# 0Day vs u

The clearest difference is in-app purchases: u at none against 0Day's 2. u also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.0). On price, update cadence and ads there is nothing between them.

Both are free to download. 0Day sells 2 in-app purchases, starting at $3.99 per month. u asks for nothing beyond the download.

0Day ships an update every 5 days, u every 3 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | 0Day | u |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/0day-cve-and-exploit-alerts/id6761655372/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 10 MB | 41 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Richard Lous](https://appshunter.io/developer/1890695617) | [u-blox Malmo AB](https://appshunter.io/developer/575523398) |

## What reviewers say

### 0Day

[App page](https://appshunter.io/ios/app/0day-cve-and-exploit-alerts/id6761655372)

Receive immediate alerts for zero-day vulnerabilities, supply chain attacks, and compromised packages relevant to your specific technology stack. Get early warnings before they hit the news cycle, enabling proactive security measures.

**Highlights:** Zero-day vulnerability alerts, Supply chain attack notifications, Compromised package warnings, Stack-aware filtering, Early warning system, Push notifications, Full alert archive

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 0Day Pro | $3.99 | per month |
| 0Day Pro | $29.99 | per year |


### u

[App page](https://appshunter.io/ios/app/u-connectxplorer/id6766648417)

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

**In-app purchases:** none


## Frequently asked questions

### Is 0Day free?

0Day is free to download, with in-app purchases available.

### Is u free?

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

### Do 0Day or u have ads?

Neither 0Day nor u shows ads.

### Which is updated more often, 0Day or u?

0Day ships an update every 5 days, and u every 3 days. Most recently, 0Day was updated on October 31, 2026 and u on October 31, 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.*