# Solitaire Calculation SK vs Project Solitaire

The clearest difference is in-app purchases: Project Solitaire at none against Solitaire Calculation SK's 1. Project Solitaire also leads on ads (none vs shown) and update cadence (every 9 days vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Solitaire Calculation SK sells 1 one-off in-app purchase. Project Solitaire asks for nothing beyond the download.

Solitaire Calculation SK ships an update every 6 weeks, Project Solitaire every 9 days. The most recent releases landed on October 5, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Solitaire Calculation SK | Project Solitaire |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 9 days** |
| Size | 5 MB | 1 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Bapple Tech](https://appshunter.io/developer/1487666595) | [AYSE AKSAKAL](https://appshunter.io/developer/1810667738) |

## What reviewers say

### Solitaire Calculation SK

[App page](https://appshunter.io/ios/app/solitaire-calculation-sk/id1487666596)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation | $1.99 | one-time |


### Project Solitaire

[App page](https://appshunter.io/ios/app/project-solitaire/id6756858404)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Solitaire Calculation SK free?

Solitaire Calculation SK is free to download, with in-app purchases available.

### Is Project Solitaire free?

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

### Do Solitaire Calculation SK or Project Solitaire have ads?

Solitaire Calculation SK shows ads; Project Solitaire does not.

### Which is updated more often, Solitaire Calculation SK or Project Solitaire?

Solitaire Calculation SK ships an update every 6 weeks, and Project Solitaire every 9 days. Most recently, Solitaire Calculation SK was updated on October 5, 2026 and Project Solitaire on October 16, 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.*