# Openit vs Calvin Chess Trainer

The clearest difference is in-app purchases: Calvin Chess Trainer at none against Openit's 2. Calvin Chess Trainer also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Openit sells 2 in-app purchases, starting at $3.99 per month. Calvin Chess Trainer asks for nothing beyond the download.

Openit ships an update every 10 days, Calvin Chess Trainer every 5 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Openit | Calvin Chess Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/openit-chess-opening-trainer/id6749825647/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 5 days** |
| Monetization | Freemium | — |
| Size | 102 MB | 170 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Louis Raffin](https://appshunter.io/developer/1816724223) | [DAVID MARKLE](https://appshunter.io/developer/1880745263) |

## What reviewers say

### Openit

[App page](https://appshunter.io/ios/app/openit-chess-opening-trainer/id6749825647)

Learn chess openings through interactive play and guided lessons. This app offers a gamified approach to understanding and memorizing opening moves, with modes for learning and practice. Sharpen your chess strategy from the first move.

**Highlights:** Interactive opening library, Coach-guided explanations, Gamified progression with streaks, Practice mode for reinforcement, Learn popular chess openings

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Openit Pro Monthly | $3.99 | per month |
| Openit Pro Annual | $24.99 | per year |


### 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 Openit free?

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

### Is Calvin Chess Trainer free?

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

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

Neither Openit nor Calvin Chess Trainer shows ads.

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

Openit ships an update every 10 days, and Calvin Chess Trainer every 5 days. Most recently, Openit was updated on November 5, 2026 and Calvin Chess Trainer on October 31, 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.*