Legit.Show measured Kern's Security frame at 100/100. Security headers present: CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy. Served over HTTPS with a valid certificate.

How does Legit.Show measure Kern?

Legit.Show scores seven frames — Performance, Accessibility, Security, Privacy, Reliability, Standards and Discoverability — deterministically from the public surface (URL, HTTP headers, real Lighthouse), with no LLM in the scoring path. See legit.show/methodology.

Productivity

Kern

Last updated 2026-10-21 · benchmark measured 2026-10-21 — deterministic & reproducible

A to-do app for iPhone and Mac that integrates directly with Claude AI.

92/100

7/7 frames

Top 10% of 17,127 measured · #5 of 56 in to-do list app

Legit Benchmark — the simple average of 7 measured frames. Frames we could not measure are left out of the average, never counted as zero. Every frame is shown below with its evidence.

Checked 2026-10-21 · scores move as sites change

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To cite this score: legit.show/s/kern-do/2026-10-21. That address never changes; this page moves with every re-measure.

Legit.Show scored Kern 92/100 on 2026-10-21, measured across all 7 frames from its public surface. legit.show/s/kern-do/2026-10-21

Is Kern production-ready?

Legit.Show scores Kern 92 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on Kern (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Accessibility; its weakest is Privacy. Every frame it averages is published with its evidence on the Legit.Show listing.

The 7 Frames

Performance — 95/100
Accessibility — 100/100
Security — 100/100
How this compares across the catalogue: The Web Security Baseline
Privacy — 70/100
How this compares across the catalogue: The Privacy Gap
Reliability — 100/100
Standards — 92/100
Discoverability — 85/100

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 — 226 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: sitemap, OpenGraph image, canonical URL.

Who it's for

iPhone users · Mac users · Productivity enthusiasts · People wanting AI collaboration · Task management users

Pricing

Private beta - free to join

Sources and updates

Description: Taken from kern.do's own website on 2026-10-21.
Operator: Kern, as named in kern.do's terms, privacy page or footer.
Benchmark: Measured by Legit.Show from the live site, the way any visitor sees it — with no access to its code or accounts. Same method for every product, and no AI decides the score. Last checked 2026-10-21.

Put together from public information, without Kern's involvement. If anything here is wrong, tell us and a person will check it.

Visit Kern → · Alternatives to Kern → · How this was measured →