Vision Toolbox vs K
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Vision Toolbox
This application provides eye care professionals with over 500 digital test screens and images for vision assessment and screening. It offers a comprehensive suite of tools for near vision, distance vision, patient education, and dispensing, all accessible on an iPad.
- Over 500 test screens and images
- Near vision assessment tools
- 3-meter distance vision assessment
- Patient education images and videos
- Digital dispensing tools
- On-screen rulers and protractors
- Eye-related calculation toolkit
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Thomson Software Solutions is the leading provider of software for eye care professionals in Europe and has users all over the world. This application joins a family of software for vision assessment and screening originally devised by Professor David Thomson. Replace all your test types, near charts, near testing units etc. with over 500 test screens and images in one slick application. The Vision Toolbox exploits the superb graphics capabilities of the iPad to provide a huge range of vision assessment tools for eye care professionals (ophthalmologists, optometrists, orthoptists and opticians). Access different tests by simply rotating the iPad and view variations by swiping the screen. Select the test that you want directly by viewing the thumbnail gallery and draw on the screen using your finger. Pan and zoom some of the images or display as a slide show. No eye care professional can afford to be without it! The tools are divided into five categories: Near vision assessment: By holding the iPad at a normal reading distance, The Vision Toolbox can be used to assess a wide range of near vision functions including: - Test types (Adult and children's test types) - LogMAR reading test - LogMAR near charts - Task images (Maps, books, newspaper etc. to ensure the patient can perform these real world tasks) - Binocular vision tests (fixation disparity, binocularity, suppression, stereopsis, 3D red/green anaglyphs) - Duochrome (dots, letters, rings) - Amsler (positive and negative contrast, draw directly on charts and email the results) - Fixation targets (clown, crosses, letters, cartoons) - Miscellaneous (convergence, astigmatism, Maddox rod) 3 metre assessment: View Vision Toolbox from 3 metres and you can assess a wide range of distance vision functions. Handy for home visits, vision screening or testing children. - LogMAR charts - Snellen charts - Single letter charts - Children's visual acuity (Tumbling Es, linear logMAR) - Duochrome (dots, letters, rings) - Cross cylinder (dots and rings) - UK number plate test for driving (actual number plate fonts and correct spacing) - Fixation targets (clown slide show to use during retinoscopy for example) Patient information: Wide range of images to help explain conditions to patients. Select the required image from a thumbnail gallery. Pan and zoom on all images and draw with your finger. - Eye diagrams - Eye disease (photographs of a wide range of anterior segment eye diseases) - Front of the eye (images of the external eye) - Retina (normal and abnormal fundi) - Dispensing images - Videos Dispensing tools: Replace your frame rule with a selection of on-screen rulers, protractors etc. Take advantage of the back-illuminated screen to measure CDs, bifocal heights, varifocals etc. Toolkit: Use the toolkit to perform those tricky eye-related calculations. - Visual acuity (convert between LogMAR, VAR, Snellen metres, Snellen ft, Resolution and Spatial frequency) - LogMAR scorer (help with scoring a LogMAR chart) - Vertex distance calculator - Toric contact lens over-refraction calculator - Transposition calculator
K
This application helps clinicians monitor and track the progression of Age-Related Macular Degeneration (AMD). It can be used by patients for home screening, with results remotely monitored by clinical staff. Early detection of wet AMD is crucial for timely treatment.
- Monitor AMD progression
- Track dry to wet AMD
- Home screening tool
- Remote monitoring by clinicians
- Early detection of wet AMD
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King-Devick Variable Color Contrast Sensitivity Chart is an iPad/iPhone-based product application that allows clinicians to monitor and track the progression of Age-Related Macular Degeneration (AMD) from non-exudative (dry) AMD to exudative (wet) AMD. It is critical to know when exudative (wet) AMD begins to occur so the treatment with a-VEGF injections can begin. King-Devick Variable Color Contrast Sensitivity Chart has been proven to be a helpful tool in detecting progression of disease in Age-Related Macular Degeneration. King-Devick Variable Contrast Sensitivity Chart can be used by the patient as a simple home-screening tool monitored by clinician’s staff remotely or in-office screening. Our Terms of Use are available here https://kingdevicktest.com/terms-of-service/
Screenshots
Verdict
The clearest difference is price: K at Free against Vision Toolbox's $59.99. K also leads on rating (5.0 vs 1.0) and device support (3 vs 1). Vision Toolbox's advantage is in-app purchases (none vs 1). On ratings volume, 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
K is free to download; Vision Toolbox costs $59.99 up front. K sells 1 in-app purchase, starting at $51.99 per year. Vision Toolbox asks for nothing beyond the download.
K holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Vision Toolbox ships an update every 34 months, K every 32 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | Vision Toolbox | K |
|---|---|---|
| Price | $59.99 | Free — better |
| Rating | 1.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 37.5% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 34 months | Every 32 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 8.0 — better |
| Further details — not scored | ||
| Size | 579 MB | 64 MB |
| Age rating | 17+ | 12+ |
| Developer | Potters Bar Eye Care Limited | King-Devick Test, LLC |
Customer experience
Vision Toolbox
K
In-app purchases
Vision Toolbox
No in-app purchases
K
- Annual Subscription$51.991 Year









