ChessAtlas vs Build A Player
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 Build A Player
| Detail | 
ChessAtlas | 
Build A Player |
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| What it does | Free chess opening trainer with spaced repetition
| Sports builder game for creating and simulating NFL quarterbacks, wide receivers, and running backs
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Freemium
| Free
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| Pricing | Not given
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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
| - Build quarterbacks, wide receivers, or running backs from current NFL stars and all-time legends
- Nine-trait selection system with body map visualization
- Position-specific trait boards for each player type
- Classic mode with current NFL players
- All-Time mode featuring legendary players
- Deterministic simulation for reproducible results
- Shareable result pages with encoded picks and seed
- No account required, local browser storage for game progress
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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
| - Independent fan-made project with original ratings not copied from official leagues or commercial games
- Deterministic simulation enables reproducible results and same-board challenges with friends
- Complete fictional season simulation rather than stopping at cosmetic ratings
- Strategy-focused gameplay with meaningful opportunity cost for each decision
- Position-specific builds requiring different strategic approaches
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| Free plan | 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) | 10 ▲ +1 (up) since last check | 15 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 22 | 17 |
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| Citation Flow (Majestic) | 24 | 21 |
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| Referring domains (Majestic) | 34 | 67 |
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4 details filled in for both companies.
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