528i vs ZeusOSA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
ZeusOSA
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ZeusOSA is a non-implantable, transcutaneous electrical nerve stimulation (TENS) medical device designed to be worn under the chin to alleviate symptoms of obstructive sleep apnoea (OSA) and improve sleep-disordered breathing. The device is intended for use by adult patients in the home environment during sleep. The lightweight, U-shaped silicone pad incorporates a disposable adhesive hydrogel electrode that delivers low-level transcutaneous electrical stimulation to the hypoglossal nerve through the skin. Stimulation of the hypoglossal nerve activates the genioglossus muscle, helping to maintain upper airway patency during sleep. Regular application of electrical stimulation promote genioglossus muscle activity, reducing the risk of throat vibrations and upper airway narrowing or collapse that can lead to snoring or episodes of apnoea and hypopnoea. The device is equipped with two buttons and contains an internal rechargeable battery. It provides ten different settings for the intensity of the electrical impulse, allowing for personalisation to meet individual user preferences. Trial participants can customise the stimulation intensity using the ‘+’ and ‘-’ buttons, resulting in a total of ten settings available. The built-in firmware of the ZeusOSA enables users to select their desired stimulation levels and incorporates a 20-minute delay to facilitate a smooth transition into sleep before stimulation commences. The ZeusOSA charger features a Bluetooth chip that allows access to usage data while the device is charging. The medical device cannot be worn during this time because it is charged via a USB cable (provided by the manufacturer) connected to a charging unit that engages pins on the underside of the device.
Screenshots
Verdict
528i and ZeusOSA are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 16, 2026 and September 29, 2026 respectively.
| Parameter | 528i | ZeusOSA |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Fortnightly | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 35 MB | 38 MB |
| Age rating | 17+ | 4+ |
| Developer | 528 INNOVATIONS LLC | Zeus Sleep Ltd |
In-app purchases
528i
No in-app purchases
ZeusOSA
No in-app purchases







