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.

SendGrid - Websites Using SendGrid

What Is SendGrid?

SendGrid is a cloud-based email delivery platform owned by Twilio that handles both transactional and marketing emails at scale. Processing over 100 billion emails monthly, SendGrid provides the infrastructure for reliable email delivery through SMTP relay and RESTful APIs.

Email Delivery

SendGrid's primary function is reliable email delivery. The platform manages sender reputation, handles bounce processing, manages suppression lists, and optimizes delivery through relationships with major mailbox providers. Dedicated IP addresses are available for senders who need full control over their sending reputation.

Transactional Email

Transactional emails including order confirmations, password resets, shipping notifications, and account alerts route through SendGrid's API or SMTP relay. Dynamic templates with Handlebars syntax enable personalized transactional messages without code changes.

Marketing Campaigns

The marketing platform provides a drag-and-drop email editor, contact management, list segmentation, A/B testing, and engagement statistics. Automation features support welcome series and triggered campaigns based on contact behavior.

Developer Tools

SendGrid's REST API provides comprehensive email management including sending, template management, contact list management, statistics, and webhook event notifications. Client libraries for Python, Ruby, PHP, Java, Node.js, Go, and C# simplify integration.

Why Choose SendGrid

Development teams needing reliable, scalable email delivery infrastructure choose SendGrid. The developer-friendly API, proven deliverability, and ability to handle both transactional and marketing emails from a single platform make it a practical choice for applications of any scale.

SendGrid

Websites Using SendGrid

What Is SendGrid?

Email Delivery

Transactional Email

Marketing Campaigns

Developer Tools

Why Choose SendGrid

Alternatives to SendGrid

Compare SendGrid

Analyze a Website