# Undead castle vs Equilibrium

The clearest difference is update cadence: Equilibrium at every 2 months against Undead castle's every 11 months. Equilibrium also leads on iOS requirement (6.0 vs 12.0). 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.

Undead castle ships an update every 11 months, Equilibrium every 2 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Undead castle | Equilibrium |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/undead-castle/id978448091/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 39 MB | 8 MB |
| Requires iOS | 12.0 | **6.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [娟 杜](https://appshunter.io/developer/974748350) | [Pruettanon Rattanalaoo](https://appshunter.io/developer/1116872237) |

## What reviewers say

### Undead castle

[App page](https://appshunter.io/ios/app/undead-castle/id978448091)

A casual puzzle game where the goal is to open doors by solving hidden object puzzles. It offers a variety of challenging brain teasers and uses different interaction methods like clicking and sliding. Continuously updated with new puzzles, it's a free and addictive experience.

**Highlights:** Room escape gameplay, Hidden object puzzles, Challenging brain teasers, Multiple interaction methods, Constantly updated puzzles, Free to play

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

**In-app purchases:** none


### Equilibrium

[App page](https://appshunter.io/ios/app/equilibrium-building-perfect-block/id1123374241)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Undead castle free?

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

### Is Equilibrium free?

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

### Do Undead castle or Equilibrium have ads?

Neither Undead castle nor Equilibrium shows ads.

### Which is updated more often, Undead castle or Equilibrium?

Undead castle ships an update every 11 months, and Equilibrium every 2 months. Most recently, Undead castle was updated on November 1, 2026 and Equilibrium on November 2, 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.*