Visual Vertical Lite vs K
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Visual Vertical Lite
This medical app offers a quick, accurate, and affordable method for measuring subjective visual vertical in patients. It simplifies a previously complex and expensive diagnostic process, making it accessible for neurologists and vestibular rehabilitation specialists.
- Measures subjective visual vertical
- Accurate and low-cost readings
- Uses iPhone/iPad for testing
- Suitable for neurology and vestibular rehab
- Tests otolithic function
- Single readings for each eye
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Visual Vertical Lite makes subjective visual vertical (SVV) testing simple and accessible using equipment you already have. Traditional SVV testing can require specialised equipment and a controlled visual environment. Visual Vertical Lite provides a practical alternative using your iPhone, a bucket and a small piece of Blu Tack. HOW IT WORKS Mount your iPhone inside the bottom of a bucket using Blu Tack. The person being tested holds the bucket to their face and adjusts the line on screen until it appears vertical. Visual Vertical Lite measures the resulting deviation from true vertical and displays the result in degrees. TEST THE WAY YOU NEED Choose from: • Left eye • Right eye • Both eyes open Visual Vertical Lite is designed for quick, individual measurements, making it ideal when you simply need to perform a one-off SVV test. SIMPLE RESULTS Results are presented immediately in a clean, easy-to-read format, including the measured deviation and direction. BUILT-IN GUIDANCE Not familiar with the bucket method? The included guide walks you through equipment setup, positioning, testing and interpretation of the results. LITE OR FULL? Visual Vertical Lite includes the core functionality required to perform individual SVV tests. For sequential testing, multiple readings and automatic averaging across test conditions, choose the full Visual Vertical app. UPDATED FOR MODERN iOS Visual Vertical Lite has been comprehensively updated with a redesigned interface, clearer navigation and support for current versions of iOS.
K
This medical app helps healthcare professionals assess vestibular dysfunction by measuring balance stance metrics. It uses a device's accelerometer to objectively score balance after voice-guided exercises. Professionals can track patient progress over time.
- Vestibular dysfunction assessment
- Measures balance stance metrics
- Uses device accelerometer
- Objective balance scoring
- Longitudinal patient assessment
- Voice-guided exercises
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K-D Balance is an FDA-cleared app used by trained professionals — including athletic trainers and coaches, physical therapists, nurses, physicians, and other trained professionals . This app is intended only for users with an existing K-D Balance account. K-D Balance assesses three balance stances: double stance, right tandem stance and left tandem stance. To use K-D Balance, an iPhone or iPod touch is secured to the individual during the assessment. A hands-free, wearable device holder may be used to help stabilise the device. After step-by-step voice guidance for each stance, an objective balance score is automatically derived by detecting the individual's movements using the device's internal accelerometer. Trained professionals can compare an individual's K-D Balance assessments longitudinally.
Screenshots
Verdict
The clearest difference is price: K at Free against Visual Vertical Lite's $5.99. K also leads on rating (3.7 vs 2.0) and update cadence (every 3 months vs every 42 months). On ads, in-app purchases, 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
K is free to download; Visual Vertical Lite costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
K holds the better App Store score, 3.7 against 2.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
Visual Vertical Lite ships an update every 42 months, K every 3 months. The most recent releases landed on September 24, 2026 and September 8, 2026 respectively.
| Parameter | Visual Vertical Lite | K |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 2.0 (1 ratings) | 3.7 (3 ratings) — better |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 42 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 147 MB |
| Age rating | 4+ | 12+ |
| Developer | Clear Health Media | King-Devick Test, LLC |
Customer experience
Visual Vertical Lite
K
In-app purchases
Visual Vertical Lite
No in-app purchases
K
No in-app purchases









