# OKN Drum: Optokinetic — Nystagmus & eye movement test

> Digital optokinetic drum for vision testing and exercises with customizable features. (iPhone/iPad app by My Call Bag LLC.)

- Source: https://appshunter.io/ios/app/okn-drum-optokinetic/id6474153180 (this page in markdown: same URL + `.md`)
- Developer: [My Call Bag LLC](https://appshunter.io/developer/1243282862)
- Category: Medical, Health & Fitness
- Price: Free with in-app purchases (on sale, was $4.99)
- Rating: 4.00/5 from 14 App Store ratings · 13 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 13 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2023-12-12
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/okn-drum-optokinetic/id6474153180/reviews.md

## What is OKN Drum?

IN-APP PURCHASE REQUIRED FOR USE
· OKN Drum Pro provides an Optokinetic Nystagmus (OKN) Drum featuring multiple modes for optokinetic testing and exercises. Users can adjust the stripe width to their preference using the pinch-to-zoom functionality. 
· The speed of the OKN stripes is easily adjustable, enabling quick increases or decreases as desired. 
· Users have the option to select either black or red stripes to suit their visual requirements. 
· Includes multiple pediatric targets, such as puppies, dinosaurs, and various animal targets. 
· By tapping the stripes, users can enter full-screen mode for an immersive experience. 
· A metronome is also available to assist with timing exercises, enhancing the overall utility of the app for therapeutic and testing purposes.
· Record eye movements with the front facing camera
· Upload images for a custom OKN drum
· Flick the OKN graphic to simulate rotating an OKN drum

## Key features

- Adjustable stripe width and speed
- Selectable black or red stripes
- Pediatric targets (puppies, dinosaurs, animals)
- Full-screen mode
- Integrated metronome
- Record eye movements with camera
- Upload custom images for drum

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Access | $4.99 | one-time |


## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/okn-drum-optokinetic/id6474153180/reviews.md

### 2/5 — Disappointed

*2026-06-11*

Purchased the in app purchase for the metronome sound and it doesn’t work. My sound and ringer was all the way up, my phone was not on silent and still not working.

### 1/5 — Inhalt nicht derselbe wie in der Beschreibung

*2026-03-13*

Leider ist in der Vorschau im App Store mehr vorhanden als in der heruntergeladenen App. Es fehlen die gelben und blauen Zielpunkte. Das war jedoch der Grund warum ich mich für diese App entschieden habe. Schade…

### 2/5 — Upside down dogs

*2026-01-08*

I really was liking this app for clinic to hold kids attention. But now the animals scroll upside down no mater what orientation I hold my iPad. I tried unlocking and locking the screen orientation but it did not fix the issue. Frustrating. I wish the developer would fix this glitch.

### 5/5 — Great rehab tool

*2025-12-06*

This is fantastic as a tool for vestibular rehab! Is there a way to make it a 360 immersive video version—where it looks like you are in an optokinetic drum (compatible with a phone VR headset) to use for patients with MdDs?

### 1/5 — Not smooth

*2025-10-10*

The flow is not smooth at all very jerky like it is glitching. This does not function as it should. The metronome doesn’t work. I can’t change the direction of flow. I’d like a refund

### 1/5 — Glitches

*2024-11-13*

It would be so great but it glitches, causing it to not be a smooth transition of the lines, which feels like it isn’t helping with the vertigo like it should because my brain is trying to figure out the glitching.

### 1/5 — schade

*2024-10-13*

leider läuft die gekaufte app version nicht auf meinem macbook air, wie angegeben

### 2/5 — Not all features are here mentioned

*2024-05-11*

The video shows a dot for gaze stabilisation, but this app doesn't have that feature.

### 4/5 — Just the ticket for MddS

*2024-01-03*

Just what I was looking for to try and combat my MddS.
BUT - could an option please be added to change the stripe direction? And to have the app be full screen in landscape mode for my iPad?

**Developer response:** Thank you for the feedback. To change the direction of the stripes you just have to rotate your device. The orientation should be locked to make this convenient for you. Please email me at mullman@gmail.com if this doesn’t work for you. I will try to incorporate a fix for you!

### 5/5 — Awesome!

*2023-12-13*

My favorite OKN drum app! Great fixation target feature.

## Frequently asked questions about OKN Drum

### What is OKN Drum used for?

OKN Drum is used for optokinetic nystagmus (OKN) testing and exercises. It helps in assessing and training eye movements through customizable visual stimuli.

### How can I customize the OKN Drum?

You can customize the stripe width using pinch-to-zoom, adjust the speed of the stripes, and select between black or red stripe colors to suit your visual needs.

### Does OKN Drum have options for children?

Yes, OKN Drum includes multiple pediatric targets such as puppies, dinosaurs, and various animal figures to make testing and exercises more engaging for children.

### Can I record eye movements with OKN Drum?

Yes, the app allows you to record eye movements using the front-facing camera, which can be useful for tracking progress or for diagnostic purposes.

### What is the price of OKN Drum?

OKN Drum is a paid app, priced at $4.99. This one-time purchase grants you access to all its features.

### Is OKN Drum available on multiple devices?

Yes, OKN Drum is supported on both iPhone and iPad, offering flexibility for users across different Apple devices.

### How often is OKN Drum updated?

The app was last updated on February 8, 2026, with version 3.2. This indicates a recent update, suggesting ongoing support and potential for future improvements.

### Does OKN Drum have ads?

No, OKN Drum does not contain advertisements. As a paid application, it provides an ad-free experience for users.

## Version history (last 5 releases)

### 3.7 — 2026-06-24

Bug fixes.

### 3.6 — 2026-05-07

Bug fixes

### 3.5 — 2026-05-01

Improved eye recording
Custom colors

### 3.4 — 2026-04-02

Improved on-boarding

### 3.3 — 2026-04-02

Improved onboarding

## Apps similar to OKN Drum

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [OKN Viewer: Nystagmus](https://appshunter.io/ios/app/okn-viewer-nystagmus/id6695726882) | 5.0 (2) | $1.99 | Medical |
| [Smart Optometry](https://appshunter.io/ios/app/smart-optometry/id1053891266) | 4.4 (529) | Free | Medical |
| [Visual Vertical](https://appshunter.io/ios/app/visual-vertical/id419017746) | 2.0 (5) | $11.99 | Medical |
| [RITP](https://appshunter.io/ios/app/ritp/id6444898938) | 4.8 (12) | Free | Medical |
| [NowYouKnowMed](https://appshunter.io/ios/app/nowyouknowmed/id6648798784) | 4.5 (8) | Free | Medical |
| [Focus Builder Pro](https://appshunter.io/ios/app/focus-builder-pro/id6751810825) | 5.0 (1) | Free | Medical |

## More apps by My Call Bag LLC

- [Ullman Indirect](https://appshunter.io/ios/app/ullman-indirect/id1243282866)
- [Eye Chart Watch App](https://appshunter.io/ios/app/eye-chart-watch-app/id6468593868)
- [My Call Bag: Eye & Neurology](https://appshunter.io/ios/app/my-call-bag-eye-and-neurology/id6471442410)
- [Scoville Heater Meter](https://appshunter.io/ios/app/scoville-heater-meter/id6473058296)
- [眼图](https://appshunter.io/ios/app/id6473678056)

All apps by My Call Bag LLC: https://appshunter.io/developer/1243282862

## Related topics

[optokinetic](https://appshunter.io/ios/topics/optokinetic) · [arkit drum](https://appshunter.io/ios/topics/arkit-drum)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*