# TimerOn vs DUO System

The clearest difference is review sentiment: DUO System at 100% against TimerOn's 0%. DUO System also leads on update cadence (every 9 months vs every 28 months) and iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

TimerOn ships an update every 28 months, DUO System every 9 months. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | TimerOn | DUO System |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 9 months** |
| Monetization | Free | Free |
| Size | 40 MB | 15 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gewiss S.p.A.](https://appshunter.io/developer/978344889) | [ACI srl](https://appshunter.io/developer/1124362356) |

## What reviewers say

### TimerOn

[App page](https://appshunter.io/ios/app/timeron/id1453174710)

Manage and program GEWISS 90 TMR digital time switches directly from your smartphone or tablet using Bluetooth. Create daily and weekly ON/OFF schedules, synchronize settings, and update time switch configurations remotely.

**Highlights:** Bluetooth time switch management, Create daily/weekly ON/OFF programs, Synchronize and copy time switch settings, Update date, hour, and localization, Command relay status (temporary, permanent, random)

**In-app purchases:** none


### DUO System

[App page](https://appshunter.io/ios/app/duo-system/id1492297534)

Easily program Farfisa Duo System devices with this intuitive application. Streamline your device setup and configuration process.

**Highlights:** Program Farfisa Duo System devices, Intuitive interface, Streamlined configuration, Device setup assistance

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TimerOn free?

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

### Is DUO System free?

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

### Do TimerOn or DUO System have ads?

Neither TimerOn nor DUO System shows ads.

### Which is updated more often, TimerOn or DUO System?

TimerOn ships an update every 28 months, and DUO System every 9 months. Most recently, TimerOn was updated on October 1, 2026 and DUO System on October 5, 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.*