Comparison

TWS Training vs Castle Flexx

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

TWS Training

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
Read full description

Welcome to the world of modern mobility training! If you're here, chances are you're stiff as a rock... Whether it’s from an injury, life getting in the way, or you’re a seasoned pro looking to get more from your body, at TWS Training we’re all about making elite-level training accessible to everyone so you can regain control of your training, improve your mobility, boost your performance – and ultimately live better! WORKOUTS: - Train anywhere, anytime, with programs designed for garage gyms, functional training facilities, or wherever you prefer to train. - Access in-depth, guided video tutorials covering mobility techniques and complex compound exercises, ensuring proper form and progression. - Improve your range of motion and flexibility with proven techniques that deliver results in just two minutes. - Access exclusive content on how to maximize your TWS gear, including Performance Bands, Glute Bands, and Compression Floss. - Choose from our functional training programs, exercise protocols, or explore extensive exercise libraries to supercharge your training sessions by targeting specific body parts or mobility concerns. - Use substitute exercises to maximize your workouts, regardless of your equipment setup. - Track your progress with structured load progressions for strength and muscle growth. - Start with our Free “TWS Foundations” Course on mobility and functional training, designed to build a solid foundation for future success. HOW IT WORKS: - Download for Free: Start today with our free “TWS Foundations” Course! - Access Your Content: If you’ve purchased programs or products on the TWS Store, they’ll be unlocked and ready to go in your account. - Subscription Option: Upgrade to our in-app subscription for unlimited access to all exercise programs, protocols, and content libraries. - Cancel Anytime: Manage your subscription easily through the App Store settings. No hidden fees, no hassle. READY TO MOVE BETTER? Join thousands of users who have improved their flexibility, strength, and performance with TWS Training. Download now and start your journey today! TESTIMONIALS: “Physical therapy was becoming too expensive, and I’m so glad I found Scott. I’m finally getting into a routine where I can focus on my health and resolve issues I’ve dealt with for years.” - Jovanny P. “Finding Scott has been a blessing. His world-class exercises and clear communication have been a game-changer in my daily life.” - David A. “Scott's unique expertise in both mobility and strength shines through in his informative video library. He’s to the point and doesn’t waste time. If you’re looking to take your mobility and training to the next level, look no further.” - Bobby B. INFORMATION ABOUT THE APP AND PURCHASE OPTIONS By signing up, you will get access to subscription(s) that include features such as progress tracking, and offline sync. The download of TWS Training is free of charge. Should you use TWS Training app to access in-app content, we offer one of the following options: Subscription based plan(s) - a payment will be charged to your credit card through your App Store account. A subscription renews automatically unless canceled at least 24 hours prior to the end of the subscription period. There is no increase in price when renewing. Subscription(s) can be managed and auto-renewal turned off in Account Settings in the App Store after purchase. One-time purchase based plan(s) - a payment will be charged to your credit card only once. Read our full Terms of Service and our Privacy Policy: https://passion.io/terms-of-service https://passion.io/privacy-policy

About

Castle Flexx

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
Read full description

The Future of Mobility is here. We design award winning devices that address the root cause of common chronic pain issues. We've kept our app very simple: Shop or Train (FlexxLab) Chronic Pain issues we address: Plantar Fasciitis Back Pain (L4 L5) Shoulder Impingement Hip Pain Tight Calves Tight Hamstrings Achilles Wrist and forearm Tech Neck

Screenshots

TWS Training4 screens
Castle Flexx4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
TWS Training versus Castle Flexx: the parameters behind the verdict, then further details
ParameterTWS TrainingCastle Flexx
PriceFreeFree
Rating4.5 (15 ratings) — better3.0 (32 ratings)
Positive reviews81.8% of reviews — better18.8% of reviews
Number of ratings1532 — better
Update frequencyEvery 3 monthsMonthly — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better16.4
Further details — not scored
Size90 MB80 MB
Age rating4+4+
DeveloperScott BaileyCastle Flexx

Customer experience

TWS Training

All ratings15 ratings
Positive86.7%
Neutral6.7%
Negative6.7%
Written reviews11 reviews
Positive81.8%
Neutral9.1%
Negative9.1%

Castle Flexx

All ratings32 ratings
Positive46.9%
Neutral3.1%
Negative50.0%
Written reviews16 reviews
Positive18.8%
Neutral0.0%
Negative81.3%

In-app purchases

3 purchases

TWS Training

Subscriptions1
  • TWS Training programs7 Days trial$24.991 Month
One-time2
  • TWS Clutch Kit$24.99
  • One Time Subscription$99.99
None

Castle Flexx

No in-app purchases

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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