vHIT96da vs OKN Drum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
vHIT96da
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This application enables video head impulse testing (vHIT) using an iPhone. A dedicated fixation device is attached to the iPhone and held in place by the subject biting on the mouthpiece. The 3D design data for this fixation device are available on the developer’s website. The application records eye movements using high-speed video capture and analyzes the recorded video to generate graphs of eye movement. Simultaneously, motion sensor data from the iPhone are acquired and used to generate graphs of head movement. The analysis results can be saved as image files. These saved images can also be attached to and sent via email. This application and fixation device have been used in research studies approved by an institutional ethics committee in Japan. They are intended for research purposes only and must not be used for clinical diagnosis or treatment.
OKN Drum
This app offers a digital optokinetic drum for vision testing and exercises. Customize stripe width, speed, and color, with options for pediatric targets. It also features a metronome and camera recording for eye movements.
- 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
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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 This app is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare provider before making any medical decisions. If you think you may have a medical emergency, call emergency services immediately.
Screenshots
Verdict
The clearest difference is in-app purchases: vHIT96da at none against OKN Drum's 1. vHIT96da also leads on iOS requirement (15.6 vs 17.0). On price, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. OKN Drum sells 1 one-off in-app purchase. vHIT96da asks for nothing beyond the download.
vHIT96da ships an update every 11 days, OKN Drum every 9 days. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.
| Parameter | vHIT96da | OKN Drum |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.1 (16 ratings) — better |
| Positive reviews | — | 46.2% of reviews |
| Number of ratings | — | 16 — better |
| Update frequency | Every 11 days | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Paid |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 5 MB | 13 MB |
| Age rating | 12+ | 4+ |
| Developer | Kuroda ENT Clinic | My Call Bag LLC |
In-app purchases
vHIT96da
No in-app purchases
OKN Drum
- Lifetime Access$4.99








