# Ulla Popken vs Kastern

The clearest difference is iOS requirement: Kastern at 13.0 against Ulla Popken's 15.5. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Ulla Popken ships an update fortnightly, Kastern monthly. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Ulla Popken | Kastern |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (47 ratings)](https://appshunter.io/ios/app/ulla-popken/id1417909798/reviews)** | — |
| Number of ratings | **47** | — |
| Positive reviews | 36.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 123 MB | 47 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Popken Fashion GmbH](https://appshunter.io/developer/1417909797) | [UCO software development LTD](https://appshunter.io/developer/568878320) |

## What reviewers say

### Ulla Popken

[App page](https://appshunter.io/ios/app/ulla-popken/id1417909798)

Discover trendy plus-size fashion designed to flatter and accentuate your curves. Find comfortable and stylish clothing for everyday wear, work, special occasions, and holidays. Explore a wide range of dresses, pants, outerwear, and lingerie.

**Highlights:** Plus size clothing for women, Trendy designs and comfortable cuts, High-quality fabrics like cotton, Figure-hugging and sexy styles, Lounge wear, workwear, and eveningwear, Swimwear and lingerie options, Coats and jackets

**Features:** Apple Wallet

**In-app purchases:** none


### Kastern

[App page](https://appshunter.io/ios/app/kastern/id6747282443)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ulla Popken free?

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

### Is Kastern free?

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

### Do Ulla Popken or Kastern have ads?

Neither Ulla Popken nor Kastern shows ads.

### Which is updated more often, Ulla Popken or Kastern?

Ulla Popken ships an update fortnightly, and Kastern monthly. Most recently, Ulla Popken was updated on November 2, 2026 and Kastern on October 30, 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.*