Education & Reference
Capo
Last updated 2026-07-05 · benchmark measured 2026-08-09 — deterministic & reproducible
Capo displays chords and scales on an interactive fretboard for stringed instruments.
Is Capo production-ready?
Legit.Show scores Capo 71 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on Capo (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Reliability; its weakest is Security. Every frame it averages is published with its evidence on the Legit.Show listing.
The 7 Frames
- Performance — 81/100
- Accessibility — 91/100
- Security — 10/100
- Privacy — 25/100
- Reliability — 100/100
- Standards — 92/100
- Discoverability — 100/100
What we measured
- No Content-Security-Policy and no HSTS.
- Served over HTTPS with a valid certificate.
- Real Lighthouse performance run — 1994 ms to first byte.
- Returns a proper 404 for unknown routes.
- 3 of 3 sampled routes reachable.
- No privacy policy found.
- Sets cookies / loads scripts with no consent prompt.
- Discoverable: structured data, sitemap, OpenGraph image, canonical URL.
Who built it
Martijn van der Eijk
Who it's for
guitarists · bass players · ukulele players · mandolin players · music students
Pricing
Free with Capo Plus subscription for ad-free practice and advanced features
Visit Capo → · Alternatives to Capo → · How this was measured →