# K vs Vision Simulator

The clearest difference is in-app purchases: K at none against Vision Simulator's 1. K also leads on iOS requirement (8.0 vs 15.0). Vision Simulator'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.

Both are free to download. Vision Simulator sells 1 one-off in-app purchase. K asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for K against 5.0 for Vision Simulator. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

K ships an update every 14 months, Vision Simulator every 3 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | K | Vision Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/k-d-test-pro-reading/id1068456746/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/vision-simulator-eye-disease/id6772865195/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 3 days** |
| Monetization | **Free** | Paid |
| Size | 57 MB | 46 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [King-Devick Test, LLC](https://appshunter.io/developer/424793545) | [Ryan Evans](https://appshunter.io/developer/6772578354) |

## What reviewers say

### K

[App page](https://appshunter.io/ios/app/k-d-test-pro-reading/id1068456746)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### Vision Simulator

[App page](https://appshunter.io/ios/app/vision-simulator-eye-disease/id6772865195)

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.

**Highlights:** Simulates multiple vision conditions, Uses live camera or uploaded photos, Adjustable severity sliders, Side-by-side comparison mode, Built-in sample scenes, Offline functionality

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vision Simulator Pro | $4.99 | one-time |


## Frequently asked questions

### Is K free?

K is free to download, with no in-app purchases.

### Is Vision Simulator free?

Vision Simulator is free to download, with in-app purchases available.

### Which has better reviews, K or Vision Simulator?

K and Vision Simulator are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do K or Vision Simulator have ads?

Neither K nor Vision Simulator shows ads.

### Which is updated more often, K or Vision Simulator?

K ships an update every 14 months, and Vision Simulator every 3 days. Most recently, K was updated on November 2, 2026 and Vision Simulator on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*