# Subnet Mask Calc vs Fnopt Authenticator

The clearest difference is ads: Fnopt Authenticator at none against Subnet Mask Calc's shown. Subnet Mask Calc's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price and in-app purchases there is nothing between them.

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

## The numbers

| Metric | Subnet Mask Calc | Fnopt Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (22 ratings)](https://appshunter.io/ios/app/subnet-mask-calc/id406375326/reviews)** | — |
| Number of ratings | **22** | — |
| Positive reviews | 38.9% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | — |
| Monetization | Ad-supported | — |
| Size | 3 MB | 4 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [John Rouda](https://appshunter.io/developer/396597129) | [Subaio Limited](https://appshunter.io/developer/1687419675) |

## What reviewers say

### Subnet Mask Calc

[App page](https://appshunter.io/ios/app/subnet-mask-calc/id406375326)

This free utility app quickly calculates subnet masks and wildcard masks for IPv4 networks. It's designed for IT professionals and students to simplify complex networking tasks and aid in certification preparation, offering offline functionality.

**Highlights:** Lightning-fast subnet calculations, Offline network connectivity, Calculates IP and wildcard masks, User-friendly interface, Ideal for IT engineers, Learning aid for certifications

**Features:** macOS Compatibility

**In-app purchases:** none


### Fnopt Authenticator

[App page](https://appshunter.io/ios/app/fnopt-authenticator/id6744995705)

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

**In-app purchases:** none


## Frequently asked questions

### Is Subnet Mask Calc free?

Subnet Mask Calc is free to download, with no in-app purchases.

### Is Fnopt Authenticator free?

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

### Do Subnet Mask Calc or Fnopt Authenticator have ads?

Subnet Mask Calc shows ads; Fnopt Authenticator does not.

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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.*