Education & Reference
D4 Chess
Last updated 2026-07-01 · benchmark measured 2026-08-09 — deterministic & reproducible
AI-powered chess coaching platform built for club-level players.
Is D4 Chess production-ready?
Legit.Show scores D4 Chess 87 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on D4 Chess (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Privacy; its weakest is Security. Every frame it averages is published with its evidence on the Legit.Show listing.
The 7 Frames
- Performance — 75/100
- Accessibility — 90/100
- Security — 45/100
- Privacy — 100/100
- Reliability — 100/100
- Standards — 100/100
- Discoverability — 100/100
What we measured
- Security headers present: HSTS.
- No Content-Security-Policy.
- Served over HTTPS with a valid certificate.
- Real Lighthouse performance run — 196 ms to first byte.
- Returns a proper 404 for unknown routes.
- 3 of 3 sampled routes reachable.
- Has a reachable privacy policy.
- Sets cookies / loads scripts with no consent prompt.
Who it's for
Club players · Chess learners · Intermediate players · Players wanting to improve · Casual to competitive players
Pricing
Free plan ($0 forever); Premium $5.99/month with 7-day money-back guarantee
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