# U4 vs Keydor

The clearest difference is update cadence: Keydor at every 2 days against U4's every 3 months. U4's advantage is iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

U4 ships an update every 3 months, Keydor every 2 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | U4 | Keydor |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | Ad-supported | — |
| Size | 45 MB | 44 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [U4-Center Diskothek Betriebs GmbH](https://appshunter.io/developer/1470946325) | [Tim Grobecker](https://appshunter.io/developer/1828159490) |

## What reviewers say

### U4

[App page](https://appshunter.io/ios/app/u4/id1470946326)

This loyalty program app allows users to earn points through various activities like scanning cards, inviting friends, or social media engagement. Redeem these points for rewards, exclusive offers, and participate in contests. Stay updated on events and news.

**Highlights:** Earn points through activities, Redeem points for rewards, Access exclusive offers, Participate in contests, Stay updated on events and news, Simple login with Facebook or email

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

**In-app purchases:** none


### Keydor

[App page](https://appshunter.io/ios/app/keydor/id6752119992)

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

**In-app purchases:** none


## Frequently asked questions

### Is U4 free?

U4 is free to download, with no in-app purchases.

### Is Keydor free?

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

### Do U4 or Keydor have ads?

Neither U4 nor Keydor shows ads.

### Which is updated more often, U4 or Keydor?

U4 ships an update every 3 months, and Keydor every 2 days. Most recently, U4 was updated on November 3, 2026 and Keydor 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.*