# MailShield Guardian vs Quantum Shield

The clearest difference is update cadence: MailShield Guardian at every 2 days against Quantum Shield's every 4 days. Quantum Shield's advantage is iOS requirement (13.0 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. MailShield Guardian sells 4 in-app purchases, starting at $6.99 per month 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.

MailShield Guardian ships an update every 2 days, Quantum Shield every 4 days. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | MailShield Guardian | Quantum Shield |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/mailshield-guardian/id6760969901/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | Free with in-app purchases | — |
| Size | 87 MB | 24 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [GliPpiN Toys, LLC](https://appshunter.io/developer/1887088153) | [Quantum Secure Labs SL](https://appshunter.io/developer/1895611135) |

## What reviewers say

### MailShield Guardian

[App page](https://appshunter.io/ios/app/mailshield-guardian/id6760969901)

This app uses AI to detect and protect against various scams, including mail, texts, emails, calls, and payment requests. It provides clear verdicts and offers features like a recovery wizard and community scam database. Optional subscriptions add always-on protection and family monitoring.

**Highlights:** AI scam analysis for mail, texts, emails, calls, and payments, Clear 'safe/suspicious/scam' verdicts, Recovery Wizard for post-scam assistance, Senior Mode with larger text and simpler flow, CallKit integration for labeling scam numbers, Anonymous sign-in and privacy-focused processing

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MailShield Pro | $6.99 | per month |
| Family Monthly | $9.99 | per month |
| MailShield Pro | $49.99 | per year |
| MailShield Pro | $89.99 | per year |


### 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 MailShield Guardian free?

MailShield Guardian 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 MailShield Guardian or Quantum Shield have ads?

Neither MailShield Guardian nor Quantum Shield shows ads.

### Which is updated more often, MailShield Guardian or Quantum Shield?

MailShield Guardian ships an update every 2 days, and Quantum Shield every 4 days. Most recently, MailShield Guardian was updated on October 7, 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.*