ChessAtlas vs Wordspool

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

ChessAtlas compared with Wordspool
Detail	ChessAtlas	Wordspool
What it does	Free chess opening trainer with spaced repetition	Thread the Meaning
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Free
Pricing	Not given	Not given
Key features	Spaced repetition with FSRS algorithm Repertoire builder Opening trainer with instant feedback Game import from Lichess and Chess.com Deviation detection Course library with opening courses iOS and Android mobile apps Multiple language support	New puzzle every 24 hours Par scoring system Sharable puzzle codes Optional weekly leaderboard Browser-based, no download Machine-learned word relationships No letters, spelling or grid
What makes it different	FSRS algorithm schedules reviews 15-30% more efficiently than SM2 Automatic deviation detection from Lichess and Chess.com games Full repertoire builder in free tier with no course purchase required	Walks the distance rather than guesses it Measures meaning not spelling No account or signup required Open source vocabulary datasets
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)	10 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	22	4
Citation Flow (Majestic)	24	13
Referring domains (Majestic)	34	4

4 details filled in for both companies.