# Autofirma App vs Fermax DuoxMe

The clearest difference is review sentiment: Fermax DuoxMe at 55% against Autofirma App's 6%. Fermax DuoxMe also leads on update cadence (monthly vs every 7 months). Autofirma App's advantage is in-app purchases (none vs 2). On price, ads, device support and iOS requirement there is nothing between them.

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

Autofirma App ships an update every 7 months, Fermax DuoxMe monthly. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Autofirma App | Fermax DuoxMe |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (263 ratings)](https://appshunter.io/ios/app/fermax-duoxme/id1442204916/reviews)** |
| Number of ratings | — | **263** |
| Positive reviews | 6.2% of reviews | **55.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 150 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ministerio de Asuntos Economicos y Transformacion Digital](https://appshunter.io/developer/627410004) | [Fermax](https://appshunter.io/developer/891332024) |

## What reviewers say

### Autofirma App

[App page](https://appshunter.io/ios/app/autofirma-app/id627410001)

Sign electronic documents and PDFs directly from your iOS device. Supports web-based transactions and local files, requiring a digital certificate for secure authentication. Compatible with iOS 17+ and any web browser.

**Highlights:** Electronic signature for web transactions, Sign PDF documents, Digital certificate installation, iOS 17+ compatibility, Web browser integration, Cloud storage access

**Features:** Vision Pro support

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Autofirma App free?

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

### Is Fermax DuoxMe free?

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

### Do Autofirma App or Fermax DuoxMe have ads?

Neither Autofirma App nor Fermax DuoxMe shows ads.

### Which is updated more often, Autofirma App or Fermax DuoxMe?

Autofirma App ships an update every 7 months, and Fermax DuoxMe monthly. Most recently, Autofirma App was updated on October 22, 2026 and Fermax DuoxMe 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.*