# Chess Defense Trainer vs Chess9

The clearest difference is in-app purchases: Chess9 at none against Chess Defense Trainer's 6. Chess9 also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Chess Defense Trainer sells 6 in-app purchases, starting at $2.99 per month. Chess9 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Chess Defense Trainer | Chess9 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | Every 2 months |
| Size | 117 MB | 11 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [Dawid Wrzesinski](https://appshunter.io/developer/1812701337) | [Shashwat Patel](https://appshunter.io/developer/1873309489) |

## What reviewers say

### Chess Defense Trainer

[App page](https://appshunter.io/ios/app/chess-defense-trainer/id6747926627)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Espresso Subscription | $2.99 | per month |
| Flat White Subscription | $5.99 | per 3 months |
| Latte Subscription | $7.99 | per 6 months |
| Espresso | $3.99 | one-time |
| Flat White | $6.99 | one-time |
| Latte | $9.99 | one-time |


### Chess9

[App page](https://appshunter.io/ios/app/chess9/id6758634392)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chess Defense Trainer free?

Chess Defense Trainer is free to download, with in-app purchases available.

### Is Chess9 free?

Chess9 is free to download, with no in-app purchases.

### Do Chess Defense Trainer or Chess9 have ads?

Chess Defense Trainer shows ads; Chess9 does not.

### Which is updated more often, Chess Defense Trainer or Chess9?

Chess Defense Trainer ships an update every 2 months, and Chess9 every 2 months. Most recently, Chess Defense Trainer was updated on November 5, 2026 and Chess9 on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*