# Fermax DuoxMe vs Simon iO

The clearest difference is rating: Fermax DuoxMe at 4.6 against Simon iO's 1.0. Fermax DuoxMe also leads on ads (none vs shown) and review sentiment (55% vs 29%). Simon iO's advantage is in-app purchases (none vs 2) and iOS requirement (14.0 vs 18.0). On price, monetization model and device support there is nothing between them.

Both are free to download. Fermax DuoxMe sells 2 in-app purchases, starting at $2.00 per month. Simon iO asks for nothing beyond the download.

Fermax DuoxMe holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Fermax DuoxMe has 263 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 55% of Fermax DuoxMe's written reviews are positive against 29% of Simon iO's.

Fermax DuoxMe ships an update monthly, Simon iO every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Fermax DuoxMe | Simon iO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (263 ratings)](https://appshunter.io/ios/app/fermax-duoxme/id1442204916/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/simon-io/id1477805916/reviews) |
| Number of ratings | **263** | 2 |
| Positive reviews | **55.1% of reviews** | 28.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 150 MB | 91 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fermax](https://appshunter.io/developer/891332024) | [Simon](https://appshunter.io/developer/531284305) |

## What reviewers say

### Fermax DuoxMe

[App page](https://appshunter.io/ios/app/fermax-duoxme/id1442204916)

Control your Fermax video door entry system remotely. Answer calls, open doors, and check visitors from anywhere in the world. Share digital keys securely with family and friends, simplifying access to your home.

**Highlights:** Answer video door calls remotely, Open doors instantly, Check visitor history, Share digital keys, Connect via Wi-Fi monitor or Fermax CONNECT

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Monthly | $2.00 | per month |
| Unlimited annual | $17.00 | per year |


### Simon iO

[App page](https://appshunter.io/ios/app/simon-io/id1477805916)

Control your smart home devices, including lights and blinds, from anywhere. Receive notifications, schedule routines, and customize device functionalities like lighting levels and power control. This app enhances your iO universe with a world of possibilities.

**Highlights:** Configure iO devices and experiences, Control lights and blinds, Receive notifications, Schedule routines, Adjust lighting levels, Power control for devices

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fermax DuoxMe free?

Fermax DuoxMe is free to download, with in-app purchases available.

### Is Simon iO free?

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

### Which has better reviews, Fermax DuoxMe or Simon iO?

Fermax DuoxMe is rated higher. Fermax DuoxMe averages 4.6 out of 5 from 263 ratings, while Simon iO averages 1.0 from 2 ratings.

### Do Fermax DuoxMe or Simon iO have ads?

Simon iO shows ads; Fermax DuoxMe does not.

### Which is updated more often, Fermax DuoxMe or Simon iO?

Fermax DuoxMe ships an update monthly, and Simon iO every 3 months. Most recently, Fermax DuoxMe was updated on October 24, 2026 and Simon iO on October 24, 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.*