Comparison

Underwave Training vs JustStretch | Flex & Mobility

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

Head to head
About

Underwave Training

Features
Read full description

Train breathing, breath holds, and mental control with the Underwave Method — trusted by elite ocean athletes.

About

JustStretch | Flex & Mobility

This app helps you build a daily stretching habit to improve flexibility, relieve pain, and boost overall well-being. It offers guided routines, custom workout creation, and multimedia instructions for all fitness levels.

Highlights
  • Daily stretching routines
  • Custom workout creation
  • Audio, image, and video guidance
  • Live instructor experience
  • Pain relief and injury prevention
  • Improved posture and sleep
Features
Read full description

Make Stretching a Daily Habit for a Healthier You Welcome to JustStretch, your go-to app for making stretching a seamless part of your daily routine. Our app is designed to help you enhance your flexibility and maintain your natural range of motion, no matter your age or fitness level. JustStretch Routines: - "Morning Energizer": Kickstart your day with stretches that boost energy and prepare your body for the day ahead. - "Desk Break": Counteract the effects of sitting with these seated stretches that target the shoulders, back, and neck. - "Full Body Flow": A comprehensive routine that targets key muscles and joints throughout your entire body. - "Relax & Unwind": Gentle stretches to help you relax and prepare for a restful night's sleep. - "Flexibility Challenge": Advanced routines for those looking to push their flexibility to new heights. Create Custom Workouts Design personalized stretching routines to meet your fitness goals. Multimedia Guidance Choose from audio, image, or video instructions for clear guidance on every move. Favorite Workouts at a Glance Save your favorite sessions for quick and easy access. Live Instructor Experience Enjoy the motivation and accuracy of real instructor-led classes from anywhere. Easy-to-Use Interface: JustStretch guides you through each stretch with custom illustrations and a built-in timer. Detailed instructions and benefits are provided for every exercise Benefits of Stretching with JustStretch: - Enhanced Flexibility: Boost your muscle and joint mobility for a greater range of motion. - Pain Relief: Alleviate discomfort in key areas like the lower back, neck, hips, and shoulders. - Safety in Motion: Lower your risk of injuries during sports and other physical activities. - Better Sleep & Energy: Improve sleep quality and maintain high energy levels throughout the day. - Posture & Strength: Strengthen your core and improve your posture for better overall alignment. - Stress Management: Reduce stress and anxiety with regular stretching sessions. - Performance Enhancement: Boost your athletic performance with increased agility and strength. - Circulation Improvement: Enhance blood flow for overall health and well-being. - Rapid Recovery: Speed up muscle recovery after workouts or physical exertion. - Balance & Coordination: Improve your balance and coordination for better body control. - Pain Elimination: Target and eliminate chronic pain in the lower back, neck, and hips. - Well-being: Elevate your overall well-being with improved posture and reduced stress. Why JustStretch? - Simple & Affordable: Access hundreds of stretches and yoga poses, all designed to be easy on the wallet and simple to follow. - Convenient Routines: Choose from a variety of quick and convenient stretching routines that fit into any schedule. - All Ages & Levels: Whether you're a beginner or an experienced yogi, JustStretch has routines tailored for you. Workout where you want, when you want. From stretching and meditation to outdoor and bending, the JustStretch App makes bend workout classes and workout tracking fun and easy. No equipment is needed. Here are dozens of beginner-friendly bend classes that are easy to learn and perform, including Shoulders, Arms, Chest, Lower Back, Abdomen, Hips, Legs, and Ankle. Start your day with a bend workout that suits your needs. Choose to increase flexibility, improve strength, maintain good posture, or get fit and healthy! Download juststretch classes,take them with you wherever you go. You can practice in your living room, hotel, beach, or even sitting on a chair or sofa.yoga,making it easy to stay active and healthy no matter where bend. Feedback & Support: We're here to help! Contact us at support@juststretch.fit with any questions, feedback, or suggestions. Privacy Policy: https://www.juststretch.fit/en/privacy-policy.html User Terms of Service: https://www.juststretch.fit/en/terms.html

Screenshots

Underwave Training4 screens
JustStretch | Flex & Mobility4 screens

Verdict

The call

The clearest difference is in-app purchases: Underwave Training at none against JustStretch | Flex & Mobility's 18. Underwave Training also leads on ads (none vs shown). On price, update cadence, device support 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. JustStretch | Flex & Mobility sells 17 in-app purchases, starting at $7.49 per month. Underwave Training asks for nothing beyond the download.

UpkeepUpdate frequency

Underwave Training ships an update every 3 weeks, JustStretch | Flex & Mobility every 2 weeks. The most recent releases landed on September 19, 2026 and October 15, 2026 respectively.

Scorecard2 real differences · 8 level
Underwave Training versus JustStretch | Flex & Mobility: the parameters behind the verdict, then further details
ParameterUnderwave TrainingJustStretch | Flex & Mobility
PriceFreeFree
Rating—4.7 (2.4K ratings) — better
Positive reviews—64.1% of reviews
Number of ratings—2.4K — better
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.013.0
Further details — not scored
Size30 MB104 MB
Age rating4++17
DeveloperAugusto CarraraTechPioneers Limited

Bugs and requests

Underwave Training

Not enough reviews yet to summarise bugs or requests.

JustStretch | Flex & Mobility

Reported bugs

2 issues
  • App not working after latest update
  • Inability to open app on certain devices

Requested features

2 requests
  • Preparation time before transitions
  • Ability to use app on multiple devices

In-app purchases

None

Underwave Training

No in-app purchases

17 purchases

JustStretch | Flex & Mobility

Subscriptions15
  • 1 Month Premium$7.491 Month
  • 1 Month Premium$9.991 Month
  • 1 Month Premium$19.991 Month
Show 12 more
  • 3 Months Premium$19.993 Months
  • 3 Months Premium$29.993 Months
  • 12 Months Premium$29.991 Year
  • LUCKY DRAW PRIZE$29.991 Year
  • 12 Months Premium$30.991 Year
  • 12 Months Premium$35.991 Year
  • 12 Months Premium$37.991 Year
  • One Year Membership$39.991 Year
  • 12 Months Premium$47.991 Year
  • 7-Day Free Trial7 Days trial$47.991 Year
  • one year membership$49.991 Year
  • 12 Months Premium$89.991 Year
One-time2
  • Stretch Guide Ebook Bundle$9.99
  • Stretch Guide Ebook Bundle$12.99

Questions

Is Underwave Training free?
Underwave Training is free to download, with no in-app purchases.
Is JustStretch | Flex & Mobility free?
JustStretch | Flex & Mobility is free to download, with in-app purchases available.
Do Underwave Training or JustStretch | Flex & Mobility have ads?
JustStretch | Flex & Mobility shows ads; Underwave Training does not.
Which is updated more often, Underwave Training or JustStretch | Flex & Mobility?
Underwave Training ships an update every 3 weeks, and JustStretch | Flex & Mobility every 2 weeks. Most recently, Underwave Training was updated on September 19, 2026 and JustStretch | Flex & Mobility on October 15, 2026.

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