Runs in your browser. Nothing is uploaded.
Small tools for the checks web teams keep doing by hand.
Each tool does one job, explains the rule behind every finding, and links the official source.
The tools
- SEO
hreflang checker
Paste hreflang annotations and get precise errors, warnings and a corrected snippet.
Open tool
- Analytics
dataLayer validator
Validate a GA4 / GTM event against a schema and catch personal data before it ships.
Open tool
- Accessibility
Theme and contrast lab
Build light, dark and high-contrast themes from tokens, with live contrast ratios.
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- Performance
INP stress test
Slow a page down on purpose, measure interaction latency, and try fixes.
Open tool