ChessAtlas vs Quads
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 Quads
| Detail | 
ChessAtlas | 
Quads |
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| What it does | Free chess opening trainer with spaced repetition
| Don't hand them the win
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| Stage | Not given
| Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Freemium
| Freemium
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| Pricing | Not given
| Free to play with ads. Optional one-time purchase to remove ads, and separate purchase to unlock two extra board themes.
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| 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
| - Pass-and-play for two players on one device
- Daily puzzle
- Challenge a friend with puzzle codes
- Eight language support
- Fully offline gameplay
- Tablet-optimized layout
- Optional ad-free upgrade
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| 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
| - Your opponent chooses the piece you place, creating unique strategic tension
- Playable completely offline with no account required
- Challenge friends asynchronously using puzzle codes
- Five AI difficulty levels including unlockable Grandmaster mode
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| Free plan | Not given
| Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
| Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 17 ▲ +1 (up) since last check | 1 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 22 | 4 |
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| Citation Flow (Majestic) | 24 | 15 |
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| Referring domains (Majestic) | 34 | 4 |
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4 details filled in for both companies.
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