# Prairial vs ChessMaster

The clearest difference is price: ChessMaster at Free against Prairial's $0.99. ChessMaster also leads on update cadence (every 3 days vs every 6 months). Prairial's advantage is in-app purchases (none vs 3). On ads, device support and iOS requirement there is nothing between them.

ChessMaster is free to download; Prairial costs $0.99 up front. ChessMaster sells 3 in-app purchases, starting at $6.99 per month. Prairial asks for nothing beyond the download.

Prairial ships an update every 6 months, ChessMaster every 3 days. The most recent releases landed on October 23, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Prairial | ChessMaster |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.3 (3 ratings)](https://appshunter.io/ios/app/prairial/id697920083/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 days** |
| Monetization | Paid | — |
| Size | 4 MB | 52 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Laurent Rodier](https://appshunter.io/developer/697920086) | [Miron Brinkovskii](https://appshunter.io/developer/1794755046) |

## What reviewers say

### Prairial

[App page](https://appshunter.io/ios/app/prairial/id697920083)

This utility converts between the standard Gregorian calendar and the historical French Revolution calendar. It offers a widget for the current date in the Revolutionary era and an Apple Watch companion with dual display options, including decimal time.

**Highlights:** Gregorian to French Revolution calendar conversion, Today screen widget, Apple Watch companion app, Decimal time display, Standard image representation of months

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### ChessMaster

[App page](https://appshunter.io/ios/app/chessmaster-play-better/id6741578143)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChessMaster Pro Monthly | $6.99 | per month |
| ChessMaster Pro Three Months | $14.99 | per 3 months |
| ChessMaster Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is Prairial free?

Prairial costs $0.99, with no in-app purchases.

### Is ChessMaster free?

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

### Do Prairial or ChessMaster have ads?

Neither Prairial nor ChessMaster shows ads.

### Which is updated more often, Prairial or ChessMaster?

Prairial ships an update every 6 months, and ChessMaster every 3 days. Most recently, Prairial was updated on October 23, 2026 and ChessMaster on October 18, 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.*