What SyteCheck checks
One scan runs ten separate checks against a page and scores each out of 100. Every finding says what the problem is, why it matters, and the specific change that fixes it. Here is what each category looks at.
The ten categories
Accessibility
Can everyone use your site, including those with visual, auditory, or other impairments? We run axe-core — the engine behind most professional accessibility tooling — against WCAG 2.1 AA and score the violations by severity: images with no description, text too faint to read, form fields with no label, and controls a keyboard cannot reach.
Performance
How fast the page actually feels. A full Lighthouse audit measures the Core Web Vitals that Google uses, alongside first paint, blocking time, and speed index, and lists the specific savings available on this page.
SEO Fundamentals
The fundamentals search engines look for: a title and description that exist and are the right length, a sensible heading structure, canonical tags, Open Graph and Twitter Card tags for when someone shares your link, descriptive image filenames and alt text, and a clean URL structure.
Security Headers
The HTTP headers that protect your visitors — Content-Security-Policy, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy. Missing ones are cheap to add and are usually the first thing a security review picks up.
Broken Links
We scan the page and test as many links as possible for validity. You get the ones that error, the ones that have quietly turned into redirect chains, and the ones pointing at something that no longer exists.
Visual Analysis
The part no other audit tool does. We take real screenshots at phone, tablet, and desktop sizes and have them reviewed for design: typography and readability, use of whitespace, colour palette, visual hierarchy, how clearly your main call to action stands out, and whether the design and layout still look current.
Responsive Design
How the page holds up on a phone (375px), a tablet (768px), and a desktop screen (1440px): content running off the edge of the screen, a missing viewport tag — the one line of code that tells a phone how to size the page — and buttons or links too small or too close together to tap reliably.
HTML Validation
Markup validity against the W3C validator — unclosed and mis-nested elements, deprecated tags, duplicate IDs, and attributes that do not belong. Browsers paper over most of this, which is exactly why it goes unnoticed for years.
AI Visibility
How legible your site is to AI assistants: Schema.org structured data, whether robots.txt lets crawlers like GPTBot and ClaudeBot in, an llms.txt file, complete Open Graph tags, and the About, Contact, and Privacy pages that establish who you are.
Content Freshness
The signals that quietly tell a visitor a site has been left alone — a copyright year stuck in the past, an HTTPS certificate near expiry, a CMS version disclosed in the page source, and "last updated" dates that stopped moving.
What you get back
A score, and the reasoning behind it
Every category is scored out of 100 and rolled into one overall number, weighted so the things that affect real visitors count for more. A short executive summary says what it all amounts to in an easy-to-read paragraph.
Findings, in priority order
Each finding is rated critical, warning, or informational, and carries the offending snippet where there is one. We give you an explanation and actionable steps to fix each issue.
A report you can hand over
Paid plans export the whole report as a PDF, and your scan history is kept so you can re-run a scan after the fixes land and see the score move. Reports are available in twelve languages.
What SyteCheck does not do
Worth knowing before you sign up, because the tools that hide this are the ones that disappoint you later.
See it against your own site
The free plan runs the visual critique, SEO, and content freshness checks on any page you own. That is enough to know whether the rest is worth paying for.
Free plan, no credit card. Verify your email and scan your first page.