Comparison

SUND vs KINVENT

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

Head to head
About

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.

Highlights
  • Emits vibration
  • Plays soothing sounds
  • Promotes relaxation
  • Offers a calming experience
  • Designed for stress relief
Features
Read full description

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

About

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.

Highlights
  • Real-time biofeedback with visualizations
  • Over 100 guided protocols
  • Personalized patient profiles
  • Offline assessment capability
  • Local and cloud data storage
  • Multilingual support
Features
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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

SUND4 screens
KINVENT4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on June 1, 2026 and September 16, 2026 respectively.

Scorecard2 real differences · 8 level
SUND versus KINVENT: the parameters behind the verdict, then further details
ParameterSUNDKINVENT
PriceFreeFree
Rating5.0 (2 ratings)5.0 (3 ratings)
Positive reviews100.0% of reviews — better80.0% of reviews
Number of ratings23 — better
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.0 — better15.6
Further details — not scored
Size20 MB473 MB
Age rating4+4+
DeveloperColin MacintoshKINVENT BIOMECANIQUE

Customer experience

SUND

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

KINVENT

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

2 purchases

SUND

Subscriptions2
  • One month subscription$1.991 Month
  • One year subscription$19.991 Year
8 purchases

KINVENT

Subscriptions8
  • Kforce Pro Monthly Licence$34.991 Month
  • Starter Monthly License$34.991 Month
  • Premium Monthly License$59.991 Month
Show 5 more
  • 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

Questions

Is SUND free?
SUND is free to download, with in-app purchases available.
Is KINVENT free?
KINVENT is free to download, with in-app purchases available.
Which has better reviews, SUND or KINVENT?
SUND and KINVENT are both rated 5.0 out of 5 on the App Store, from 2 and 3 ratings respectively.
Do SUND or KINVENT have ads?
Neither SUND nor KINVENT shows ads.
Which is updated more often, SUND or KINVENT?
SUND ships an update every 3 weeks, and KINVENT every 3 weeks. Most recently, SUND was updated on June 1, 2026 and KINVENT on September 16, 2026.

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