# Castrum vs Klyx

The clearest difference is review sentiment: Klyx at 100% against Castrum's 41%. Klyx also leads on update cadence (fortnightly vs every 2 months) and iOS requirement (15.0 vs 18.0). Castrum's advantage is in-app purchases (none vs 15). On price, ads and device support there is nothing between them.

Both are free to download. Klyx sells 15 in-app purchases, starting at $1.99 per month. Castrum asks for nothing beyond the download.

Castrum ships an update every 2 months, Klyx fortnightly. The most recent releases landed on September 6, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Castrum | Klyx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/castrum/id1465245349/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 40.9% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1.4 GB | 413 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [DEPARTEMENT DE L AUDE](https://appshunter.io/developer/1465245348) | [ARVision Games Inc](https://appshunter.io/developer/1553485241) |

## What reviewers say

### Castrum

[App page](https://appshunter.io/ios/app/castrum/id1465245349)

Develop a fortified village in 13th-century Occitania to defend against crusaders and aid pursued Cathars. Explore Cathar Country, collect items, and craft resources to preserve local culture. Engage in mini-games at historical monuments for unique rewards.

**Highlights:** Develop a fortified village, Collect and craft items, Explore Cathar Country, Geotagged mini-games at monuments, Historical narrative, Unlock legendary tools

**Features:** macOS Compatibility

**In-app purchases:** none


### Klyx

[App page](https://appshunter.io/ios/app/klyx/id1553485239)

Experience immersive multiplayer escape rooms in Augmented Reality. Analyze environments, find clues, and solve puzzles to complete unique missions. Play solo or with friends in this challenging AR adventure.

**Highlights:** Multiplayer AR escape rooms, Analyze environments and search for clues, Solve enigmas and riddles, Host and join private games, Hints available, Original music tracks

**Features:** macOS Compatibility

**In-app purchases (15)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Plan | $1.99 | per month |
| Premium (1-Month) | $2.99 | per month |
| Save The Cup Series | $6.99 | per year |
| Yearly Standard Plan | $19.99 | per year |
| Premium Plan (1-Year) | $29.99 | per year |
| Anubis | $2.99 | one-time |
| 50 coins | $3.99 | one-time |
| ChocoFactory | $3.99 | one-time |
| BioHazard | $3.99 | one-time |
| Save The Cup Ep1 | $3.99 | one-time |
| Save The Cup Ep 2 | $3.99 | one-time |
| Save The Cup Ep.3 | $3.99 | one-time |
| 100 coins | $6.99 | one-time |
| 200 coins | $9.99 | one-time |
| 1350 coins | $39.99 | one-time |


## Frequently asked questions

### Is Castrum free?

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

### Is Klyx free?

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

### Do Castrum or Klyx have ads?

Neither Castrum nor Klyx shows ads.

### Which is updated more often, Castrum or Klyx?

Castrum ships an update every 2 months, and Klyx fortnightly. Most recently, Castrum was updated on September 6, 2026 and Klyx on September 11, 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.*