OKN Strips vs MDS Events
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OKN Strips
This diagnostic and therapeutic app aids in evaluating neurological, otological, and ophthalmological disorders. It features moving strips to elicit nystagmus, a red desaturation test, and an Amsler grid for comprehensive eye examinations.
- Optokinetic Nystagmus (OKN) elicitation
- Red Desaturation test
- Amsler Grid for eye testing
- Adjustable strip speed, color, and width
- Reverse strip direction
- Toolbar hide/show functionality
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Top selling diagnostic and therapeutic app for iPad, iPhone and iPod Touch! OKN Strips can be used to elicit Optokinetic Nystagmus (OKN) for evaluation of neurological, otological or opthalmological disorders, includes a Red Desaturation mode and now has an Amsler grid for additional eye testing. OKN Strips: Tap the screen to cycle through speeds of the moving strips. Tap the strips icon in the bottom toolbar to toggle the color of the strips between Red and Black. Pinch or Zoom with two fingers to change the width of the strips. Swipe against the direction the strips are moving to reverse their direction. Tap the screen with two fingers to hide or show the bottom toolbar. On the right side of the bottom toolbar there's icons to open the Red Desaturation and Amsler Grid. Red Desaturation: Use the colored circle to perform a red desaturation test. Amsler Grid: Use the Amsler grid to perform eye tests. The buttons on the bottom toolbar change color combinations of the grid.
MDS Events
Access comprehensive information for medical congresses, including sessions, speaker details, and exhibitor listings. Stay updated on the International Congress of Parkinson’s Disease and Movement Disorders® and other regional events.
- Event session access
- Speaker information
- Exhibitor listings
- Regional event updates
- Congress networking
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Download the MDS Events app to access sessions, events, speaker information, exhibitors and more for the International Congress of Parkinson’s Disease and Movement Disorders® and other regional MDS medical events.
Screenshots
Verdict
OKN Strips and MDS Events both sit at 4.6 stars, but that hides the real split: 62% of OKN Strips's written reviews are positive against 0% of MDS Events's. OKN Strips also leads on update cadence (every 3 months vs every 12 months) and chart position (#88 vs unranked). MDS Events's advantage is price (Free vs $3.99). On rating, ads, in-app purchases 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
MDS Events is free to download; OKN Strips costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.6 for OKN Strips against 4.5 for MDS Events. That said, the two scores are not equally well evidenced: OKN Strips has 587 ratings behind it against 104, so its average is the more settled of the two. Written reviews are what separate them: 62% of OKN Strips's written reviews are positive against 0% of MDS Events's.
OKN Strips ships an update every 3 months, MDS Events every 12 months. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.
| Parameter | OKN Strips | MDS Events |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.6 (587 ratings) — better | 4.5 (104 ratings) |
| Positive reviews | 61.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 587 — better | 104 |
| Update frequency | Every 3 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #88 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 7 MB | 109 MB |
| Age rating | 4+ | 12+ |
| Developer | Thomas Alvarez | Movement Disorder Society |
Customer experience
OKN Strips
MDS Events
Bugs and requests
OKN Strips
Reported bugs
3 issues- Red desaturation test color doesn't change
- Red-Black inversion doesn't work on grid test
- Cannot go back to menu from OKN strips without restarting app
Requested features
8 requests- Recording feature
- Adjustable speed and style
- Change direction of movement (left/right, up/down)
- Options for smooth pursuit, saccades, VOR
- Horizontal stripes option
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- More peer-reviewed studies
- Make technology better known
- Slower speed option
MDS Events
Not enough reviews yet to summarise bugs or requests.
In-app purchases
OKN Strips
No in-app purchases
MDS Events
No in-app purchases
