What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Headless UI - Websites Using Headless UI

What Is Headless UI?

Headless UI is a set of completely unstyled, fully accessible UI components created by Tailwind Labs for React and Vue. The library provides the logic and accessibility of common interface patterns without any visual styling, making it the perfect companion for Tailwind CSS projects.

Unstyled by Design

Components render minimal HTML with correct ARIA attributes, keyboard interactions, and focus management. All visual styling is applied through utility classes, making Headless UI components seamlessly integrate with any Tailwind CSS design system.

Components

The library includes Combobox (autocomplete), Dialog (modal), Disclosure (accordion), Listbox (select), Menu (dropdown), Popover, Radio Group, Switch (toggle), Tabs, and Transition. Each component handles edge cases like scroll locking, focus trapping, and click-outside dismissal.

React and Vue Support

Official support for both React and Vue ensures consistent component behavior across framework choices. The API design follows each framework's conventions while providing identical accessibility features.

Why Choose Headless UI

Tailwind CSS projects needing accessible interactive components without fighting against pre-applied styles choose Headless UI. The Tailwind Labs pedigree ensures tight integration with the Tailwind ecosystem.

Headless UI

Websites Using Headless UI

What Is Headless UI?

Unstyled by Design

Components

React and Vue Support

Why Choose Headless UI

Alternatives to Headless UI

Compare Headless UI

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