# Calvin Chess Trainer vs PatternForge

The clearest difference is in-app purchases: Calvin Chess Trainer at none against PatternForge's 2. Calvin Chess Trainer also leads on device support (3 vs 1). PatternForge's advantage is update cadence (every 2 days vs every 5 days). On price, ads and iOS requirement there is nothing between them.

Both are free to download. PatternForge sells 2 in-app purchases, starting at $2.99 per month. Calvin Chess Trainer asks for nothing beyond the download.

Calvin Chess Trainer ships an update every 5 days, PatternForge every 2 days. The most recent releases landed on September 15, 2026 and September 2, 2026 respectively.

## The numbers

| Metric | Calvin Chess Trainer | PatternForge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/patternforge-chess-tactics/id6760562677/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 2 days** |
| Monetization | — | Free with in-app purchases |
| Size | 215 MB | 58 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DAVID MARKLE](https://appshunter.io/developer/1880745263) | [ZYAGA LLC](https://appshunter.io/developer/1860895535) |

## What reviewers say

### Calvin Chess Trainer

[App page](https://appshunter.io/ios/app/calvin-chess-trainer/id6759800929)

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

**In-app purchases:** none


### PatternForge

[App page](https://appshunter.io/ios/app/patternforge-chess-tactics/id6760562677)

This app uses spaced repetition to help you master chess tactics. Solve puzzles adapted to your skill level, review them on a schedule, and import your own games to turn mistakes into training opportunities. Create custom puzzle sets to focus on specific patterns and improve your game.

**Highlights:** Spaced repetition training, Adaptive puzzle difficulty, Game import from Chess.com/Lichess, Custom puzzle sets, Theme-based training, Progress tracking

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Yearly | $29.99 | per year |


## Frequently asked questions

### Is Calvin Chess Trainer free?

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

### Is PatternForge free?

PatternForge is free to download, with in-app purchases available.

### Do Calvin Chess Trainer or PatternForge have ads?

Neither Calvin Chess Trainer nor PatternForge shows ads.

### Which is updated more often, Calvin Chess Trainer or PatternForge?

Calvin Chess Trainer ships an update every 5 days, and PatternForge every 2 days. Most recently, Calvin Chess Trainer was updated on September 15, 2026 and PatternForge on September 2, 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.*