Comparison

OptoDrum vs 528i

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

Head to head
About

OptoDrum

This medical tool offers a digital alternative to traditional optokinetic drums for assessing neurological, otological, and ophthalmological conditions. It allows for easy adjustment of patterns, speed, and width, making it a convenient option for clinical use.

Highlights
  • Digital replacement for optokinetic drums
  • Adjustable stripe patterns, width, and speed
  • Five pattern types: stripes, colors, symbols, animals
  • Intuitive touch controls for speed and stopping
  • Pinch-to-zoom for pattern width adjustment
Features
Currently charting
Read full description

OptoDrum is an easy to use replacement for a bulky optokinetic drum or a fraying cloth tape to elicit optokinetic nystagmus for evaluation of neurological, otological, and opthalmological disorders.   Simply place the iPhone with a moving pattern in front of a patient’s eye to elicit the response.  The stripe pattern, width, and speed are easily adjustable. • OptoDrum provides five patterns: black stripes, red stripes, mixed colors, symbols, and animals. • Drag a finger up or down the screen to make the pattern move at the speed of your finger. • Double tap the moving pattern to make it stop. • Pinch or zoom the pattern with two fingers to narrow or widen the pattern. • A left or right finger swipe switches a stopped pattern to the next one in rotation.

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

OptoDrum1 screens
528i4 screens

Verdict

The call

The clearest difference is price: 528i at Free against OptoDrum's $4.99. 528i also leads on rating (5.0 vs 2.3) and update cadence (fortnightly vs every 3 months). OptoDrum's advantage is chart position (#150 vs unranked) and ratings volume (18 vs 3). On 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

CostPrice · In-app purchases · Ads · Monetization

528i is free to download; OptoDrum costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

528i holds the better App Store score, 5.0 against 2.3. That said, the two scores are not equally well evidenced: OptoDrum has 18 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

OptoDrum ships an update every 3 months, 528i fortnightly. The most recent releases landed on September 10, 2026 and June 1, 2026 respectively.

Scorecard7 real differences · 4 level
OptoDrum versus 528i: the parameters behind the verdict, then further details
ParameterOptoDrum528i
Price$4.99Free — better
Rating2.3 (18 ratings)5.0 (3 ratings) — better
Positive reviews30.4% of reviews—
Number of ratings18 — better3
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#150 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better14.0.0
Further details — not scored
Size2 MB35 MB
Age rating4+17+
DeveloperLinsay Associates, LLC528 INNOVATIONS LLC

Customer experience

OptoDrum

All ratings18 ratings
Positive27.8%
Neutral11.1%
Negative61.1%
Written reviews23 reviews
Positive30.4%
Neutral8.7%
Negative60.9%

528i

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

In-app purchases

None

OptoDrum

No in-app purchases

None

528i

No in-app purchases

Questions

Is OptoDrum free?
OptoDrum costs $4.99, with no in-app purchases.
Is 528i free?
528i is free to download, with no in-app purchases.
Which has better reviews, OptoDrum or 528i?
528i is rated higher. OptoDrum averages 2.3 out of 5 from 18 ratings, while 528i averages 5.0 from 3 ratings.
Do OptoDrum or 528i have ads?
Neither OptoDrum nor 528i shows ads.
Which is updated more often, OptoDrum or 528i?
OptoDrum ships an update every 3 months, and 528i fortnightly. Most recently, OptoDrum was updated on September 10, 2026 and 528i on June 1, 2026.

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