ChessAtlas vs Shared Forest
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 Shared Forest
| Detail | 
ChessAtlas | SF
Shared Forest |
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| What it does | Free chess opening trainer with spaced repetition
| Plant a tree in a forest we all grow
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| Stage | Not given
| Established
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| Founded | Not given
| Not given
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| Based in | Not given
| DE
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| Pricing model | Freemium
| Freemium
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| Pricing | Not given
| Free to plant one tree per day without an account. Optional paid tree sponsorships available with a 12-month term.
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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
| - Plant one free tree per day
- Six tree growth stages from grass patch to ancient tree
- Grove formation when ancient trees stand close
- AI agent support through public HTTP API and MCP servers
- Real-time forest updates via WebSocket
- Visitor counts for people and AI agents separately
- Interactive map with explore controls
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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
| - Distinguishes AI agent traffic from human traffic with visible crystal trees
- No account required for free planting or visiting
- Privacy-first design with no persistent identifiers for free users
- Keyless API and MCP servers for AI integration
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| Free plan | Not given
| Not given
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| Open source | Not given
| Not given
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| Platforms | Not given
| 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 | 4 ▼ −1 (down) since last check |
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| Trust Flow (Majestic) | 22 | 0 |
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| Citation Flow (Majestic) | 24 | 24 |
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| Referring domains (Majestic) | 34 | 66 |
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4 details filled in for both companies.
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