# Hydronics vs SDF

The clearest difference is update cadence: Hydronics at every 3 weeks against SDF's every 4 months. Hydronics also leads on iOS requirement (11.0 vs 15.1). 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.

Hydronics ships an update every 3 weeks, SDF every 4 months. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Hydronics | SDF |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Free | — |
| Size | 41 MB | 42 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pablo Cassi](https://appshunter.io/developer/1347314111) | [Colegio de Escribanos de la Ciudad de Buenos Aires](https://appshunter.io/developer/1185879051) |

## What reviewers say

### Hydronics

[App page](https://appshunter.io/ios/app/hydronics/id1347314112)

Control your pool's lighting and other connected devices wirelessly from your mobile device. Create custom light effects, set schedules, and even sync lights to music for an enhanced entertainment experience.

**Highlights:** Wi-Fi controlled pool lighting, Mobile app control (phone/tablet), Customizable light effects and intensity, Audio-reactive lighting, Programmable schedules for lights and other devices, Stainless steel construction, Simple installation

**Features:** macOS Compatibility

**In-app purchases:** none


### SDF

[App page](https://appshunter.io/ios/app/sdf/id6747388469)

**In-app purchases:** none


## Frequently asked questions

### Is Hydronics free?

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

### Is SDF free?

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

### Do Hydronics or SDF have ads?

Neither Hydronics nor SDF shows ads.

### Which is updated more often, Hydronics or SDF?

Hydronics ships an update every 3 weeks, and SDF every 4 months. Most recently, Hydronics was updated on October 9, 2026 and SDF on October 1, 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.*