# Simple Subnet Calc vs TrustOTP

The clearest difference is in-app purchases: Simple Subnet Calc at none against TrustOTP's 2. Simple Subnet Calc also leads on ads (none vs shown) and iOS requirement (18.0 vs 26.2). TrustOTP's advantage is update cadence (every 3 weeks vs every 6 months). On price and device support there is nothing between them.

Both are free to download. TrustOTP sells 2 in-app purchases, starting at $2.99 per month. Simple Subnet Calc asks for nothing beyond the download.

Simple Subnet Calc ships an update every 6 months, TrustOTP every 3 weeks. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Simple Subnet Calc | TrustOTP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/simple-subnet-calc/id665684290/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 60.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 1 MB | 13 MB |
| Requires iOS | **18.0** | 26.2 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Diogo Andre Assumpcao](https://appshunter.io/developer/665684293) | [Jean Delio Candio](https://appshunter.io/developer/1688875479) |

## What reviewers say

### Simple Subnet Calc

[App page](https://appshunter.io/ios/app/simple-subnet-calc/id665684290)

This utility quickly calculates IPv4 and IPv6 subnets with a clean interface. It's designed for network professionals and students needing fast, accurate subnetting tools on their iPhone.

**Highlights:** IPv4 subnetting, IPv6 subnetting, Clean interface, Ad-free experience, Designed for professionals

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

**In-app purchases:** none


### TrustOTP

[App page](https://appshunter.io/ios/app/trustotp-2fa-authenticator/id6758748275)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access | $2.99 | per month |
| All Access | $19.99 | per year |


## Frequently asked questions

### Is Simple Subnet Calc free?

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

### Is TrustOTP free?

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

### Do Simple Subnet Calc or TrustOTP have ads?

TrustOTP shows ads; Simple Subnet Calc does not.

### Which is updated more often, Simple Subnet Calc or TrustOTP?

Simple Subnet Calc ships an update every 6 months, and TrustOTP every 3 weeks. Most recently, Simple Subnet Calc was updated on October 7, 2026 and TrustOTP on October 2, 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.*