 2026 and Strenf on October 10, 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.*