ChessAtlas vs Spellfort

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 Spellfort
Detail	ChessAtlas	Spellfort
What it does	Free chess opening trainer with spaced repetition	Voice-controlled games for the edge of sleep
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	Voice-controlled gameplay with no visual interface Trivia battles Animal mysteries Sound games Memory journeys Riddles Interactive tales Game master narration Sign in with Apple account support
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	Eyes-closed gameplay that minimizes screen time Designed for the hypnagogic state between waking and sleep Short adventures suitable for end-of-day play No complex controls required
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	0
Citation Flow (Majestic)	24	17
Referring domains (Majestic)	34	7

4 details filled in for both companies.