# Subnet Calculator + vs Quantum Shield

The clearest difference is update cadence: Quantum Shield at every 4 days against Subnet Calculator +'s every 64 months. Quantum Shield also leads on iOS requirement (13.0 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Subnet Calculator + sells 4 one-off in-app purchases and Quantum Shield sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Subnet Calculator + ships an update every 64 months, Quantum Shield every 4 days. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Subnet Calculator + | Quantum Shield |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (7 ratings)](https://appshunter.io/ios/app/subnet-calculator-plus/id445990645/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 52.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 64 months | **Every 4 days** |
| Monetization | Free | — |
| Size | 1 MB | 24 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Steven Eppler](https://appshunter.io/developer/312274388) | [Quantum Secure Labs SL](https://appshunter.io/developer/1895611135) |

## What reviewers say

### Subnet Calculator +

[App page](https://appshunter.io/ios/app/subnet-calculator-plus/id445990645)

This utility app simplifies network calculations for professionals and students. It offers tools for IPv4 and IPv6 subnetting, including live CIDR sliders and subnet splitting. Results can be easily shared or copied.

**Highlights:** IPv4 subnet calculator with CIDR slider, Subnet Splitter for VLSM, IPv6 calculator with prefix slider, Auto-detect device IP from Wi-Fi, Navigate adjacent subnets, Share or copy results, Native Mac support

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $1.99 | one-time |
| Large Tip | $4.99 | one-time |
| Huge Tip | $9.99 | one-time |


### Quantum Shield

[App page](https://appshunter.io/ios/app/quantum-shield-anti-scam/id6764045374)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Mensual | $3.99 | per month |
| Shield Mensual | $8.99 | per month |
| Plus Anual | $25.00 | per year |
| Shield Anual | $69.00 | per year |


## Frequently asked questions

### Is Subnet Calculator + free?

Subnet Calculator + is free to download, with in-app purchases available.

### Is Quantum Shield free?

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

### Do Subnet Calculator + or Quantum Shield have ads?

Neither Subnet Calculator + nor Quantum Shield shows ads.

### Which is updated more often, Subnet Calculator + or Quantum Shield?

Subnet Calculator + ships an update every 64 months, and Quantum Shield every 4 days. Most recently, Subnet Calculator + was updated on October 27, 2026 and Quantum Shield 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.*