# Chess Knowledge vs Chess Opening Tactics Trainer

The clearest difference is in-app purchases: Chess Knowledge at none against Chess Opening Tactics Trainer's 7. Chess Knowledge also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.4). On price and update cadence there is nothing between them.

Both are free to download. Chess Opening Tactics Trainer sells 7 in-app purchases, starting at $2.99 per month. Chess Knowledge asks for nothing beyond the download.

Chess Knowledge ships an update monthly, Chess Opening Tactics Trainer every 2 months. The most recent releases landed on September 30, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Chess Knowledge | Chess Opening Tactics Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | **Monthly** | Every 2 months |
| Size | 86 MB | 141 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Chess Knowledge FZE](https://appshunter.io/developer/1628767249) | [Dawid Wrzesinski](https://appshunter.io/developer/1812701337) |

## What reviewers say

### Chess Knowledge

[App page](https://appshunter.io/ios/app/chess-knowledge/id1628767247)

**Features:** macOS Compatibility

**In-app purchases:** none


### Chess Opening Tactics Trainer

[App page](https://appshunter.io/ios/app/chess-opening-tactics-trainer/id6748003312)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Espresso Subscription | $2.99 | per month |
| Flat White Subscription | $5.99 | per 3 months |
| Latte Subscription | $7.99 | per 6 months |
| Super Large Subscription | $12.99 | per year |
| Espresso | $3.99 | one-time |
| Flat White | $6.99 | one-time |
| Latte | $9.99 | one-time |


## Frequently asked questions

### Is Chess Knowledge free?

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

### Is Chess Opening Tactics Trainer free?

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

### Which is updated more often, Chess Knowledge or Chess Opening Tactics Trainer?

Chess Knowledge ships an update monthly, and Chess Opening Tactics Trainer every 2 months. Most recently, Chess Knowledge was updated on September 30, 2026 and Chess Opening Tactics Trainer on September 13, 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.*