Lighthouse

An open-source auditing tool that scores performance, accessibility, best practices and SEO in a lab environment.

Run it in CI against key templates so regressions are caught in a pull request rather than in a quarterly audit.

Treat the SEO category as a checklist of basics — it confirms tags exist, not that the strategy is right.

A repeatable lab test is what makes performance a standard the team can hold, instead of a debate.

Its accessibility audit catches issues that also affect how crawlers parse a page.