Comparison

re.flex vs Jen

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

Head to head
About

re.flex

This app helps you recover from joint pain at home with medically validated exercises. It uses patented sensor technology for accurate movement tracking and provides real-time feedback to improve exercise execution. Detailed reports track your progress and pain levels.

Highlights
  • Medically validated exercise programs
  • Patented sensor technology for movement tracking
  • Real-time acoustic and 3D visual feedback
  • Personalized digital exercise assistant
  • Detailed training and progress reports
  • Flexible training scheduling
Read full description

re.flex supports you to actively recover from your joint pain at home. It is aimed in particular at users with osteoarthritis of the knee and hip joints. The patented sensor technology developed by us specifically for exercise therapy enables the minutely accurate tracking of your movements and provides you with almost latency-free feedback on the quality and quantity of the execution of your movements. IMPORTANT: To be able to train with re.flex, you need (a) a sensor kit and (b) an activation code. Health insurance in Germany: Sensor Kit: You will receive the sensor kit from our German distribution partner. After you create your account in the app, you will receive an order form for the sensor kit via email. Activation code: If you have statutory health insurance, you will receive the activation code from your health insurance company. If you are privately insured, you will get the unlock code from our distribution partner. NO health insurance in Germany: Contact us at info@reflex.help to find out how to get the sensor kit and activation code. re.flex at a glance - Medically validated - The exercise programs have been developed in cooperation with the most renowned universities in sports medicine. They are based on the current state of the art in physical therapy as well as current study-based guidelines to ensure you the highest possible quality standard. - Proven exercises - The exercise programs include simple exercises to improve your strength, flexibility and motor skills as well as reduce your joint pain. Personal Exercise Assistant - With re.flex, you get a personal digital exercise assistant that interactively guides you through the exercises with clear instructions. - Objective measurement of movement - Using movement sensors, re.flex is able to give you immediate live feedback on whether you are performing the exercise correctly or incorrectly. You receive both acoustic and visual feedback in 3D. - 3D Visual Feedback - 3D visual feedback gives you detailed information about your own movement in space and clear instructions on how to perform the exercise. - Audible Feedback - Audible feedback allows you to perform your exercises "hands-off" if you already know how to do the exercise. - Positive behavioral correction - Correct behavior is positively reinforced, and incorrect behavior is given specific instructions on how to perform the exercise correctly. - Detailed training reports - re.flex provides you detailed graphical reports on various aspects of your training. For example, you can track the progress of your training fidelity, the development of pain and also qualitative metrics such as the execution accuracy of your exercises. Thus, the training report provides both you and the doctor (in case you want to share your report with your doctor) with objective transparency about your training progress. - Flexible training time - re.flex allows you to choose the time and place of your training week. If you miss a workout, you will be reminded automatically. Missed workouts can be made up on break days to prevent both under- and overtraining. - Flexible training routine - If the patient is unable to perform an exercise, the workout program always provides alternative exercises, or the option to skip the exercise if necessary. Health insured in Germany: Mail: digital@sporlastic.de Tel: +49 7022 705 181 Business hours: Monday to Thursday 8:00 – 17:00 and Friday 8:00 – 16:00 Not health insured in Germany: Web: www.reflex.help Mail: info@reflex.help

About

Jen

This app provides expert-led physical therapy exercise plans designed by doctors to improve mobility, reduce pain, and increase strength. It offers personalized plans based on your progress and educational insights into each movement, empowering you for long-term health.

Highlights
  • Expert-driven exercise plans
  • Personalized for your progress
  • Understand and overcome injuries
  • Targeted healing plans
  • Community challenges
  • Preventative care focus
Features
Read full description

