# AIDP vs S4U

The clearest difference is in-app purchases: AIDP at none against S4U's 1. S4U's advantage is update cadence (every 2 days vs weekly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. S4U sells 1 one-off in-app purchase. AIDP asks for nothing beyond the download.

AIDP ships an update weekly, S4U every 2 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | AIDP | S4U |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Size | 27 MB | 118 MB |
| Requires iOS | **13** | 14.0.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [DIGITAL FOREST SRL](https://appshunter.io/developer/581246108) | [Security for You](https://appshunter.io/developer/1880089873) |

## What reviewers say

### AIDP

[App page](https://appshunter.io/ios/app/aidp/id6740077098)

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

**In-app purchases:** none


### S4U

[App page](https://appshunter.io/ios/app/s4u-security-4-you/id6759669935)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| no_ads_lifetime | $3.99 | one-time |


## Frequently asked questions

### Is AIDP free?

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

### Is S4U free?

S4U is free to download, with in-app purchases available.

### Do AIDP or S4U have ads?

Neither AIDP nor S4U shows ads.

### Which is updated more often, AIDP or S4U?

AIDP ships an update weekly, and S4U every 2 days. Most recently, AIDP was updated on October 30, 2026 and S4U on November 5, 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.*