Free · no signup · results in under 2 min

Know exactly why your site is slow.

Not a score — a diagnosis. Lighthouse, Core Web Vitals, a full request waterfall, a filmstrip, and a fix list that names the exact files.

Real Chrome · Lighthouse v12 · CrUX field data

64
LCP
3.1s
TBT
410ms
CLS
0.08
FIX 1 Serve hero-banner.jpg as AVIF and preload it — it’s your LCP element.
Example report: performance score 64, LCP 3.1 seconds, TBT 410 milliseconds, CLS 0.08, with a request waterfall and the top fix.

Other tools give you a number. We show you what to fix.

Which resource is the problem, what it’s costing you, and how much faster the page could be — in one shareable report.

01

Lighthouse performance

The Lighthouse v12 performance score and every audit behind it, run in real Chrome.

02

Core Web Vitals, lab + field

TTFB, FCP, LCP, TBT and CLS from the test, beside CrUX real-user data.

03

Request waterfall

Every request in order with full timing, so the oversized image can’t hide.

04

Visual filmstrip + video

Frame by frame, with TTFB, FCP and LCP marked on the timeline.

05

LCP element analysis

A screenshot and details of your Largest Contentful Paint element.

06

Prioritized fixes

The exact files, sizes and expected savings — not “optimize images”.

Request waterfall

Find the slow third-party script in one glance.

Every request in order with connect, wait and download timing, transfer size, and a flag on anything that blocks rendering — so the culprit is the long bar, not a guess.

Connect Waiting Download
Example request waterfall with eleven requests; render-blocking CSS and JavaScript are flagged, and hero-banner.jpg has the longest download.

Share

A fast site deserves a receipt.

Every report lives at its own link for 90 days and comes with a share image showing the score and vitals — ready for a client email, a ticket or a team channel.

A share image for every report

A 1200×630 card with the score, the page and its vitals, generated when the test finishes.

One link per report

Anyone with the link can open it — no account. Results stay up for 90 days.

History without an account

Tests you run are listed for this browser, so last week’s baseline is one click away.

  • 96 shop.example.com/ Today
  • 71 shop.example.com/products/ Yesterday
  • 48 blog.example.com/ Last week

Three steps. Zero friction.

  1. 01 — Enter your URL

    Paste any URL. We handle normalization, redirects and protocol detection.

  2. 02 — We run the test

    A real Chrome browser runs Lighthouse and captures network data, screenshots and video.

  3. 03 — Get your report

    Scores, metrics, waterfall, filmstrip, video and fixes — ready in under 2 minutes.

Built for how teams actually work

View all use cases
Core Web Vitals test Lab and field data side by side. Lighthouse audit The full audit without installing the CLI. Page load analysis Waterfall, filmstrip and per-resource timing. E-commerce speed Find the scripts and images costing sales. Agency client reports One shareable URL per client. Pre-deploy testing Compare before and after every deploy.

debugutils Pro

Coming soon

Keep it fast after you fix it.

Scheduled tests, budgets in CI, real-user vitals and uptime — so regressions get caught before users notice.

Early access when it opens. Free speed tests always stay free.

Scheduled runs

Daily, weekly or custom intervals, with trends and regression alerts.

CI/CD budgets

Set budgets and fail the build when performance degrades.

Real user monitoring

A small snippet for real Core Web Vitals by device, connection and region.

Uptime monitoring

Multi-region checks with alerts to email, Slack and webhooks.

Find out what’s slowing you down.

Results are shareable via URL and stored for 90 days. No account needed.