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

Vercel Image Optimization vs Next.js

Side-by-side comparison based on real-world adoption data from 2,493 detections across analyzed websites.

Market Share Distribution

Vercel Image Optimization (19%)Next.js (81%)

Total Detections

473

Vercel Image Optimization

2,020

Next.js

HIGHER

Websites Using

473

Vercel Image Optimization

2,023

Next.js

HIGHER

Used Together

470

websites use both

23% OVERLAP

Vercel Image Optimization

Frameworks

473 detections

473 sites

Visit Website View Profile

Next.js

Frameworks

React meta-framework by Vercel with server-side rendering, static generation, API routes, and App Router for production-grade web applications.

2,020 detections

2023 sites

Visit Website View Profile

Our Analysis

Next.js is significantly more popular than Vercel Image Optimization in our dataset, appearing on 2023 websites compared to 473. 470 websites use both technologies together (23% overlap). Both are in the Frameworks category, making them direct alternatives.

Only Vercel Image Optimization

christianpost.com freeapp.tools lto.de

Only Next.js

10best.com 10jqka.com.cn 123rf.com 13wham.com 17track.net 1and1.com 1password.com 1tv.ru 20min.ch 23andme.com

Frequently Asked Questions

What is the difference between Vercel Image Optimization and Next.js?

Vercel Image Optimization is a service that automatically optimizes images for the web, delivering them in modern formats like WebP and AVIF with appropriate sizing and responsive loading. It enhances website performance by reducing image file sizes and improving load times without manual intervention. React meta-framework by Vercel with server-side rendering, static generation, API routes, and App Router for production-grade web applications. Both belong to the Frameworks category, making them direct alternatives.

Which is more popular, Vercel Image Optimization or Next.js?

Based on our analysis of real websites, Next.js is more widely adopted with 2,020 detections compared to Vercel Image Optimization's 473.

Can Vercel Image Optimization and Next.js be used together?

Yes! We've detected 470 websites that use both Vercel Image Optimization and Next.js together, showing they can complement each other in certain setups.

Check Any Website's Technology Stack

Find out if a website uses Vercel Image Optimization, Next.js, or any other technology.

Analyze a Website

More Comparisons

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Vercel Image Optimization vs Next.js

Market Share Distribution

Vercel Image Optimization

Next.js

Our Analysis

Sites Using Both (470)

Only Vercel Image Optimization

Only Next.js

Frequently Asked Questions

What is the difference between Vercel Image Optimization and Next.js?

Which is more popular, Vercel Image Optimization or Next.js?

Can Vercel Image Optimization and Next.js be used together?

Check Any Website's Technology Stack

More Comparisons