# GM ChessPrep vs Calvin Chess Trainer

The clearest difference is update cadence: Calvin Chess Trainer at every 5 days against GM ChessPrep's every 42 months. 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.

GM ChessPrep ships an update every 42 months, Calvin Chess Trainer every 5 days. The most recent releases landed on October 2, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | GM ChessPrep | Calvin Chess Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 5 days** |
| Size | 3 MB | 170 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [GMCHESSPREP LLC](https://appshunter.io/developer/1664061168) | [DAVID MARKLE](https://appshunter.io/developer/1880745263) |

## What reviewers say

### GM ChessPrep

[App page](https://appshunter.io/ios/app/gm-chessprep/id1664061166)

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

**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 GM ChessPrep free?

GM ChessPrep 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 GM ChessPrep or Calvin Chess Trainer have ads?

Neither GM ChessPrep nor Calvin Chess Trainer shows ads.

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

GM ChessPrep ships an update every 42 months, and Calvin Chess Trainer every 5 days. Most recently, GM ChessPrep was updated on October 2, 2026 and Calvin Chess Trainer on October 19, 2026.

---

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