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.

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ellenmacarthurfoundation.org

https://ellenmacarthurfoundation.org· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

75.2.60.5

Server Location

🇺🇸 Seattle, United States

ASN

AS16509

Organization

AWS Global Accelerator (GLOBAL)

Server

Netlify

Nameservers

ns-cloud-c1.googledomains.com.ns-cloud-c4.googledomains.com.ns-cloud-c3.googledomains.com.ns-cloud-c2.googledomains.com.

Performance

Page Speed

691 KB

64 requests

Image Optimization

Lazy LoadWebPAVIFResponsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚡ SSG

Decoupled

Frontend

Framework

Gatsby

API

Data Source

Headless CMS

Contentful

Infrastructure

Hosting

Amazon Web Services (AWS)

Progressive Web App

Web ManifestApple Touch IconTheme Color

Detected API Sources

https://images.ctfassets.net/i...

Technology Stack

10 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Fonts

Tag Managers

Email Marketing

Payments

Platforms

SEO Analysis

C64/100

ellenmacarthurfoundation.orgellenmacarthurfoundation.org

Leading the Transition to a Circular Economy | Ellen MacArthur Foun...

Accelerating the global transition to a circular economy - working with businesses, policymakers and institutions to create systems that benefit people and t...

Title truncated. Description truncated.

Title Length73 chars

Recommended: 50-60 chars

Description Length172 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (84/151)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

1 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

25%Critical

Critical / Transactional

HTTPS

No WAF

33d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

19.12.2025

Valid Until

19.03.2026

Subject Alternative Names (2)

ellenmacarthurfoundation.orgwww.ellenmacarthurfoundation.org

SHA-256 Fingerprint

45:5E:14:99:28:D6:E2:22:B7:28:3C:58:9A:A5:DB:62:7E:0E:D3:89...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

cache-control

🟡 0s(public,max-age=0,must-revalidate)

cache-status

"Netlify Edge"; fwd=miss

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Mimecast

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

eu-smtp-inbound-2.mimecast.com

eu-smtp-inbound-1.mimecast.com

Domain Information

ellenmacarthurfoundation.org

Domain Age

17y 2m

Created

28.11.2008

Expires

28.11.2028

Last Updated

31.03.2025

Registrar

IONOS SE

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Legitimate interest basis mentioned

Typography & Readability

Inter + sans-serif

87/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

4.67x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Inter

Sans70px

Body Font

sans-serif

Sans15px

Contrast Ratio

Reading Comfort

~44 CPL

Needs attention

70px

28px

18px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.7x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

✅ Consistent design: Single font family with weight variations is a modern best practice.

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

GGoogle Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)consent.cookiebot.com(2)youtube.com(2)googletagmanager.com(2)

Website Identity

ellenmacarthurfoundation.org

17 years old

IONOS SE📧 Mimecast

Social Profiles

Facebook Instagram LinkedIn YouTube Medium

Sponsored

Last analyzed: 14 Feb 2026 at 03:40

Historical Analysis & Change Tracking