Comparison

528i vs ZeusOSA

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

Head to head
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.

About

ZeusOSA

Features
Read full description

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

528i4 screens
ZeusOSA4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 16, 2026 and September 29, 2026 respectively.

ScorecardNo meaningful differences
528i versus ZeusOSA: the parameters behind the verdict, then further details
Parameter528iZeusOSA
PriceFreeFree
Rating5.0 (3 ratings) — better—
Number of ratings3 — better—
Update frequencyFortnightlyFortnightly
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS14.0.0 — better15.1
Further details — not scored
Size35 MB38 MB
Age rating17+4+
Developer528 INNOVATIONS LLCZeus Sleep Ltd

In-app purchases

None

528i

No in-app purchases

None

ZeusOSA

No in-app purchases

Questions

Is 528i free?
528i is free to download, with no in-app purchases.
Is ZeusOSA free?
ZeusOSA is free to download, with no in-app purchases.
Do 528i or ZeusOSA have ads?
Neither 528i nor ZeusOSA shows ads.
Which is updated more often, 528i or ZeusOSA?
528i ships an update fortnightly, and ZeusOSA fortnightly. Most recently, 528i was updated on October 16, 2026 and ZeusOSA on September 29, 2026.

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