Comparison

Solitaire Calculation SK vs Project Solitaire

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head

Solitaire Calculation SK

Solitaire Calculation

Ad Free Solitaire

About

Solitaire Calculation SK

Features

Read full description

*** UPDATE: All themes are free and unlocked now! *** This solitaire "Calculation" is very mysterious compared to the other solitaire games. Because all the combinations are solvable. The first time I met "Calculation" was over 30 years ago. Since then I have been playing and making this game as an app on various computers. About 7 years ago, I suddenly realized that I could solve all the combinations no matter how difficult it seemed. For easy ones, it takes only a few minutes. For hard ones, it may take hours, but in the end it can be solved. You just need to memorize it and think really hard. Sometimes make strategy. Just like chess.

About

Project Solitaire

Features

Read full description

Ad free & battery saving solitaire game!

Screenshots

Solitaire Calculation SK4 screens

Project Solitaire3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard3 real differences · 3 level

Solitaire Calculation SK versus Project Solitaire: the parameters behind the verdict, then further details
Parameter	Solitaire Calculation SK	Project Solitaire
Price	Free	Free
Update frequency	Every 6 weeks	Every 9 days — better
Ads	Yes	No — better
In-app purchases	Yes	No — better
Devices	iPhone	iPhone
Requires iOS	17.0	17.0
Further details — not scored
Size	5 MB	1 MB
Age rating	4+	4+
Developer	Bapple Tech	AYSE AKSAKAL

In-app purchases

1 purchases

Solitaire Calculation SK

One-time1

Donation$1.99

None

Project Solitaire

No in-app purchases

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.