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8 hours ago
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See if your site meets 2025 web standards. Core Web Vitals, WCAG 2.2 Level AA, security headers, SEO, modern framework checks—47 checks in under 45 seconds.
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.
These standards exist for a reason. Google prioritises fast sites. Accessible sites reach more people. Secure sites build trust. When you meet modern standards, you see it in your traffic and conversions.
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.
47 automated checks across 6 categories
Modern Standards
Core Web Vitals, modern framework patterns, image optimisation. Checks if you're using current web standards or legacy patterns.
Performance
LCP under 2.5s, INP under 200ms, CLS under 0.1. Google uses Core Web Vitals as a ranking factor. Slow sites drop in search results.
SEO & AI Search
Meta tags, schema markup, XML sitemaps, semantic HTML. Checks schema.org and semantic structure that AI search engines use to understand your content.
Security
HTTPS config, security headers, CSP policies, SSL certificates. Modern browsers show warnings on insecure sites. Users leave before they see your content.
Accessibility
WCAG 2.2 Level AA compliance, keyboard navigation, screen reader support, colour contrast. 15% of people need accessibility features to use websites. In the UK, inaccessible sites violate the Equality Act 2010.
Code Quality
Total bundle size, render-blocking resources, console errors, image format checks. Developer-focused checks.
Three steps. Less than a minute.
Enter a URL
Any public website. Yours, a client's, a competitor's. Staging sites with accessible URLs.
We scan it
47 automated checks run in parallel. Takes about 45 seconds for a typical site.
You get a report
Overall score, issues by category, specific fixes. Shareable, exportable reports.
We're transparent about our limitations. Here's what GuardianScan can't do.
Source code or private repositories
We scan live websites via HTTP/HTTPS requests. We can't access your codebase, Git repos, or review application logic.
Backend security vulnerabilities
We check security headers and HTTPS configuration, but can't test for SQL injection, authentication flaws, or server-side vulnerabilities.
Business logic bugs
We can't test if your checkout process works or if forms submit correctly. We check technical standards, not functionality.
Full WCAG 2.2 compliance
Automated accessibility checks catch approximately 70% of issues. Manual testing with assistive technologies is still required for complete compliance.
Everything you need to know about GuardianScan
What does GuardianScan check?
47 checks across 6 categories. Performance covers Core Web Vitals (LCP, INP, CLS). Security checks HTTPS, headers, and CSP policies. Accessibility tests WCAG 2.2 Level AA compliance. SEO checks meta tags, schema markup, and semantic HTML. Modern Standards looks at framework patterns and optimisations. Code Quality covers bundle size and console errors.
How long does a scan take?
Under 45 seconds for most sites. The 47 checks run in parallel for speed. Scan duration may vary based on your site's performance and size.
Is there a free tier?
Yes. Free accounts get 1 scan per month. Enter a URL to get a full 47-point report with scan history. For unlimited scans, automated monitoring, and advanced features, upgrade to Professional.
How much does it cost?
£24/month for Professional (unlimited scans, monitoring, history). Agency plan at £79/month includes team collaboration and API access. Currently in pre-launch - sign up to get notified when we're ready.
What makes this different from Lighthouse?
We run Lighthouse for performance and accessibility scoring, then add security header checks, SEO validation, and framework-specific audits. Lighthouse covers part of the picture. We check everything that matters for modern websites - security, SEO, framework optimisation - in one scan with stored history.
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 and semantic HTML structure that AI search engines use to parse and understand 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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