SUND vs KINVENT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SUND
This app provides a tranquil experience through gentle vibrations and calming audio. It's designed to help users relax and find a sense of peace. Enjoy a soothing escape from daily stress.
- Emits vibration
- Plays soothing sounds
- Promotes relaxation
- Offers a calming experience
- Designed for stress relief
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A relaxing and calming app that emits vibration with soothing sounds. Terms of service: http://sund-admin.vibe-8.com/terms-of-service Privacy policy: http://sund-admin.vibe-8.com/privacy-policy
KINVENT
This app empowers health and sports professionals to precisely track motion, force, and recovery. It offers real-time biofeedback, over 100 guided protocols, and personalized patient profiles with comprehensive reporting. Works offline with local data storage and optional cloud syncing.
- Real-time biofeedback with visualizations
- Over 100 guided protocols
- Personalized patient profiles
- Offline assessment capability
- Local and cloud data storage
- Multilingual support
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Ideal for physiotherapists and sports professionals to track motion, force & recovery The KINVENT app is fully compatible with our complete lineup of biomechanical assessment tools, empowering rehab and performance professionals with precision data across muscle activity, force, balance, and movement. Key Features: • Real-time biofeedback with clear visualizations • Over 100 guided protocols and rehab exercises • Personalized patient profiles and PDF/CSV reporting • Works offline—no internet required for assessments • Local data storage + cloud syncing when online • Multilingual support for international users Muscle Activation & Biofeedback • K-Myo – Wireless EMG sensor for real-time tracking of muscle engagement and neuromuscular control Strength Testing & Dynamometry • K-Grip – Hand dynamometer for grip strength and endurance • K-Push – Push dynamometer for isometric strength assessments • K-Pull – Pull dynamometer ideal for joint-specific strength testing • K-Bubble – Pressure dynamometer for small muscle groups and breathing exercises Force Plates & Biomechanical Analysis • K-Force Plates – Portable plates for jump testing, balance, and postural control • K-Deltas – Dual plate system for limb symmetry and dynamic force profiling • 3D Deltas – High-precision 3D force plates for elite-level multidirectional force analysis Mobility & Motion Tracking • K-Move – Inertial motion sensor for measuring range of motion (ROM), joint mobility, and movement quality • K-Power – Assess and track vertical and horizontal movements seamlessly Use Cases: • Strength and mobility assessment in clinical practice or in sports • Post-op rehab (ACL, shoulder, etc.) • Return-to-play decision-making • Performance screening in sports teams • Balance training and neuromuscular re-education Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
SUND and KINVENT both sit at 5.0 stars, but that hides the real split: 100% of SUND's written reviews are positive against 80% of KINVENT's. SUND also leads on iOS requirement (13.0 vs 15.6). On price, rating, ratings volume and update cadence 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. SUND sells 2 in-app purchases, starting at $1.99 per month and KINVENT sells 8 in-app purchases, starting at $34.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for SUND against 5.0 for KINVENT. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews are what separate them: 100% of SUND's written reviews are positive against 80% of KINVENT's.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on June 1, 2026 and September 16, 2026 respectively.
| Parameter | SUND | KINVENT |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (3 ratings) |
| Positive reviews | 100.0% of reviews — better | 80.0% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 20 MB | 473 MB |
| Age rating | 4+ | 4+ |
| Developer | Colin Macintosh | KINVENT BIOMECANIQUE |
Customer experience
SUND
KINVENT
In-app purchases
SUND
- One month subscription$1.991 Month
- One year subscription$19.991 Year
KINVENT
- Kforce Pro Monthly Licence$34.991 Month
- Starter Monthly License$34.991 Month
- Premium Monthly License$59.991 Month
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- Kforce Pro+ Monthly Licence$114.991 Month
- Excellence Monthly Licence$114.991 Month
- Kforce Pro Yearly Licence$349.991 Year
- Starter Yearly License$349.991 Year
- Premium Yearly Licence$599.991 Year








