# Colección Digital UDA vs Ulern

The clearest difference is in-app purchases: Colección Digital UDA at none against Ulern's 6. Ulern's advantage is update cadence (every 6 days vs every 2 weeks) and iOS requirement (14.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. Ulern sells 6 in-app purchases, starting at $0.99 per 7 days. Colección Digital UDA asks for nothing beyond the download.

Colección Digital UDA ships an update every 2 weeks, Ulern every 6 days. The most recent releases landed on October 13, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Colección Digital UDA | Ulern |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Size | 71 MB | 77 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ODILOTID SL](https://appshunter.io/developer/976580041) | [Ulern](https://appshunter.io/developer/1817026359) |

## What reviewers say

### Colección Digital UDA

[App page](https://appshunter.io/ios/app/coleccion-digital-uda/id6449221791)

**In-app purchases:** none


### Ulern

[App page](https://appshunter.io/ios/app/ulern/id6736619861)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ulern Plus Semanal | $0.99 | per 7 days |
| Ulern Plus | $1.99 | per month |
| Ulern Plus Semanal | $3.99 | per 7 days |
| Ulern Plus | $8.99 | per month |
| Ulern Plus Anual | $14.99 | per year |
| Ulern Plus | $79.99 | per year |


## Frequently asked questions

### Is Colección Digital UDA free?

Colección Digital UDA is free to download, with no in-app purchases.

### Is Ulern free?

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

### Do Colección Digital UDA or Ulern have ads?

Neither Colección Digital UDA nor Ulern shows ads.

### Which is updated more often, Colección Digital UDA or Ulern?

Colección Digital UDA ships an update every 2 weeks, and Ulern every 6 days. Most recently, Colección Digital UDA was updated on October 13, 2026 and Ulern on September 18, 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.*