# BodyGuardian™ Sync vs Muscle Study Guide

The clearest difference is price: BodyGuardian™ Sync at Free against Muscle Study Guide's $6.99. BodyGuardian™ Sync also leads on update cadence (every 4 months vs every 38 months) and iOS requirement (12.4 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

BodyGuardian™ Sync is free to download; Muscle Study Guide costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

BodyGuardian™ Sync ships an update every 4 months, Muscle Study Guide every 38 months. The most recent releases landed on September 28, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | BodyGuardian™ Sync | Muscle Study Guide |
| --- | --- | --- |
| Price | **Free** | $6.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 38 months |
| Size | 14 MB | 65 MB |
| Requires iOS | **12.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Boston Scientific](https://appshunter.io/developer/469401132) | [Ryan Bittorf](https://appshunter.io/developer/650449038) |

## What reviewers say

### BodyGuardian™ Sync

[App page](https://appshunter.io/ios/app/bodyguardian-sync/id1587030827)

**In-app purchases:** none


### Muscle Study Guide

[App page](https://appshunter.io/ios/app/muscle-study-guide/id6446385667)

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

**In-app purchases:** none


## Frequently asked questions

### Is BodyGuardian™ Sync free?

BodyGuardian™ Sync is free to download, with no in-app purchases.

### Is Muscle Study Guide free?

Muscle Study Guide costs $6.99, with no in-app purchases.

### Do BodyGuardian™ Sync or Muscle Study Guide have ads?

Neither BodyGuardian™ Sync nor Muscle Study Guide shows ads.

### Which is updated more often, BodyGuardian™ Sync or Muscle Study Guide?

BodyGuardian™ Sync ships an update every 4 months, and Muscle Study Guide every 38 months. Most recently, BodyGuardian™ Sync was updated on September 28, 2026 and Muscle Study Guide on September 26, 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.*