Free tool
Free website analyzer
Analyzer by Lusivision reads what a browser, a search engine and an AI agent actually receive from your site — then tells you, with evidence, what to change. One URL, seven checks, no sign-up.
The checks we run before we ship
Every site we build passes the same review before it goes live: is it fast, is it usable, is it secure, can a search engine read it, does it leak visitors to third parties, and can a machine make sense of it. We got tired of doing that with a dozen scattered tools, so we built one.
Analyzer is that review, made public and free. It fetches your page once the way a browser would, reads the headers, the HTML and the TLS certificate, samples a bounded set of linked resources, robots.txt, the sitemap and your DNS records — and reports what it found, ranked worst first, with the evidence behind each finding.
There is no account, nothing is stored on our side, and your site's JavaScript is never executed. What you see is what a crawler or an agent sees on its first request.
Seven angles on one fetch
Run the Analyzer once and every check below reports on the same response. Each has its own page if you want to go straight to it.
Website Performance Checker
Time to first byte, compression, caching headers, page weight, lazy-loading and render-blocking assets — measured from a real HTTP fetch, not a simulation.
Open checker – Website Performance CheckerAccessibility Checker
Automated checks on images, heading order, form labels, link text, page language and the ARIA mistakes we see most often in production.
Open checker – Accessibility CheckerWebsite Security Checker
HTTPS and the TLS certificate, security headers, cookie flags, mixed content, SPF and DMARC records, and whether you publish a security.txt.
Open checker – Website Security CheckerOn-page SEO Checker
Title and description, canonical URL, a single descriptive H1, structured data, Open Graph tags, image alt text, robots.txt — including which AI crawlers it blocks — and your sitemap.
Open checker – On-page SEO CheckerPrivacy & Compliance Checker
Trackers and analytics, consent tooling, the cookies set before anyone clicks anything, third-party hosts, Google Fonts and embeds. Built with the GDPR in mind.
Open checker – Privacy & Compliance CheckerAgent Readiness Checker
How well AI agents can discover, read and use your site: content that survives without JavaScript, real 404s, an llms.txt, documented APIs, MCP. Powered by Is Agentic.
Open checker – Agent Readiness CheckerTechnology Detector
Signature-based detection of the CMS, framework, e-commerce and payment stack, consent tooling, analytics, CDN and hosting behind a site — each with the evidence that identified it.
Open checker – Technology DetectorHonest about its limits
A score is only useful when you know what it measures. Here is exactly where Analyzer's boundaries sit.
What it does
- Reports what a browser, crawler or agent receives on the first request
- Ranks failures first and shows the evidence behind every finding
- Scores delivery and markup with our own Lusivision Score
- Works on any public URL, with no account and no setup
- Keeps results in your browser tab and nowhere else
What it is not
- Not Google Lighthouse — no lab device metrics, no LCP or CLS
- Not a WCAG certification; automated checks cannot replace testing with people
- Not a penetration test — it reads posture, it never probes for vulnerabilities
- Not a ranking predictor, and it does not look at backlinks
- Not a headless browser — your JavaScript is never executed
Analyzer by Lusivision
Opens analyzer.lusivision.com — free, no account required.
Questions before you read the score
Is it really free?
Yes. Analyzer is free to use, with no account, no trial and no usage tier. We built it for our own work and publishing it costs us very little.
Do you store the sites I scan?
No. There is no account and no database behind it. Results live in your browser's session storage until you close the tab, and then they are gone.
Is this Google Lighthouse?
No. The Lusivision Score is our own assessment of how a page is delivered and marked up, based on an HTTP fetch and an HTML parse. It does not report LCP, CLS or lab device scores, and it is not a substitute for Lighthouse where you need those.
Is the security check a penetration test?
No. It reads your security posture — headers, the TLS certificate, cookie flags, mixed content and DNS records such as SPF and DMARC. It never probes for vulnerabilities or attempts any kind of exploit.
Where does the agent readiness score come from?
From Is Agentic, an open assessment by Vercel Labs. We run it alongside our own checks and show it next to our score rather than blending the two, so you can always tell which number came from where.
Can Lusivision fix what the Analyzer finds?
Yes — that is our day job. We build websites, digital products and custom software, and most of the findings Analyzer reports are things we resolve as a matter of course. Send us the results and we will tell you what is worth doing first.
Measured it? We can build it.
The services behind the checks.
Web Development
Web development for businesses: marketing sites, conversion pages, client portals and public web applications — fast, accessible and built for search from the start.
Custom Software
We build custom software around how your business actually works: web applications, business platforms, system integrations and process automation. Discovery, delivery and long-term maintenance.
AI Development
AI development services for businesses: language model integration, RAG systems, AI automation and internal assistants — built with clear boundaries, human review and measurable outcomes.
More on this from our blog
Where we go deeper on what the Analyzer measures.
Migrating to Next.js 16: A Practical Upgrade Guide
Next.js 16 makes caching opt-in, turns params into promises, and swaps middleware for proxy.ts. Here is how to upgrade an App Router app without breaking it.
Core Web Vitals in 2026: How to Finally Pass INP
INP is the most failed Core Web Vital in 2026, and 43% of sites still miss it. Here is how to fix interactivity, LCP and CLS so Google can actually rank you.
Headless CMS for Marketing Sites: Worth It in 2026?
A headless CMS promises speed and flexibility, but it is not free. Here is when a decoupled stack pays off for a marketing site, and when it is overkill.
Next.js SEO: An App Router Playbook That Ranks
Most Next.js sites leave rankings on the table with a few avoidable mistakes. Here is the App Router SEO playbook we use to ship sites that Google can actually read.
A report is a starting point, not a plan
Run your site through the Analyzer, then send us what it found. We will tell you which findings actually matter for your business, what they cost to fix, and what we would do first.