# BookMoves vs Calvin Chess Trainer

The clearest difference is update cadence: Calvin Chess Trainer at every 5 days against BookMoves's every 3 weeks. BookMoves's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BookMoves ships an update every 3 weeks, Calvin Chess Trainer every 5 days. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | BookMoves | Calvin Chess Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4 ratings)](https://appshunter.io/ios/app/bookmoves/id6469711333/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Free | — |
| Size | 70 MB | 170 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Regulus Team s.r.o.](https://appshunter.io/developer/1563166617) | [DAVID MARKLE](https://appshunter.io/developer/1880745263) |

## What reviewers say

### BookMoves

[App page](https://appshunter.io/ios/app/bookmoves/id6469711333)

Master chess openings with a unique blend of theory, computer science, and spaced repetition. Memorize hundreds of variants for both sides and transition from rote learning to intuitive application. Overcome the forgetting curve with an innovative technique for lasting mastery.

**Highlights:** Chess opening theory, Spaced repetition learning, Hundreds of chess variants, Statistical probabilities, Integrated scoring system, Algorithmic improvement

**Features:** macOS Compatibility

**In-app purchases:** none


### Calvin Chess Trainer

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

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

**In-app purchases:** none


## Frequently asked questions

### Is BookMoves free?

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

### Is Calvin Chess Trainer free?

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

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

Neither BookMoves nor Calvin Chess Trainer shows ads.

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

BookMoves ships an update every 3 weeks, and Calvin Chess Trainer every 5 days. Most recently, BookMoves was updated on October 20, 2026 and Calvin Chess Trainer on October 25, 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.*