Productivity
Kaku
Last updated 2026-07-15 · benchmark measured 2026-07-15 — deterministic & reproducible
Kaku is a desktop app that corrects Japanese grammar, particles, keigo, and tone.
Is Kaku production-ready?
Legit.Show ran its deterministic 7-Frame production-readiness benchmark on Kaku (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Security; its weakest is Privacy. The per-frame breakdown is public on the Legit.Show listing; the single overall production-readiness score is reserved for the verified maker.
The 7 Frames
- Performance — 84/100
- Accessibility — 96/100
- Security — 100/100
- Privacy — 75/100
- Reliability — 100/100
- Standards — 92/100
- Discoverability — 100/100
What we measured
- Security headers present: CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy.
- Served over HTTPS with a valid certificate.
- Real Lighthouse performance run — 249 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.
- Discoverable: structured data, sitemap, OpenGraph image, canonical URL.
Who it's for
Japanese language learners · Professional writers · Business communicators · International professionals · macOS and Windows users
Pricing
Free (5 AI rewrite credits/day) or Pro at $7.17/month (5 free credits/day + 2,000 monthly credits)