Jen: Your Physical Therapy App Revolutionize Your Health with Expert-Led Physical Therapy Jen is not just an app; it's your personal gateway to enhanced mobility, reduced pain, and increased strength, all guided by the unparalleled knowledge of experienced doctors of physical therapy. It's time to experience the profound impact of professional physical therapy in the palm of your hand. Tailored Physical Therapy at Your Fingertips: -Expert-Driven Plans: Discover the power of physical therapy with exercise plans meticulously crafted by doctors specializing in physical therapy. Each plan is a step towards unlocking your body's full potential for mobility and freedom from pain. -Personalized for Your Progress: Your journey is unique, and so is your path to improvement. Jen's initial assessment tailors your experience, ensuring that your move towards enhanced strength and flexibility is both personal and impactful. -Understand and Overcome: Each exercise isn't just a movement; it's a lesson in understanding your body. Learn the 'why' behind your workouts, empowering you with the knowledge to prevent future injuries and maintain long-term health. Exclusive Benefits for Premium Members: -Targeted Healing: Dive deeper with specialized plans designed for individual body parts, from your neck down to your ankles, ensuring focused progress and pain relief. -Community Strength: Join a supportive community engaging in challenges that inspire and push you further, all while celebrating every victory together. Jen's Commitment to Your Health: -Beyond Exercise: Jen's approach goes beyond simple workouts. It's about integrating meaningful physical therapy principles into your daily routine, transforming how you move and live. -Affordable Health Investment: Save on healthcare costs by investing in preventative care and effective physical therapy, reducing the need for expensive treatments and consultations. -Maximize Your Life: With Jen, reduce the hours spent in waiting rooms and increase the time enjoying life to its fullest. Get back to doing what you love, pain-free and with improved mobility. Start Your Journey with Jen Today: Embark on a transformative path with Jen, where physical therapy meets personal triumph. It's not just about feeling better; it's about becoming the best version of yourself, strong, pain-free, and fully mobile. Visit www.jen.health now to take the first step towards a healthier, happier you. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

re.flex4 screens
Jen4 screens

Verdict

The call

The clearest difference is in-app purchases: re.flex at none against Jen's 3. re.flex also leads on iOS requirement (12.0 vs 16.0). Jen's advantage is ratings volume (478 vs 1). On price, rating, update cadence and ads 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. Jen sells 3 in-app purchases, starting at $29.99 per month. re.flex asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for re.flex against 4.9 for Jen. That said, the two scores are not equally well evidenced: Jen has 478 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

re.flex ships an update every 3 weeks, Jen every 5 weeks. The most recent releases landed on September 16, 2026 and September 29, 2026 respectively.

Scorecard4 real differences · 6 level
re.flex versus Jen: the parameters behind the verdict, then further details
Parameterre.flexJen
PriceFreeFree
Rating5.0 (1 ratings) — better4.9 (478 ratings)
Positive reviews—83.3% of reviews
Number of ratings1478 — better
Update frequencyEvery 3 weeks — betterEvery 5 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size231 MB123 MB
Age rating4+17+
DeveloperKineto Tech RehabThe Mobility Method LLC

Customer experience

re.flex

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Jen

All ratings478 ratings
Positive98.3%
Neutral0.6%
Negative1.0%
Written reviews42 reviews
Positive83.3%
Neutral7.1%
Negative9.5%

Bugs and requests

re.flex

Not enough reviews yet to summarise bugs or requests.

Jen

Reported bugs

5 issues
  • No sound on videos in app
  • Paid programs not accessible on iPad
  • Content access failures on app and web
  • Account deletion not terminating subscriptions
  • Customer service unresponsiveness after initial contact

Requested features

3 requests
  • Chromecast support for video casting
  • Improved UI/UX design
  • Better cross-device compatibility

In-app purchases

None

re.flex

No in-app purchases

3 purchases

Jen

Subscriptions2
  • Monthly7 Days trial$29.991 Month
  • Yearly7 Days trial$189.991 Year
One-time1
  • Wrist & Elbow Plan$9.99

Questions

Is re.flex free?
re.flex is free to download, with no in-app purchases.
Is Jen free?
Jen is free to download, with in-app purchases available.
Which has better reviews, re.flex or Jen?
re.flex is rated higher. re.flex averages 5.0 out of 5 from 1 ratings, while Jen averages 4.9 from 478 ratings.
Do re.flex or Jen have ads?
Neither re.flex nor Jen shows ads.
Which is updated more often, re.flex or Jen?
re.flex ships an update every 3 weeks, and Jen every 5 weeks. Most recently, re.flex was updated on September 16, 2026 and Jen on September 29, 2026.

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