v1.0 — RUM · AI root cause · benchmarks · runtime profiling

See, explain, and fix the real performance of any web application.

Pulse captures Web Vitals, network, runtime memory, FPS, long tasks and JS errors from real user sessions — then uses AI to pinpoint root cause and benchmark you against every other project.

One snippet, or a Chrome extension for sites you don't own.
AI root cause for LCP, INP, CLS — with the actual fix.
Cross-project benchmarks at p50 / p75 / p95.

install.html

<!-- paste in <head> of your site -->
<script src="https://pulse.app/sdk.js"
        data-project-key="pk_live_xxxxxxxxxxxxx" async></script>

// captured automatically from every session — click any card to learn more

// what makes Pulse different

From raw telemetry to a fix you can ship — in one product.

AI Root Cause

Per-vital breakdown of what's actually hurting LCP, INP and CLS — weighted contributing factors, evidence per session, and a one-line fix. Now considers heap pressure, DOM weight and FPS too.

See root cause

Benchmarks with AI summary

Compare your project to the whole Pulse fleet at p50/p75/p95. The AI explains where you sit, why, and what to fix first — including runtime findings.

Open benchmarks

Runtime profile

Heap used vs total, DOM node growth, FPS distribution and cumulative long-task minutes — with a leak detector that flags sessions by regression slope.

View runtime

Trends & measurement

Track p75 of every vital over time, slice by device, network and route. Spot regressions the moment they ship.

Open dashboard

Chrome extension

Audit any site you don't own. Live overlays, session capture and the same root-cause engine — no SDK required.

Get the extension

One-line SDK

Drop a single async script in <head>. Captures vitals, network, runtime, errors — including logged-in flows — with no perf cost.

Quick start