# TWS Training vs Castle Flexx

The clearest difference is review sentiment: TWS Training at 82% against Castle Flexx's 19%. TWS Training also leads on rating (4.5 vs 3.0) and device support (3 vs 1). Castle Flexx's advantage is in-app purchases (none vs 3) and update cadence (monthly vs every 3 months). On price, ratings volume, ads and iOS requirement there is nothing between them.

Both are free to download. TWS Training sells 3 in-app purchases, starting at $24.99 per month. Castle Flexx asks for nothing beyond the download.

TWS Training holds the better App Store score, 4.5 against 3.0. Both are backed by a comparable volume of ratings — 15 and 32 respectively. Written reviews point the same way: 82% of TWS Training's written reviews are positive against 19% of Castle Flexx's.

TWS Training ships an update every 3 months, Castle Flexx monthly. The most recent releases landed on July 7, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | TWS Training | Castle Flexx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (15 ratings)](https://appshunter.io/ios/app/tws-training/id1595137752/reviews)** | [3.0 (32 ratings)](https://appshunter.io/ios/app/castle-flexx/id6450963146/reviews) |
| Number of ratings | 15 | **32** |
| Positive reviews | **81.8% of reviews** | 18.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 90 MB | 80 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Scott Bailey](https://appshunter.io/developer/1595137754) | [Castle Flexx](https://appshunter.io/developer/1695941246) |

## What reviewers say

### TWS Training

[App page](https://appshunter.io/ios/app/tws-training/id1595137752)

Improve your mobility, flexibility, and strength with guided workouts and expert instruction. Access a free foundational course and unlock premium content through subscription for unlimited training.

**Highlights:** Guided video tutorials for mobility and exercises, Improve range of motion and flexibility, Exclusive content for TWS gear, Functional training programs and exercise libraries, Substitute exercises for any equipment, Progress tracking for strength and muscle growth, Free foundational mobility course

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TWS Training programs | $24.99 | per month |
| TWS Clutch Kit | $24.99 | one-time |
| One Time Subscription | $99.99 | one-time |


### Castle Flexx

[App page](https://appshunter.io/ios/app/castle-flexx/id6450963146)

This app offers a simple interface to shop for award-winning devices designed to alleviate chronic pain. It also provides a training section, FlexxLab, to help users manage conditions like plantar fasciitis, back pain, and hip pain.

**Highlights:** Shop for pain relief devices, FlexxLab training section, Addresses chronic pain issues, Supports iPhone and iPod, Designed for mobility

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

**In-app purchases:** none


## Frequently asked questions

### Is TWS Training free?

TWS Training is free to download, with in-app purchases available.

### Is Castle Flexx free?

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

### Which has better reviews, TWS Training or Castle Flexx?

TWS Training is rated higher. TWS Training averages 4.5 out of 5 from 15 ratings, while Castle Flexx averages 3.0 from 32 ratings.

### Do TWS Training or Castle Flexx have ads?

Both TWS Training and Castle Flexx show ads.

### Which is updated more often, TWS Training or Castle Flexx?

TWS Training ships an update every 3 months, and Castle Flexx monthly. Most recently, TWS Training was updated on July 7, 2026 and Castle Flexx on September 21, 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.*