OptoDrum vs 528i
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
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.
- Step-by-step smart guidance
- Interactive instructional videos
- Wavelength recommendations
- Device connectivity
- Precision wellness at home
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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
Verdict
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
528i is free to download; OptoDrum costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
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.
OptoDrum ships an update every 3 months, 528i fortnightly. The most recent releases landed on September 10, 2026 and June 1, 2026 respectively.
| Parameter | OptoDrum | 528i |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 2.3 (18 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 30.4% of reviews | — |
| Number of ratings | 18 — better | 3 |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #150 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 14.0.0 |
| Further details — not scored | ||
| Size | 2 MB | 35 MB |
| Age rating | 4+ | 17+ |
| Developer | Linsay Associates, LLC | 528 INNOVATIONS LLC |
Customer experience
OptoDrum
528i
In-app purchases
OptoDrum
No in-app purchases
528i
No in-app purchases






