# 528i vs ZeusOSA

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.

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.

## The numbers

| Metric | 528i | ZeusOSA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/528i/id6738430099/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free | — |
| Size | 35 MB | 38 MB |
| Requires iOS | **14.0.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [528 INNOVATIONS LLC](https://appshunter.io/developer/1780816602) | [Zeus Sleep Ltd](https://appshunter.io/developer/1811358859) |

## What reviewers say

### 528i

[App page](https://appshunter.io/ios/app/528i/id6738430099)

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

**In-app purchases:** none


### ZeusOSA

[App page](https://appshunter.io/ios/app/zeusosa/id6771698018)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*