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.

Technology Comparison

React vs Svelte

Side-by-side comparison based on real-world adoption data from 560 detections across analyzed websites.

Market Share Distribution

React (69%)Svelte (31%)

Total Detections

387

React

HIGHER

173

Svelte

Websites Using

387

React

HIGHER

173

Svelte

Used Together

websites use both

1% OVERLAP

React

Frameworks

Meta's JavaScript library for building user interfaces with a component-based architecture. The most popular frontend library with a massive ecosystem.

387 detections

387 sites

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Svelte

Frameworks

Compiler-based UI framework that shifts work to build time, producing highly optimized vanilla JavaScript with zero runtime overhead.

173 detections

173 sites

Visit Website View Profile

Our Analysis

React has a slight edge over Svelte, detected on 387 vs 173 websites. 5 websites use both technologies together (1% overlap). Both are in the Frameworks category, making them direct alternatives.

Frequently Asked Questions

What is the difference between React and Svelte?

Meta's JavaScript library for building user interfaces with a component-based architecture. The most popular frontend library with a massive ecosystem. Compiler-based UI framework that shifts work to build time, producing highly optimized vanilla JavaScript with zero runtime overhead. Both belong to the Frameworks category, making them direct alternatives.

Which is more popular, React or Svelte?

Based on our analysis of real websites, React is more widely adopted with 387 detections compared to Svelte's 173.

Can React and Svelte be used together?

Yes! We've detected 5 websites that use both React and Svelte together, showing they can complement each other in certain setups.

Check Any Website's Technology Stack

Find out if a website uses React, Svelte, or any other technology.

Analyze a Website

More Comparisons

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React vs Svelte

Market Share Distribution

React

Svelte

Our Analysis

Sites Using Both (5)

Only React

Only Svelte

Frequently Asked Questions

What is the difference between React and Svelte?

Which is more popular, React or Svelte?

Can React and Svelte be used together?

Check Any Website's Technology Stack

More Comparisons