# OKNDrum vs optaro

The clearest difference is price: optaro at Free against OKNDrum's $3.99. OKNDrum's advantage is update cadence (every 3 weeks vs every 3 months) and device support (3 vs 1). On ads and in-app purchases there is nothing between them.

optaro is free to download; OKNDrum costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OKNDrum ships an update every 3 weeks, optaro every 3 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | OKNDrum | optaro |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.7 (144 ratings)](https://appshunter.io/ios/app/okndrum-optokinetic-drum/id1438597800/reviews)** | — |
| Number of ratings | **144** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Paid | — |
| Size | 8 MB | 54 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Angel Vazquez](https://appshunter.io/developer/1133273955) | [Eschenbach Optik GmbH](https://appshunter.io/developer/1759178360) |

## What reviewers say

### OKNDrum

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

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


### optaro

[App page](https://appshunter.io/ios/app/optaro/id6572303552)

**In-app purchases:** none


## Frequently asked questions

### Is OKNDrum free?

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

### Is optaro free?

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

### Do OKNDrum or optaro have ads?

Neither OKNDrum nor optaro shows ads.

### Which is updated more often, OKNDrum or optaro?

OKNDrum ships an update every 3 weeks, and optaro every 3 months. Most recently, OKNDrum was updated on October 29, 2026 and optaro on October 27, 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.*