Observed arrival · 2026-08-21

headlint: a full audit of your page’s <head>

headlint.dev Observed source

Editorial interest 84/100 Selection signal · not a rating of the site

A free web, CLI, and API toolkit that checks meta tags, social previews, favicons, redirects, robots rules, hreflang, and structured data.

Landing page captured for the 2026-08-21 issue.

Why it surfaced

headlint does more than count tags: it fetches and verifies the things a page declares, measures title truncation in real pixels, decodes favicons, checks hreflang return links, and shows the arithmetic behind its graded report. The tool also audits itself, with no signup and no stored uploads.

A free web, CLI, and API toolkit that checks meta tags, social previews, favicons, redirects, robots rules, hreflang, and structured data.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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The Missing Knob Bulletin

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