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Web Performance

7 free browser-based tools

Lighthouse, bundle, source map, cache, web vitals and image weight analysis

Lighthouse, bundle, source map, cache, web vitals and image weight analysis

All Web Performance

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Lighthouse JSON Viewer

Read Lighthouse report JSON and summarize scores, audits and Core Web Vitals findings.

Web Performance/Local

Bundle Analyzer Lite

Inspect webpack stats JSON for large assets, chunks and module size hotspots.

Web Performance/Local

Source Map Size Analyzer

Inspect source map JSON for source counts, embedded source content and rough weight signals.

Web Performance/Local

Web Vitals Calculator

Classify LCP, INP, CLS, FCP and TTFB values against current Core Web Vitals thresholds.

Web Performance/Local

Cache Header Analyzer

Analyze Cache-Control, ETag and Vary headers for browser and CDN caching behavior.

Web Performance/Local

Critical Request Chain Viewer

Build a best-effort critical request chain summary from HAR entries and initiators.

Web Performance/Local

Image Weight Analyzer

Analyze image URL/file manifests for total weight, largest assets and compression opportunities.

Web Performance/Local
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