ChessAtlas vs Krillion Unlimited
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 Krillion Unlimited
| Detail | 
ChessAtlas | 
Krillion Unlimited |
|---|
| What it does | Free chess opening trainer with spaced repetition
| Free endless rare-answer trivia game you play in your browser
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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
| Free
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| Pricing | Not given
| 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
| - Solo dives with 7 prompts at 25 seconds each
- Scoring by answer rarity from 10 to 100 points
- Unlimited dives with no daily limit
- Themed packs: Geography, Movies, and Sports
- Multiplayer Puffer Party with up to 6 players
- 1 vs 1 ranked duels with ELO rating
- No download required, plays on any browser
- Hand-graded answer bank with 1,026 prompts and 35,000+ answers
- Progress saves without account required
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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
| - Truly free with no paywall or daily limit unlike the official Krillion game
- Rare answers score 10 times more than common answers
- Independent game with own question bank and artwork
- Ocean-themed depth scoring system up to 7,000 metres
- Player suggestions for answers integrated into growing answer bank
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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) | 17 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 22 | 6 |
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| Citation Flow (Majestic) | 24 | 12 |
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| Referring domains (Majestic) | 34 | 6 |
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4 details filled in for both companies.
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