Scanverra
Browser Test

See your site
exactly as users do

A real browser loads your page, captures every error, measures Core Web Vitals, and runs a mobile compatibility pass. Find what your users find - before they do.

Test your site free
example.com/browser-test
88A
Browser HealthGood

1.8s

LCP

0.02

CLS

180ms

TBT

Full page screenshot
0 console errors 2 broken links Mobile pass complete

What you get

A real browser session, not a static HTML parse.

Real browser rendering

We load your page in a real browser - not a parser, not a headless simulator. What we capture is exactly what your users see.

Console errors & JS exceptions

Every JavaScript error, unhandled promise rejection, and failed resource load is captured and shown with its full stack trace.

Core Web Vitals & performance

LCP, CLS, TBT, TTFB, and FCP - measured in a real browser session, not a lab estimate. Scored against Google's thresholds.

Mobile compatibility test

A second pass at 375px mobile viewport: viewport meta check, touch target sizes, horizontal overflow, font sizes, and a mobile screenshot.

How it works

Real browser. Real results. No setup.

Enter a URL

Paste any public URL. We launch a real browser session - desktop viewport, full JavaScript execution, no mocking.

Desktop + mobile pass

The browser loads your page at desktop size, waits for network to settle, then runs a second mobile pass at 375px.

Review the full report

Screenshots, Core Web Vitals, console errors, mobile compatibility, accessibility issues, tech stack - all in one report with AI analysis.

Full check list

24 signals captured across desktop and mobile in a single session.

Full page screenshot (desktop)
Mobile screenshot (375px viewport)
Console errors & warnings
JavaScript exceptions & stack traces
Unhandled promise rejections
Largest Contentful Paint (LCP)
Cumulative Layout Shift (CLS)
Total Blocking Time (TBT)
Time to First Byte (TTFB)
Failed & slow network requests
Large resource detection
Broken link crawl
Form validation issues
Image alt attribute check
Framework & CMS detection (35+ stacks)
Viewport meta & mobile compatibility
Touch target size check
Horizontal overflow detection
Accessibility violations (ARIA, contrast, focus)
AI summary & fix suggestions
Lazy-loaded image detection & validation
Console warnings & deprecation notices
Unsafe & mixed-content link detection
Duplicate element ID detection

Related reading

Finding Broken Links and JavaScript Errors Before Your Users Do

Why dead links and silent console errors quietly cost you conversions and SEO trust, and how to catch them before launch.

Debugging JavaScript Console Errors: A Practical Troubleshooting Guide

Reading a stack trace, telling your bug from a third-party script's bug, and a repeatable workflow for the errors that show up most often.

Cross-Browser Testing: A Practical Guide for Small Teams

You don't need an enterprise device farm to catch most cross-browser bugs - a tiered testing strategy that fits a small team's actual budget and time.

Website Audit

Performance, SEO & accessibility

Security Scanner

Headers, secrets, SSL & CSRF risk

Repo Scanner

Code quality & dependency health

Free - no sign-up needed

Catch bugs before your users do

A real browser session - desktop and mobile - with results in seconds.

Run browser test