# imOS STYLE vs HYDROS App

The clearest difference is update cadence: HYDROS App at every 3 months against imOS STYLE's every 20 months. imOS STYLE's advantage is iOS requirement (8.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

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

imOS STYLE ships an update every 20 months, HYDROS App every 3 months. The most recent releases landed on October 7, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | imOS STYLE | HYDROS App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.6 (23 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews)** |
| Number of ratings | — | **23** |
| Positive reviews | — | 62.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 11 MB | 70 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [illumagic](https://appshunter.io/developer/1139644730) | [Coralvue](https://appshunter.io/developer/1455344293) |

## What reviewers say

### imOS STYLE

[App page](https://appshunter.io/ios/app/imos-style/id1185423536)

**Features:** macOS Compatibility

**In-app purchases:** none


### HYDROS App

[App page](https://appshunter.io/ios/app/hydros-app/id1455344294)

Easily monitor and control your aquarium's vital parameters like temperature, pH, and salinity. Manage all your connected devices, including ATOs, lights, and pumps, with a user-friendly interface. Quick setup with preset configurations means no coding is required to get your system running.

**Highlights:** Monitor temperature, ORP, pH, salinity, Control ATO, lights, heaters, pumps, User-friendly interface, Quick setup with presets, Manage multiple devices and aquariums, Set schedules and create modes

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

**In-app purchases:** none


## Frequently asked questions

### Is imOS STYLE free?

imOS STYLE is free to download, with no in-app purchases.

### Is HYDROS App free?

HYDROS App is free to download, with no in-app purchases.

### Do imOS STYLE or HYDROS App have ads?

Neither imOS STYLE nor HYDROS App shows ads.

### Which is updated more often, imOS STYLE or HYDROS App?

imOS STYLE ships an update every 20 months, and HYDROS App every 3 months. Most recently, imOS STYLE was updated on October 7, 2026 and HYDROS App on October 22, 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.*