# Calvin Chess Trainer vs KarpaChess

Calvin Chess Trainer and KarpaChess are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Calvin Chess Trainer ships an update every 5 days, KarpaChess every 3 days. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Calvin Chess Trainer | KarpaChess |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Size | 170 MB | 171 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DAVID MARKLE](https://appshunter.io/developer/1880745263) | [Mourad GHAFIRI](https://appshunter.io/developer/1896774994) |

## 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


### KarpaChess

[App page](https://appshunter.io/ios/app/karpachess/id6808091046)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calvin Chess Trainer free?

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

### Is KarpaChess free?

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

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

Neither Calvin Chess Trainer nor KarpaChess shows ads.

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

Calvin Chess Trainer ships an update every 5 days, and KarpaChess every 3 days. Most recently, Calvin Chess Trainer was updated on October 25, 2026 and KarpaChess on October 23, 2026.

---

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