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.

Back to Search

rsc.org

https://rsc.org· First analyzed 11 Feb 2026· Updated 11 Feb 2026

Export

rsc.org

Mobile

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Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

52.31.103.110

Server Location

🇮🇪 Dublin, Ireland

ASN

AS16509

Organization

AWS EC2 (eu-west-1)

CDN

Cloudflare

WAF

Cloudflare

Nameservers

a6-66.akam.net.a7-67.akam.net.a1-90.akam.net.a22-67.akam.net.+2 more

Performance

Page Speed

551 KB

33 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Kentico

Technology Stack

5 Technologies Detected

Libraries

CSS Frameworks

Fonts

Analytics

Tag Managers

SEO Analysis

A85/100

rsc.orgrsc.org

The Royal Society of Chemistry

We help chemistry to change the world. Supporting the chemical science community through publishing research, membership, events, networks, education.

Title Length30 chars

Recommended: 50-60 chars

Description Length150 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

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Security Score

86%Very Good

Interactive

HTTPS

WAF

142d

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

cf-cache-status

DYNAMIC

cf-ray🇬🇧 London

9cc1e9ddb955c9aa-LHR

content-encoding

📦 Gzip(gzip)

content-security-policy

default-src 'self'; connect-src 'self' *.onetrust.com *.goog...

content-type

text/html; charset=utf-8

Good Warning Issue

Typography & Readability

Bitter + sans-serif

68/100

Readability

/30

40/40

18px · LH 1.60

Hierarchy

/20

25/25

3.06x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Bitter

Serif55px

Body Font

sans-serif

Sans18px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

55px

28px

22px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.1x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

⚠️ Risky: Text appears on background images without overlay protection.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)cdn-ukwest.onetrust.com(1)googletagmanager.com(1)ajax.googleapis.com(1)form.jotform.com(1)

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Last analyzed: 11 Feb 2026 at 06:51

Historical Analysis & Change Tracking