Frontend tools
Web Vitals, color contrast, CSS specificity, and React hook dependencies.
Bundle Size Budget Calculator
Bundle size, connection speed, and target load time - is your JS bundle within budget.
CSS Specificity Calculator
Paste a CSS selector - IDs, classes, and elements broken down, plus the specificity score.
Color Contrast Checker
Two colors to the exact WCAG contrast ratio, and whether it passes AA and AAA.
Core Web Vitals Checker
LCP, INP, and CLS against Google's published thresholds - Good, Needs Improvement, or Poor.
React useEffect Dependency Checker
Paste a useEffect/useMemo/useCallback call - identifiers used vs declared deps, mismatches flagged.
Browser Bookmarklet Generator
A small safe preset list, turned into a draggable javascript: bookmarklet.
See this same kind of analysis applied to your whole repository
Call graphs, dead code, blast radius, and a health score. Results in 60 seconds, free.