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We built this to audit our own sites. Now you can use it.

Scan any website for performance issues, security gaps, and compliance failures. Get a report in 45 seconds.

  • Modern standards

    Core Web Vitals, modern framework patterns, security headers. Latest 2025 web standards.

  • 47-point check

    Performance, SEO, AI search readiness, accessibility (WCAG 2.2 Level AA), security. UK Equality Act 2010 compliant.

  • Plain English

    What's wrong and how to fix it. Developer-focused, actionable fixes.

Built by a developer,
tired of manual audits

Every project meant the same manual checks: Is the Lighthouse score good enough? Did I miss security headers? Is the schema markup actually working?

So I built GuardianScan. It runs the same checks I'd do manually, but finishes in under a minute.

I use it on every project now. Scan before launch, after deploys, whenever something feels off.

It checks modern web standards - Core Web Vitals, proper caching, image optimisation. Not just basic SEO stuff from 2015.

Scans live websites via HTTP. Won't catch everything - automated accessibility checks get about 70% of issues, and it can't analyse source code or private repos. But it catches most common problems fast.

If you build websites or care about how yours performs, this will save you time.

What gets scanned

47 automated checks across 6 categories

Modern Standards

Core Web Vitals, modern framework detection, image optimisation. Checks if you're using 2025 web standards or legacy patterns.

Performance

LCP under 2.5s, INP under 200ms, CLS under 0.1. Actual speed metrics that affect users and rankings.

SEO & AI Search

Meta tags, schema markup, XML sitemaps, semantic HTML. Optimised for Google and AI search engines (ChatGPT, Perplexity, SearchGPT).

Security

HTTPS config, security headers, CSP policies, SSL certificates. Catches common security gaps.

Accessibility

WCAG 2.2 Level AA compliance, keyboard navigation, screen reader support, colour contrast. UK legal requirement under UK Equality Act 2010.

Code Quality

Total bundle size, render-blocking resources, console errors, image format checks. Developer-focused checks.

Scan. See. Fix.

Three steps. Less than a minute.

  1. Enter a URL

    Any public website. Yours, a client's, a competitor's. Staging sites with accessible URLs.

  2. We scan it

    47 automated checks run in parallel. Takes about 45 seconds for a typical site.

  3. You get a report

    Overall score, issues by category, specific fixes. Shareable, exportable reports.

Made for people who build websites

Agencies

Check client sites before presenting work. Catch issues before the client does.

Freelancers

Quick health check before taking on a project. Know what you're dealing with upfront.

In-house teams

Scan after every deploy. Catch regressions before users do.

Frequently Asked Questions

Everything you need to know about GuardianScan

What does GuardianScan check?

47 automated checks across 6 categories: Modern Standards (Core Web Vitals, framework patterns), Performance (LCP, INP, CLS), SEO & AI Search (meta tags, schema, semantic HTML), Security (HTTPS, headers, CSP), Accessibility (WCAG 2.2 Level AA), and Code Quality (bundle size, console errors).

How long does a scan take?

About 45 seconds for a typical website. The 47 checks run in parallel for speed.

How much does it cost?

£24/month after launch. Currently in pre-launch - sign up to get notified when we're ready.

What makes this different from Lighthouse?

Lighthouse is excellent but technical. GuardianScan explains issues in plain English with actionable fixes. We also check modern framework patterns (Server Components, App Router), AI search optimisation (ChatGPT, Perplexity), and run recurring scans automatically.

Can it scan private or staging sites?

Yes, as long as the URL is accessible over HTTP/HTTPS. We scan via web requests, so the site needs to be reachable from the internet. We can't analyse source code or private repositories.

What's checked for accessibility?

WCAG 2.2 Level AA compliance including keyboard navigation, screen reader support, colour contrast (4.5:1 minimum), touch targets (48px minimum), and semantic HTML. Automated checks catch about 70% of issues - manual testing still needed for full compliance.

Does it work for AI search optimisation?

Yes. We check schema.org markup, semantic HTML structure, and content formatting that AI search engines (ChatGPT, Perplexity, SearchGPT) use to understand and cite your content.

How often should I scan my site?

Before launch, after major deploys, and whenever something feels off. Many developers run weekly scans to catch issues early. Post-launch, we'll offer automated recurring scans.

Free. No spam. One email when ready.

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