# Castle Master TD vs 21 Trainer

The clearest difference is in-app purchases: 21 Trainer at none against Castle Master TD's 9. 21 Trainer also leads on ads (none vs shown). Castle Master TD's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 26.0). On price there is nothing between them.

Both are free to download. Castle Master TD sells 9 one-off in-app purchases. 21 Trainer asks for nothing beyond the download.

## The numbers

| Metric | Castle Master TD | 21 Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (150 ratings)](https://appshunter.io/ios/app/castle-master-td/id6450975685/reviews)** | — |
| Number of ratings | **150** | — |
| Positive reviews | 73.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | — |
| Monetization | Free with in-app purchases | — |
| Size | 298 MB | 4 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Cezary Rajkowski](https://appshunter.io/developer/449740164) | [Jan Haider](https://appshunter.io/developer/1793934579) |

## What reviewers say

### Castle Master TD

[App page](https://appshunter.io/ios/app/castle-master-td/id6450975685)

Build powerful structures and plan strategic defenses to engage in epic battles against relentless enemies. Your choices shape your kingdom's destiny in this test of strength, strategy, and survival.

**Highlights:** Fortify your castle, Build powerful structures, Plan strategic defenses, Engage in epic battles, Test strength and strategy, Ensure castle survival

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Peasant Gems Pack | $0.99 | one-time |
| Mini Gem Pack | $2.99 | one-time |
| Starter Pack | $2.99 | one-time |
| Knight Gems Pack | $4.99 | one-time |
| Baron Gems Pack | $9.99 | one-time |
| Premium Offer | $9.99 | one-time |
| Earl Gems Pack | $29.99 | one-time |
| Duke Gems Pack | $59.99 | one-time |
| King Gems Pack | $99.99 | one-time |


### 21 Trainer

[App page](https://appshunter.io/ios/app/21-trainer/id6756545201)

**In-app purchases:** none


## Frequently asked questions

### Is Castle Master TD free?

Castle Master TD is free to download, with in-app purchases available.

### Is 21 Trainer free?

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

### Do Castle Master TD or 21 Trainer have ads?

Castle Master TD shows ads; 21 Trainer does not.

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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.*