# Photo Differences Old Castles vs Find Differences AI Challenge

The clearest difference is in-app purchases: Photo Differences Old Castles at none against Find Differences AI Challenge's 2. Photo Differences Old Castles also leads on update cadence (monthly vs every 6 months) and iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Find Differences AI Challenge sells 2 one-off in-app purchases. Photo Differences Old Castles asks for nothing beyond the download.

Photo Differences Old Castles ships an update monthly, Find Differences AI Challenge every 6 months. The most recent releases landed on September 15, 2026 and August 21, 2026 respectively.

## The numbers

| Metric | Photo Differences Old Castles | Find Differences AI Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (35 ratings)](https://appshunter.io/ios/app/find-differences-ai-challenge/id6499434659/reviews)** |
| Number of ratings | — | **35** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Monthly** | Every 6 months |
| Monetization | — | Ad-supported |
| Size | 79 MB | 276 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Adrijana Jakovljevic](https://appshunter.io/developer/1486022934) | [Alexey Romanov](https://appshunter.io/developer/1596744891) |

## What reviewers say

### Photo Differences Old Castles

[App page](https://appshunter.io/ios/app/photo-differences-old-castles/id1664135973)

**Features:** macOS Compatibility

**In-app purchases:** none


### Find Differences AI Challenge

[App page](https://appshunter.io/ios/app/find-differences-ai-challenge/id6499434659)

Engage your visual perception with AI-generated images in this relaxing spot-the-difference game. Sharpen your cognitive skills with no timers, perfect for all ages seeking mental stimulation and a tranquil pastime.

**Highlights:** AI-generated photorealistic images, Relaxing gameplay without timers, Brain training for cognitive skills, Intuitive and easy-to-learn gameplay, Offline play capability, Vast array of challenging levels

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add 30 Hints | $0.99 | one-time |
| Add 300 Hints | $7.99 | one-time |


## Frequently asked questions

### Is Photo Differences Old Castles free?

Photo Differences Old Castles is free to download, with no in-app purchases.

### Is Find Differences AI Challenge free?

Find Differences AI Challenge is free to download, with in-app purchases available.

### Do Photo Differences Old Castles or Find Differences AI Challenge have ads?

Both Photo Differences Old Castles and Find Differences AI Challenge show ads.

### Which is updated more often, Photo Differences Old Castles or Find Differences AI Challenge?

Photo Differences Old Castles ships an update monthly, and Find Differences AI Challenge every 6 months. Most recently, Photo Differences Old Castles was updated on September 15, 2026 and Find Differences AI Challenge on August 21, 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.*