Paste any URL. Get a full Lighthouse audit, Web Vitals, Network Waterfall, Visual Filmstrip, and AI-powered insights all in one place.
Sightline combines automated auditing, AI analysis, and interactive visualizations in a single workflow — no plugins, no config.
Full Lighthouse v12 audit. Performance, Accessibility, Best Practices, and SEO scores in one click.
Real-time Web Vitals: LCP, FCP, CLS, TBT, Speed Index and TTI displayed with Google's official thresholds.
Animated arc gauge showing your performance score with color-coded severity. At a glance, know exactly where you stand.
Interactive waterfall chart showing every network request, TTFB, latency and transfer size with filter and zoom controls.
Frame-by-frame loading timeline. See exactly how your page renders with screenshots captured during a live audit.
Gemini AI analyses your specific metrics and generates actionable insights sorted by High / Medium / Low severity.
Interactive sliders to simulate JS reduction, image optimization and server improvements, predict your score gain instantly.
Every audit is saved and accessible from your personal history. Track performance regressions or improvements over time.
Generate a secure public link for any report. Expiry-protected, token-based sharing with view-count tracking.
Test from a real Desktop or Mobile viewport with configurable network throttling (4G, Fast 3G, Slow 3G).
Multi-category score grid showing Performance, Accessibility, Best Practices and SEO scores with animated progress bars.
Real numeric data — not just scores. See exact millisecond timings and byte sizes for every metric on the report.
Every audit generates a rich, multi-panel report. Here is a preview of the key visualization panels.
Category Scores
Join developers who use Sightline to find and fix performance bottlenecks before users notice them.