# Build Muscle Strength Training vs Performance Dynamics

The clearest difference is in-app purchases: Performance Dynamics at none against Build Muscle Strength Training's 10. Build Muscle Strength Training's advantage is update cadence (monthly vs every 9 months) and device support. On price and iOS requirement there is nothing between them.

Both are free to download. Build Muscle Strength Training sells 10 in-app purchases, starting at $0.99 per month. Performance Dynamics asks for nothing beyond the download.

Build Muscle Strength Training ships an update monthly, Performance Dynamics every 9 months. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Build Muscle Strength Training | Performance Dynamics |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 30.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | — |
| Update frequency | **Monthly** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 111 MB | 55 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Loyal Health & Fitness, Inc.](https://appshunter.io/developer/1088263310) | [TeamUp Sports](https://appshunter.io/developer/1449504626) |

## What reviewers say

### Build Muscle Strength Training

[App page](https://appshunter.io/ios/app/build-muscle-strength-training/id739501167)

This app offers structured strength training programs designed to help users build muscle and avoid plateaus. It provides audio guidance, instructional videos, and customized weekly workouts, with an optional coaching feature that combines music and trainer motivation.

**Highlights:** Progression training programs, Works all major muscle groups, Audio guidance from digital trainer, Customized weekly workouts, HD instructional videos, Offline workout capability, Fitivity Coaching feature

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |
| Fitivity Premium | $1.99 | per month |
| Yearly Subscription | $5.99 | per year |
| Yearly Subscription | $9.49 | per year |
| Entire Program - Ripped Body | $4.99 | one-time |
| Entire Program - Triceps, Biceps & Forearms | $4.99 | one-time |
| Entire program - Chest Muscles | $4.99 | one-time |
| Entire Program - Six Pack | $4.99 | one-time |
| Entire Program - Toned Butt | $4.99 | one-time |
| Purchase levels of all programs | $14.99 | one-time |


### Performance Dynamics

[App page](https://appshunter.io/ios/app/performance-dynamics/id6447365555)

**In-app purchases:** none


## Frequently asked questions

### Is Build Muscle Strength Training free?

Build Muscle Strength Training is free to download, with in-app purchases available.

### Is Performance Dynamics free?

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

### Which is updated more often, Build Muscle Strength Training or Performance Dynamics?

Build Muscle Strength Training ships an update monthly, and Performance Dynamics every 9 months. Most recently, Build Muscle Strength Training was updated on October 3, 2026 and Performance Dynamics on October 9, 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.*