# cDemy vs AI Physics Explanation

The clearest difference is in-app purchases: cDemy at none against AI Physics Explanation's 2. cDemy also leads on ads (none vs shown) and device support (3 vs 1). AI Physics Explanation's advantage is update cadence (every 6 weeks vs every 4 months). On price there is nothing between them.

Both are free to download. AI Physics Explanation sells 2 in-app purchases, starting at $3.99 per 7 days. cDemy asks for nothing beyond the download.

cDemy ships an update every 4 months, AI Physics Explanation every 6 weeks. The most recent releases landed on July 6, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | cDemy | AI Physics Explanation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Size | 227 MB | 20 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [CONICLE COMPANY LIMITED](https://appshunter.io/developer/979282578) | [SPARKLE AND, K.K.](https://appshunter.io/developer/1572402899) |

## What reviewers say

### cDemy

[App page](https://appshunter.io/ios/app/cdemy/id6743296381)

**Features:** macOS Compatibility

**In-app purchases:** none


### AI Physics Explanation

[App page](https://appshunter.io/ios/app/ai-physics-explanation/id6743636113)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $3.99 | per 7 days |
| MonthlySubscription | $5.99 | per month |


## Frequently asked questions

### Is cDemy free?

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

### Is AI Physics Explanation free?

AI Physics Explanation is free to download, with in-app purchases available.

### Do cDemy or AI Physics Explanation have ads?

AI Physics Explanation shows ads; cDemy does not.

### Which is updated more often, cDemy or AI Physics Explanation?

cDemy ships an update every 4 months, and AI Physics Explanation every 6 weeks. Most recently, cDemy was updated on July 6, 2026 and AI Physics Explanation on August 16, 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.*