# UDC vs Vision4k Classes

The clearest difference is update cadence: UDC at every 3 weeks against Vision4k Classes's every 2 months. 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.

UDC ships an update every 3 weeks, Vision4k Classes every 2 months. The most recent releases landed on October 6, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | UDC | Vision4k Classes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Size | 218 MB | 47 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Arturo Conde Perez](https://appshunter.io/developer/1622072131) | [Sistemas y Paquetes de Computo de Mexico](https://appshunter.io/developer/1745542957) |

## What reviewers say

### UDC

[App page](https://appshunter.io/ios/app/udc/id1628882483)

**In-app purchases:** none


### Vision4k Classes

[App page](https://appshunter.io/ios/app/vision4k-classes/id6502621114)

**In-app purchases:** none


## Frequently asked questions

### Is UDC free?

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

### Is Vision4k Classes free?

Vision4k Classes is free to download, with no in-app purchases.

### Do UDC or Vision4k Classes have ads?

Neither UDC nor Vision4k Classes shows ads.

### Which is updated more often, UDC or Vision4k Classes?

UDC ships an update every 3 weeks, and Vision4k Classes every 2 months. Most recently, UDC was updated on October 6, 2026 and Vision4k Classes on September 17, 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.*