# Proving Ground vs Muscle & Flow

The clearest difference is device support: Muscle & Flow at 3 against Proving Ground's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Proving Ground | Muscle & Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (210 ratings)](https://appshunter.io/ios/app/proving-ground/id1530592082/reviews)** | — |
| Number of ratings | **210** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Free | — |
| Size | 38 MB | 91 MB |
| Requires iOS | 16.0 | **15** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Proving Ground Limited Liability Corporation](https://appshunter.io/developer/1530592084) | [Muscle & Flow](https://appshunter.io/developer/1694764222) |

## What reviewers say

### Proving Ground

[App page](https://appshunter.io/ios/app/proving-ground/id1530592082)

Book functional training classes and personal training sessions at a revolutionary studio. View schedules, reserve spots in group classes, and purchase class packages directly through the app. Focus on smart training with mobility and recovery integrated into every workout.

**Highlights:** Book training classes, View class schedules, Purchase class packages, Personal training sessions, Functional training focus, Mobility and recovery integration

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

**In-app purchases:** none


### Muscle & Flow

[App page](https://appshunter.io/ios/app/muscle-and-flow/id1637484112)

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

**In-app purchases:** none


## Frequently asked questions

### Is Proving Ground free?

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

### Is Muscle & Flow free?

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

### Do Proving Ground or Muscle & Flow have ads?

Neither Proving Ground nor Muscle & Flow shows ads.

### Which is updated more often, Proving Ground or Muscle & Flow?

Proving Ground ships an update monthly, and Muscle & Flow monthly. Most recently, Proving Ground was updated on November 3, 2026 and Muscle & Flow on October 27, 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.*