# Visual Attention Therapy Lite vs Ratio S/Z

The clearest difference is price: Visual Attention Therapy Lite at Free against Ratio S/Z's $2.99. Visual Attention Therapy Lite also leads on iOS requirement (9.0 vs 11.0). Ratio S/Z's advantage is update cadence (every 3 months vs every 9 months) and chart position (#196 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Visual Attention Therapy Lite is free to download; Ratio S/Z costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Visual Attention Therapy Lite ships an update every 9 months, Ratio S/Z every 3 months. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Visual Attention Therapy Lite | Ratio S/Z |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.7 (719 ratings)](https://appshunter.io/ios/app/visual-attention-therapy-lite/id554546572/reviews)** | — |
| Number of ratings | **719** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | Free | — |
| Best chart rank | — | **#196** |
| Size | 12 MB | 25 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Tactus Therapy Solutions Ltd.](https://appshunter.io/developer/438070002) | [Marina Sauca](https://appshunter.io/developer/1207544243) |

## What reviewers say

### Visual Attention Therapy Lite

[App page](https://appshunter.io/ios/app/visual-attention-therapy-lite/id554546572)

This app helps individuals with brain injuries, strokes, or attention deficits improve their scanning abilities and cognitive skills. It offers timed exercises and automated scoring to track progress in areas like reading, concentration, and processing speed.

**Highlights:** Improve scanning abilities, Assess for neglect, Practice left-to-right scanning, Timed exercises, Automated scoring and reports, Customizable layouts and difficulty

**In-app purchases:** none

**What reviewers like**

- 👍 Great for vision therapy
- 👍 Helpful for stroke survivors
- 👍 Good for focus and attention
- 👍 Useful for hemispheric neglect
- 👍 Customizable difficulty

**What reviewers complain about**

- 👎 Lite version is limited
- 👎 Free version is garbage
- 👎 No flow between tests

**Requested features**

- Allow users to go to the next test without returning home
- Larger font for geriatric patients


### Ratio S/Z

[App page](https://appshunter.io/ios/app/ratio-sz/id1207544244)

**Currently charting:** #196 Top Paid · Medical (US App Store)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Visual Attention Therapy Lite free?

Visual Attention Therapy Lite is free to download, with no in-app purchases.

### Is Ratio S/Z free?

Ratio S/Z costs $2.99, with no in-app purchases.

### Do Visual Attention Therapy Lite or Ratio S/Z have ads?

Neither Visual Attention Therapy Lite nor Ratio S/Z shows ads.

### Which is updated more often, Visual Attention Therapy Lite or Ratio S/Z?

Visual Attention Therapy Lite ships an update every 9 months, and Ratio S/Z every 3 months. Most recently, Visual Attention Therapy Lite was updated on November 1, 2026 and Ratio S/Z on October 29, 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.*