# Visual Vertical vs OKNDrum

The clearest difference is review sentiment: Visual Vertical at 100% against OKNDrum's 50%. OKNDrum's advantage is rating (4.7 vs 2.0) and price ($3.99 vs $11.99). On ads, in-app purchases and monetization model there is nothing between them.

Visual Vertical costs $11.99 and OKNDrum $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OKNDrum holds the better App Store score, 4.7 against 2.0. That said, the two scores are not equally well evidenced: OKNDrum has 142 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 100% of Visual Vertical's written reviews are positive against 50% of OKNDrum's, so the app with the better star average is not the one people write more warmly about.

Visual Vertical ships an update every 38 months, OKNDrum every 3 weeks. The most recent releases landed on October 5, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Visual Vertical | OKNDrum |
| --- | --- | --- |
| Price | $11.99 | **$3.99** |
| Rating | [2.0 (5 ratings)](https://appshunter.io/ios/app/visual-vertical/id419017746/reviews) | **[4.7 (142 ratings)](https://appshunter.io/ios/app/okndrum-optokinetic-drum/id1438597800/reviews)** |
| Number of ratings | 5 | **142** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#105** |
| Size | 10 MB | 8 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Clear Health Media](https://appshunter.io/developer/419017749) | [Angel Vazquez](https://appshunter.io/developer/1133273955) |

## What reviewers say

### Visual Vertical

[App page](https://appshunter.io/ios/app/visual-vertical/id419017746)

This medical app offers a quick, accurate, and low-cost method for measuring subjective visual vertical. It's designed for neurologists and vestibular rehabilitation specialists to test patients, especially for brainstem lesions and otolithic function, using just an iPhone or iPad.

**Highlights:** Measure subjective visual vertical, Accurate and low-cost testing, Suitable for neurology and vestibular rehab, Tests for brainstem lesions, Evaluates otolithic function, Multiple readings and averaged results, Single, one-off readings

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

**In-app purchases:** none


### OKNDrum

[App page](https://appshunter.io/ios/app/okndrum-optokinetic-drum/id1438597800)

**Currently charting:** #105 Top Paid · Medical (US App Store)

This app provides a digital alternative to a physical optokinetic drum for evaluating neurological, otological, and ophthalmological disorders. It allows for easy adjustment of stripe color, width, speed, and direction, making it a convenient tool for medical professionals.

**Highlights:** Digital optokinetic drum replacement, Evaluates neurological, otological, ophthalmological disorders, Adjustable stripe color, width, speed, direction, 7 scrolling speeds, Red or black stripe colors, Easy-to-hide menu

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

**In-app purchases:** none


## Frequently asked questions

### Is Visual Vertical free?

Visual Vertical costs $11.99, with no in-app purchases.

### Is OKNDrum free?

OKNDrum costs $3.99, with no in-app purchases.

### Which has better reviews, Visual Vertical or OKNDrum?

OKNDrum is rated higher. Visual Vertical averages 2.0 out of 5 from 5 ratings, while OKNDrum averages 4.7 from 142 ratings.

### Do Visual Vertical or OKNDrum have ads?

Neither Visual Vertical nor OKNDrum shows ads.

### Which is updated more often, Visual Vertical or OKNDrum?

Visual Vertical ships an update every 38 months, and OKNDrum every 3 weeks. Most recently, Visual Vertical was updated on October 5, 2026 and OKNDrum on October 17, 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.*