# UDLR Sliding puzzles vs Derpy Cat

The clearest difference is iOS requirement: UDLR Sliding puzzles at 13.0 against Derpy Cat's 17.6. 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.

UDLR Sliding puzzles ships an update every 5 days, Derpy Cat every 4 days. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | UDLR Sliding puzzles | Derpy Cat |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 5 days | **Every 4 days** |
| Size | 38 MB | 38 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [景灯 梁](https://appshunter.io/developer/977915723) | [Lucas Moeller](https://appshunter.io/developer/1857074865) |

## What reviewers say

### UDLR Sliding puzzles

[App page](https://appshunter.io/ios/app/udlr-sliding-puzzles/id6476542531)

**Features:** macOS Compatibility

**In-app purchases:** none


### Derpy Cat

[App page](https://appshunter.io/ios/app/derpy-cat/id6760553903)

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

**In-app purchases:** none


## Frequently asked questions

### Is UDLR Sliding puzzles free?

UDLR Sliding puzzles is free to download, with no in-app purchases.

### Is Derpy Cat free?

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

### Do UDLR Sliding puzzles or Derpy Cat have ads?

Both UDLR Sliding puzzles and Derpy Cat show ads.

### Which is updated more often, UDLR Sliding puzzles or Derpy Cat?

UDLR Sliding puzzles ships an update every 5 days, and Derpy Cat every 4 days. Most recently, UDLR Sliding puzzles was updated on November 8, 2026 and Derpy Cat on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*