K vs Vision Simulator by Dr. Evans
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
K
This application facilitates the administration of a rapid eye movement test for reading assessment. It compares performance against age-related norms for individuals aged 6-14+, helping to identify potential candidates for reading intervention programs.
- Reads numbers from test cards
- Measures speed and accuracy
- Compares results to age norms
- Identifies candidates for intervention
- Administered in under two minutes
- Validated by peer-reviewed studies
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The King-Devick Test involves reading aloud a series of single digit numbers from left to right on three test cards. Performance is based on speed and accuracy and results are instantly compared to age-related normative data for subjects 6-14+ years old. Testing administrators can quickly identify subjects that may be prime candidates for the King-Devick Reading Acceleration Program as an effective intervention. -Reliable: K-D Test has been extensively researched and validated by peer-reviewed studies -Quick: K-D Test Pro Reading can be easily administered in two minutes or less -Objective: Performance immediately compared to age-related normative data for subjects 6-14+ years old This app is intended ONLY for professional users with an existing K-D Test Pro Reading account.
Vision Simulator by Dr. Evans
Experience the world through the eyes of someone with various vision conditions. This tool uses your camera or photos to simulate effects like nearsightedness, astigmatism, cataracts, and glaucoma, aiding understanding for patients, students, and the curious. It offers adjustable severity and side-by-side comparisons.
- Simulates multiple vision conditions
- Uses live camera or uploaded photos
- Adjustable severity sliders
- Side-by-side comparison mode
- Built-in sample scenes
- Offline functionality
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Vision Simulator lets you see the world the way someone with a vision condition does. Built by an optometrist as a patient-education tool, it applies clinically-informed visual effects to your live camera or any photo. Point your camera at a room, a face, or an eye chart — then switch between conditions to understand how each one changes what a person sees. CONDITIONS SIMULATED • Myopia (nearsightedness) with Snellen acuity presets • Astigmatism with adjustable axis • Cataract — yellowing, glare, and contrast loss • Glaucoma — peripheral field loss by stage • Age-Related Macular Degeneration with metamorphopsia • Diabetic Retinopathy • Color Vision Deficiency (red, green, and blue types) • Floaters & Posterior Vitreous Detachment FEATURES • Live camera or upload your own image • Side-by-side Compare — drag to wipe between normal and impaired vision • Adjustable severity sliders for every condition • Built-in sample scenes: eye chart, Amsler grid, night street, color garden • Snapshot to save what you see • Plain-language clinical notes for each condition • Works offline · No ads · No data collected A powerful way for eye care professionals to explain conditions to patients and families, for students to learn, and for anyone curious about how vision changes. IMPORTANT: Vision Simulator is for educational demonstration only. It is not a diagnostic tool and is not a substitute for a professional eye examination. All images are processed on your device and are never stored or shared.
Screenshots
Verdict
The clearest difference is monetization model: K at free against Vision Simulator by Dr. Evans's paid. K also leads on iOS requirement (8.0 vs 13.0). Vision Simulator by Dr. Evans's advantage is update cadence (every 3 days vs every 14 months) and device support (3 vs 1). On price, rating, ratings volume 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for K against 5.0 for Vision Simulator by Dr. Evans. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
K ships an update every 14 months, Vision Simulator by Dr. Evans every 3 days. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.
| Parameter | K | Vision Simulator by Dr. Evans |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 14 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 57 MB | 19 MB |
| Age rating | 12+ | 4+ |
| Developer | King-Devick Test, LLC | Ryan Evans |
Customer experience
K
Vision Simulator by Dr. Evans
In-app purchases
K
No in-app purchases
Vision Simulator by Dr. Evans
No in-app purchases





