# Castrum vs FlashTheWorld

The clearest difference is review sentiment: FlashTheWorld at 90% against Castrum's 41%. FlashTheWorld also leads on update cadence (every 3 days vs every 2 months) and iOS requirement (16.4 vs 18.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Castrum ships an update every 2 months, FlashTheWorld every 3 days. The most recent releases landed on October 8, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Castrum | FlashTheWorld |
| --- | --- | --- |
| 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 | **90.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free | Free |
| Size | 1.4 GB | 51 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DEPARTEMENT DE L AUDE](https://appshunter.io/developer/1465245348) | [Francois Mari](https://appshunter.io/developer/1598621137) |

## 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


### FlashTheWorld

[App page](https://appshunter.io/ios/app/flashtheworld/id6752034956)

Turn cultural heritage into an exploration game. Scan real-world monuments with your camera to learn their history, earn points, and build your collection. Compete with others on interactive maps and leaderboards.

**Highlights:** Scan real monuments with AI identification, Explore monuments on interactive maps, Track progress and rankings, Discover live flashes worldwide, Build a monument collection

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

**In-app purchases:** none


## Frequently asked questions

### Is Castrum free?

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

### Is FlashTheWorld free?

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

### Do Castrum or FlashTheWorld have ads?

Neither Castrum nor FlashTheWorld shows ads.

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

Castrum ships an update every 2 months, and FlashTheWorld every 3 days. Most recently, Castrum was updated on October 8, 2026 and FlashTheWorld on October 12, 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.*