OKN Drum Downloads & RevenueOKN Drum: Optokinetic · App Store
OKN Drum: Optokinetic is #33 in Medical Grossing in South Korea and charting in 1 of 30 countries we track.
Updated 11 Nov 2026 · rankings refresh through the day
DeveloperMy Call Bag LLC
CategoryMedical
PriceFree
Released
Rating★ 5.0 (3)
Version4.0
Age rating4+
First seen by us
25 Sep 2026
25 Sep 2026Installs (est.)1k+ worldwide
OKN Drum: Optokinetic update history & changes
Last change · 19 events since 12 Dec 2023Full timeline ↓📈Entered the top 100📈Charting in a new country📦Updated to version 4.0📦Version 3.9🆕First spotted by AppInsider🆕Its developer released another app: Laryngoscope Simulator 3D
Full timeline · 19 events
- 📈OKN Drum: Optokinetic entered the top 100Top Grossing · Medical · AU
- 📈OKN Drum: Optokinetic charting in a new countryAustralia
- 📈OKN Drum: Optokinetic entered the top 100Top Grossing · Medical · JP
- 📈OKN Drum: Optokinetic charting in a new countryJapan
- 📈OKN Drum: Optokinetic entered the top 100Top Grossing · Medical · KR
- 📈OKN Drum: Optokinetic charting in a new countrySouth Korea
- 📈OKN Drum: Optokinetic entered the top 100 in 2 chartsTop Grossing · Medical · FR · Top Grossing · Medical · SA
- 📈OKN Drum: Optokinetic charting in a new countryFrance
- ✏️OKN Drum: Optokinetic added 9 languages+ AR + FA + HI + ID + MS + NL + RU + TR + VI
- 📈OKN Drum: Optokinetic charting in a new countrySaudi Arabia
- 📦OKN Drum: Optokinetic updated to version 4.0Now with eye tracking! Graph eye movements.
Bug fixes and iPhone Duo Compatibility - 📈OKN Drum: Optokinetic entered the top 100Top Grossing · Medical · CN
- 📈OKN Drum: Optokinetic charting in a new countryChina
- 📦OKN Drum: Optokinetic version 3.9Bug fixes
- 🆕OKN Drum: Optokinetic first spotted by AppInsider#80 in Top Grossing · Medical · India
- 🆕OKN Drum: Optokinetic: its developer released another app: Laryngoscope Simulator 3D
- 🆕OKN Drum: Optokinetic: its developer released another app: Subjective Visual Vertical SVV
- 🆕OKN Drum: Optokinetic: its developer released another app: Optics Simulator - Ray Diagram
- 🆕OKN Drum: Optokinetic released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
5.0 ★
3 ratings
Measured
Best rank now
#33
Medical GrossingMeasured
OKN Drum: Optokinetic on the App Store
App details
App ID
6474153180
Publisher
My Call Bag LLC
On the store since
Dec 2023
2 years on the store
Minimum OS
iOS 17.0+
iPhone XS and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
19
AR NL EN FR DE HI ID IT JA KO MS FA …
Size
14 MB
Also listed in
Health & Fitness
OKN Drum: Optokinetic downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| South Korea | MedicalGrossing | #33 |
Apps near OKN Drum: Optokinetic on the chart
Medical Grossing, around #33.
Ratings
App Store, worldwide.
Rating
5.0 ★
3 ratings
Measured
Ratings
3
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
under 1
4-week average
Lifetime rating
4.0★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
20/100
faster than 0% of Medical apps
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
About OKN Drum: Optokinetic
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.
· Graph eye movements with pupil tracking
· 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.
· 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.
· Graph eye movements with pupil tracking
· 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.
Latest updates
4.0
Now with eye tracking! Graph eye movements.
Bug fixes and iPhone Duo Compatibility
3.9
Bug fixes
Store changes
What OKN Drum: Optokinetic changed on its store page: name, icon, screenshots, price, size, languages, requirements.
Added 9 languages
+ AR + FA + HI + ID + MS + NL + RU + TR + VI
