# SF Security vs Quantum Messages

The clearest difference is in-app purchases: SF Security at none against Quantum Messages's 1. SF Security also leads on iOS requirement (8.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Quantum Messages sells 1 one-off in-app purchase. SF Security asks for nothing beyond the download.

## The numbers

| Metric | SF Security | Quantum Messages |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | — |
| Size | 5 MB | 2 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [壮 黄](https://appshunter.io/developer/1140808500) | [嘉胜 陈](https://appshunter.io/developer/1508884749) |

## What reviewers say

### SF Security

[App page](https://appshunter.io/ios/app/sf-security/id1140808501)

**Features:** macOS Compatibility

**In-app purchases:** none


### Quantum Messages

[App page](https://appshunter.io/ios/app/quantum-messages/id6747940707)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $19.99 | one-time |


## Frequently asked questions

### Is SF Security free?

SF Security is free to download, with no in-app purchases.

### Is Quantum Messages free?

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

### Do SF Security or Quantum Messages have ads?

Neither SF Security nor Quantum Messages shows ads.

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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.*