Tool directory
Every tool is free, rate-limited, and logged for abuse protection — not behind a paywall.
Performance and page weight
Page Weight Breakdown
Estimate HTML + sampled asset transfer weight.
Compression Tester
Probe gzip/Brotli Content-Encoding with Accept-Encoding negotiation.
Render-blocking Resources
Find potentially render-blocking CSS/JS in the HTML.
Font / CLS Risk
Flag font-display, preload, and web-font patterns that risk CLS.