# The Six Compound vs The Castle Training Studio

The clearest difference is ads: The Castle Training Studio at none against The Six Compound's shown. The Six Compound's advantage is update cadence (every 6 weeks vs every 5 months) and iOS requirement (14.0 vs 16.4). On price, in-app purchases and device support there is nothing between them.

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

The Six Compound ships an update every 6 weeks, The Castle Training Studio every 5 months. The most recent releases landed on June 12, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | The Six Compound | The Castle Training Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/the-six-compound/id6744324646/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 5 months |
| Monetization | Ad-supported | — |
| Size | 151 MB | 121 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [The Six Compound, LLC](https://appshunter.io/developer/1807084599) | [Sutra Fitness, Inc.](https://appshunter.io/developer/914371834) |

## What reviewers say

### The Six Compound

[App page](https://appshunter.io/ios/app/the-six-compound/id6744324646)

Plan and schedule your fitness classes directly from your device. View class schedules, sign up for sessions, and find studio locations. Optimize your time and enjoy the convenience of managing your fitness activities on the go.

**Highlights:** View class schedules, Sign up for classes, View studio location, Optimize time, Convenient scheduling

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### The Castle Training Studio

[App page](https://appshunter.io/ios/app/the-castle-training-studio/id6760562923)

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

**In-app purchases:** none


## Frequently asked questions

### Is The Six Compound free?

The Six Compound is free to download, with no in-app purchases.

### Is The Castle Training Studio free?

The Castle Training Studio is free to download, with no in-app purchases.

### Do The Six Compound or The Castle Training Studio have ads?

The Six Compound shows ads; The Castle Training Studio does not.

### Which is updated more often, The Six Compound or The Castle Training Studio?

The Six Compound ships an update every 6 weeks, and The Castle Training Studio every 5 months. Most recently, The Six Compound was updated on June 12, 2026 and The Castle Training Studio on September 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.*