# Calvin Chess Trainer vs Chess Notation Fluency

The clearest difference is in-app purchases: Calvin Chess Trainer at none against Chess Notation Fluency's 1. Calvin Chess Trainer also leads on iOS requirement (15.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Chess Notation Fluency sells 1 one-off in-app purchase. Calvin Chess Trainer asks for nothing beyond the download.

Calvin Chess Trainer ships an update every 5 days, Chess Notation Fluency every 3 days. The most recent releases landed on October 3, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Calvin Chess Trainer | Chess Notation Fluency |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/chess-notation-fluency/id6809233054/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 215 MB | 42 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [DAVID MARKLE](https://appshunter.io/developer/1880745263) | [Mark Harris](https://appshunter.io/developer/6799526558) |

## 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


### Chess Notation Fluency

[App page](https://appshunter.io/ios/app/chess-notation-fluency/id6809233054)

Master chess notation with interactive exercises. Practice reading and writing Standard Algebraic Notation (SAN) using real game sequences. Track your progress and learn from detailed results.

**Highlights:** Read and write Standard Algebraic Notation (SAN), Practice with real game sequences, Train notation in both directions, Customizable practice modes, Detailed performance tracking, Offline practice available, No personal data collection

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Game Library | $4.99 | one-time |


## Frequently asked questions

### Is Calvin Chess Trainer free?

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

### Is Chess Notation Fluency free?

Chess Notation Fluency is free to download, with in-app purchases available.

### Do Calvin Chess Trainer or Chess Notation Fluency have ads?

Neither Calvin Chess Trainer nor Chess Notation Fluency shows ads.

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

Calvin Chess Trainer ships an update every 5 days, and Chess Notation Fluency every 3 days. Most recently, Calvin Chess Trainer was updated on October 3, 2026 and Chess Notation Fluency on October 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.*