# CASTEL vs AI Navi

The clearest difference is iOS requirement: CASTEL at 11.0 against AI Navi's 14.0. 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.

CASTEL ships an update every 3 weeks, AI Navi fortnightly. The most recent releases landed on November 2, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CASTEL | AI Navi |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free | — |
| Size | 23 MB | 109 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gening, Inc.](https://appshunter.io/developer/1455164510) | [sota kojima](https://appshunter.io/developer/1653080530) |

## What reviewers say

### CASTEL

[App page](https://appshunter.io/ios/app/castel/id1455164511)

Discover domestic theme parks with this app. Features include an favorites function and an improved article list for detailed park information.

**Highlights:** Domestic theme park information, Favorites function, Improved article list, Detailed park information

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

**In-app purchases:** none


### AI Navi

[App page](https://appshunter.io/ios/app/ai-navi/id6444205829)

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

**In-app purchases:** none


## Frequently asked questions

### Is CASTEL free?

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

### Is AI Navi free?

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

### Do CASTEL or AI Navi have ads?

Neither CASTEL nor AI Navi shows ads.

### Which is updated more often, CASTEL or AI Navi?

CASTEL ships an update every 3 weeks, and AI Navi fortnightly. Most recently, CASTEL was updated on November 2, 2026 and AI Navi on October 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.*