Comparison

OKN Drum vs 528i

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

528i

This app guides users through laser therapy sessions with step-by-step instructions and instructional videos. It connects to a laser device to optimize timing, frequency, and application for photobiomodulation and low-level laser therapy.

Highlights
  • Step-by-step smart guidance
  • Interactive instructional videos
  • Wavelength recommendations
  • Device connectivity
  • Precision wellness at home
Read full description

528i – Smart Laser Therapy, Simplified Take the guesswork out of light therapy with the 528i Mobile App—your interactive guide for clinical-grade precision wellness at home. Designed to pair with the 5i Series Laser Therapy System, the app delivers real-time support and step-by-step guidance to maximize the benefits of photobiomodulation (PBM) and low-level laser therapy (LLLT). Features: * Smart Guidance: Follow clear, step-by-step instructions for optimal timing, frequency, and targeted laser application. * Interactive Support: Access instructional videos and guided therapy techniques tailored to your program. * Wavelength Insights: Explore a full list of recommended wavelengths for each preset and program to enhance therapy results. * Device Connectivity: Sync effortlessly with your 528i laser device for a fully integrated experience. The 5i Series system is FDA-cleared in the United States. The 5i Series system features clinical-grade Class 3R laser technology designed for safe, effective use in the comfort of your home. Proven benefits include relief from pain, improved blood circulation, reduced inflammation, and muscle relaxation. Whether you’re new to light therapy or seeking advanced precision, the 528i app empowers your wellness journey with clarity, confidence, and results. DISCLAIMER: This application is intended for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always seek the guidance of your physician or other qualified health provider with any questions you may have regarding a medical condition. Do not disregard professional medical advice or delay in seeking it because of information provided by this app.

Screenshots

OKN Drum4 screens
528i4 screens

Verdict

The call

The clearest difference is rating: 528i at 5.0 against OKN Drum's 4.1. 528i also leads on in-app purchases (none vs 1) and iOS requirement (14.0.0 vs 17.0). OKN Drum's advantage is ratings volume (16 vs 3). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OKN Drum sells 1 one-off in-app purchase. 528i asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

528i holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: OKN Drum has 16 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

OKN Drum ships an update every 2 weeks, 528i fortnightly. The most recent releases landed on October 27, 2026 and October 16, 2026 respectively.

Scorecard5 real differences · 5 level
OKN Drum versus 528i: the parameters behind the verdict, then further details
ParameterOKN Drum528i
PriceFreeFree
Rating4.1 (16 ratings)5.0 (3 ratings) — better
Positive reviews46.2% of reviews—
Number of ratings16 — better3
Update frequencyEvery 2 weeksFortnightly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.014.0.0 — better
Further details — not scored
Size14 MB35 MB
Age rating4+17+
DeveloperMy Call Bag LLC528 INNOVATIONS LLC

Customer experience

OKN Drum

All ratings16 ratings
Positive68.8%
Neutral12.5%
Negative18.8%
Written reviews13 reviews
Positive46.2%
Neutral0.0%
Negative53.8%

528i

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

OKN Drum

One-time1
  • Lifetime Access$4.99
None

528i

No in-app purchases

Questions

Is OKN Drum free?
OKN Drum is free to download, with in-app purchases available.
Is 528i free?
528i is free to download, with no in-app purchases.
Which has better reviews, OKN Drum or 528i?
528i is rated higher. OKN Drum averages 4.1 out of 5 from 16 ratings, while 528i averages 5.0 from 3 ratings.
Do OKN Drum or 528i have ads?
Neither OKN Drum nor 528i shows ads.
Which is updated more often, OKN Drum or 528i?
OKN Drum ships an update every 2 weeks, and 528i fortnightly. Most recently, OKN Drum was updated on October 27, 2026 and 528i on October 16, 2026.

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