AI & Agents
Excalibur
Last updated 2026-07-06 · benchmark measured 2026-08-09 — deterministic & reproducible
Open-source AI coding agent that covers the full product cycle, not just code edits.
Is Excalibur production-ready?
Legit.Show scores Excalibur 88 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on Excalibur (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 — 93/100
- Accessibility — 92/100
- Security — 45/100
- Privacy — 100/100
- Reliability — 100/100
- Standards — 100/100
- Discoverability — 87/100
What we measured
- Security headers present: X-Content-Type-Options, Referrer-Policy.
- No Content-Security-Policy and no HSTS.
- Served over HTTPS with a valid certificate.
- Real Lighthouse performance run — 200 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 built it
Rafael Casuso (@Rafael_Casuso) · product account @getExcalibur
Who it's for
Product engineers · Development teams · Startups · Enterprise organizations · Individual developers
Pricing
Core: Free forever (Apache-2.0). Enterprise: Custom pricing based on seats and usage
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