Muscle & Motion vs Strenf
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Muscle & Motion
This app provides a 3D learning platform to understand posture from an anatomical and biomechanical perspective. It visualizes muscular patterns, common postural faults, and offers corrective exercises. Ideal for professionals and individuals seeking to improve posture and movement.
- 3D Postural Analysis Library
- Corrective Exercise Library
- Biomechanical Principles Visualization
- Muscle Activation in 3D
- Common Postural Faults Explained
- Alignment and Movement Learning
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Understand posture from the inside out. The Posture app by Muscle & Motion turns your device into a powerful 3D learning platform that reveals the anatomy, biomechanics, and muscular patterns behind good (and poor) posture. Explore common postural faults, watch muscles activate in 3D, and learn how alignment influences movement, performance, and pain. Whether you’re a therapist, trainer, movement educator, student, or someone working to improve your own posture, this app helps you see what’s really happening beneath the surface. Why Physical Therapists, clinicians & movement professionals love it - Makes complex posture concepts easy to understand through clear 3D animations - Shows exactly which muscles are overactive, underactive, tight, or lengthened - Helps explain posture to clients and patients far better than static images - Reveals the biomechanics behind common faults like rounded shoulders, forward head, swayback, lordosis, kyphosis, and more - Provides corrective exercises and movement strategies that professionals can use immediately Key Features • 3D Postural Analysis Library Understand why issues like kyphosis, lordosis, or flat back develop. The app uses clear 3D visuals to show how muscular imbalances create each postural pattern, and provides guided exercises that can help you correct and improve them over time. • Corrective Exercise Library Access targeted strengthening and mobility exercises for improving alignment. • Biomechanical Principles Made Simple See how the brain, muscles, and joints coordinate to maintain posture. Learn about load distribution, joint alignment, center of gravity, and functional stability, all visualized in 3D. Who is this app for? The Posture app is built for anyone who wants to understand and improve posture, including: - Physiotherapists, chiropractors & rehab professionals - Personal trainers & corrective exercise specialists - Yoga, Pilates & movement teachers - Kinesiology and physical therapy students - University and college instructors - Strength coaches & athletic trainers - Massage therapists & bodyworkers - Individuals working on posture, mobility, or pain reduction Use it to assess posture, teach alignment, choose corrections, create programs, or simply deepen your understanding of human movement. Free Access & Subscriptions You can download the app and explore part of the posture content for free, including sample 3D lessons and corrective exercises. To unlock the full library (including all posture analyses, 3D anatomy content, corrective exercises, and biomechanics videos) you can upgrade with an in-app subscription: - Subscriptions give you full access to all videos, lessons, and 3D content for the duration of your plan. - Subscriptions auto-renew unless you turn off auto-renew at least 24 hours before the end of the current period in your Apple ID settings. You can manage or cancel your subscription at any time in Settings > Apple ID > Subscriptions on your device. For full details: Privacy Policy: https://www.muscleandmotion.com/privacy/ Terms of Use: https://www.muscleandmotion.com/terms-of-use/ Support Have a question, feature request or need help with your subscription? Our team is happy to help at info@muscleandmotion.com.
Strenf
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Know exactly how strong you are. Most fitness apps just log your sets. Strenf tells you what they actually mean. Every lift you record is graded against real strength standards — so you always know whether you're Novice, Intermediate, Advanced, or Elite, and exactly how much more you need to reach the next tier. TRACK WHAT MATTERS • Log workouts in seconds — programs, exercises, sets, and reps • Automatic estimated 1RM, top set, and volume for every lift • Clean progress trends so you can see the line go up KNOW YOUR LEVEL • Strength tiers from Untrained to Elite, graded by bodyweight, age, and sex • "+X lbs to the next level" on every lift • Standards tables so you know how you stack up BRING YOUR CREW • Follow friends and see where you rank • "Size Up" head-to-head comparisons • Groups, mutuals, and leaderboards to keep everyone honest • Earn badges as you hit milestones CARDIO TOO • GPS run & walk tracking with distance, pace, and splits PRIVATE BY DEFAULT • Every workout stays private until you choose to share it • Make your profile public only when you're ready Stop guessing how strong you are. Start knowing. Strenf. Know your number.
Screenshots
Verdict
The clearest difference is in-app purchases: Strenf at none against Muscle & Motion's 4. Strenf also leads on update cadence (every 2 weeks vs monthly) and iOS requirement (15.0 vs 17.0). On price, ads and device support 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
Both are free to download. Muscle & Motion sells 3 in-app purchases, starting at $15.00 per month. Strenf asks for nothing beyond the download.
Muscle & Motion ships an update monthly, Strenf every 2 weeks. The most recent releases landed on October 29, 2026 and October 10, 2026 respectively.
| Parameter | Muscle & Motion | Strenf |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (681 ratings) — better | — |
| Positive reviews | 76.7% of reviews | — |
| Number of ratings | 681 — better | — |
| Update frequency | Monthly | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 183 MB | 4 MB |
| Age rating | 17+ | 4+ |
| Developer | Muscle & Motion LTD | Bryan Paysen |
Bugs and requests
Muscle & Motion
Reported bugs
2 issues- Paid subscription not working, only free version available
- Login issues
Requested features
2 requests- Add Russian language
- Add Spanish language
Strenf
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Muscle & Motion
- Monthly Full Access$15.001 Month
- Yearly Full Access2 variants$89.001 Year
- Yearly Subscription Bonus1 Year trial$89.001 Year
Strenf
No in-app purchases









