Spider Solitaire vs ChimpTest

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Spider Solitaire compared with ChimpTest
Detail	Spider Solitaire	ChimpTest
What it does	Free online card game with no download or account required	A free memory game inspired by Ayumu the chimpanzee at Kyoto University
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Free
Pricing	Not given	Not given
Key features	1, 2 and 4 suit difficulty levels Touch and mouse controls Keyboard shortcuts	Progressive levels that add numbered squares Flash window shrinks as difficulty increases Three-strike game over system Local browser storage of scores Challenge links with shared level difficulty Customizable flash speed via URL parameter
What makes it different	No download or account required to play Works on any device with a modern web browser Game progress saved automatically in browser Unlimited undo to explore strategies risk-free Multiple difficulty levels for all skill levels	Based on genuine peer-reviewed research from Kyoto University's 2007 Ayumu experiment No account, no download, no personal data collection Includes detailed educational articles about the original experiment and memory science
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	14 +13 (up) since last check	6 no change since last check
Trust Flow (Majestic)	0	6
Citation Flow (Majestic)	10	20
Referring domains (Majestic)	3	3

4 details filled in for both companies.