Check Your Website Before Launch: WebAudit Inspector

A website can look perfectly fine.

Pages load, the design works and the content appears exactly where it should.

But that doesn't necessarily mean everything is technically correct.

A missing canonical tag, forgotten sitemap, broken heading hierarchy, dead link or incorrectly configured security header can easily go unnoticed — especially during a new launch, a migration or a fast AI-assisted development cycle.

WebAudit Inspector is a free Chrome extension designed to perform a quick technical audit of the page you're currently viewing.

Technical checks in one click

Instead of opening multiple dashboards and submitting URLs to different tools, WebAudit Inspector runs directly from your browser.

Open the page you want to inspect and launch the extension.

It analyzes the page across several categories and provides an overall score together with category-level results.

Checks include:

• robots.txt and sitemap.xml

• Meta descriptions and canonical tags

• Viewport configuration

• Open Graph and Twitter Card metadata

• H1–H6 heading structure

• Schema / structured data

• Missing image alt attributes

• HTTPS and HTTP → HTTPS redirects

• Mixed content

• CSP, HSTS, X-Frame-Options and X-Content-Type-Options

• llms.txt, llms-full.txt and ai.txt

• ads.txt, app-ads.txt and sellers.json

The idea is simple: get a quick picture of a page's technical health without constantly switching between tools.

Find broken links and redirects

One of the most useful features for No404 users is the built-in link scanner.

WebAudit Inspector can scan links on the current page and inspect their HTTP responses.

Results can be filtered into categories such as 2xx, 3xx, broken links and errors.

For redirects, the extension captures the actual HTTP status code, including:

301, 302, 307 and 308

It can also identify responses such as 404, 410 and 5xx.

This becomes particularly useful after website migrations, URL restructuring or content removal.

A page itself might work perfectly while still containing links pointing to URLs that no longer exist.

Heading structure is more than an H1 count

Checking whether a page contains an H1 isn't always enough.

WebAudit Inspector displays the full heading hierarchy from H1 through H6 and highlights skipped levels.

For example:

H1 → H2 → H4

makes it easy to spot the missing H3 level.

This is particularly useful when reviewing long-form content, landing pages and AI-generated websites.

Schema and image alt checks

The extension also detects structured data implemented through JSON-LD and microdata.

Detected types such as Article, Product, FAQ and BreadcrumbList can be quickly reviewed.

Image accessibility checks follow a similar approach.

Instead of simply reporting that several images are missing alt attributes, WebAudit Inspector can show which images need attention.

That makes moving from detection to correction much faster.

Checks for AI crawler files

Alongside traditional SEO checks, WebAudit Inspector also looks for files that are increasingly appearing in modern web projects:

• llms.txt

• llms-full.txt

• ai.txt

These are treated as bonus checks, so their absence doesn't negatively affect the overall score.

The same principle applies to publisher-related files such as ads.txt, app-ads.txt and sellers.json.

Why is this useful for vibe-coded websites?

AI-assisted development tools can produce a complete-looking landing page in minutes.

But visually complete doesn't necessarily mean technically complete.

A canonical tag may be missing.

The meta description may never have been added.

Heading hierarchy can be incorrect.

robots.txt or sitemap.xml may be misconfigured.

Images can be missing alt attributes.

Old or invalid URLs may still exist in the page.

That's why WebAudit Inspector isn't only useful for SEO professionals. It can also serve as a practical pre-launch sanity check for developers, indie hackers and teams shipping products quickly.

Where do WebAudit Inspector and No404 differ?

The two tools touch some of the same technical problems, but operate at different stages.

WebAudit Inspector is primarily an inspection and detection tool.

You open a page, audit its technical configuration and identify issues — including broken links.

No404 focuses on real 404 requests and lost traffic reaching your website.

In simple terms:

WebAudit Inspector → inspect and find the problem.

No404 → detect real 404 traffic, match it and redirect it to relevant live URLs.

The two approaches can complement each other particularly well during migrations or major URL changes: audit existing pages and links before launch, then monitor the 404 requests that real users and crawlers encounter after deployment.

Final thoughts

A website looking correct in the browser doesn't mean everything underneath it is correct.

Small issues involving metadata, schema, security headers or broken links can easily accumulate.

WebAudit Inspector is designed to make those issues visible through a quick browser-based audit.

It requires no account, supports both English and Turkish, and performs its checks directly through the browser.

For a quick technical sanity check before launching a new website, after a migration or before delivering an AI-generated project, it's a useful tool to keep in your browser.