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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europepmc.org

https://europepmc.org· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

europepmc.org

Mobile

Sponsored

Hosting Provider

European Bioinformatics Institute

IP Address

193.62.193.83

Server Location

🇬🇧 Cambridge, United Kingdom

ASN

AS786

Organization

European Bioinformatics Institute

Server

Apache

Nameservers

ns-1707.awsdns-21.co.uk.ns-348.awsdns-43.com.ns-813.awsdns-37.net.ns-1133.awsdns-13.org.

Performance

Page Speed

1.6 MB

134 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

European Bioinformatics Institute

Technology Stack

8 Technologies Detected

Libraries

Analytics

Other

CSS Frameworks

Icon Libraries

Web Servers

SEO Analysis

D52/100

europepmc.orgeuropepmc.org

Home - Europe PMC

Europe PMC is an archive of life sciences journal literature.

Title Length17 chars

Recommended: 50-60 chars

Description Length61 chars

Recommended: 120-160 chars

Issues (0)

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

120 rules

Sitemap reference found

Sponsored

Security Score

44%Poor

Interactive

HTTPS

No WAF

143d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GoDaddy.com, Inc.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

04.06.2025

Valid Until

06.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (6)

europepmc.orgwww.europepmc.orgtest.europepmc.orgplus.europepmc.orgbeta.europepmc.orgepmc.org

SHA-256 Fingerprint

B6:2E:04:E4:11:55:8D:9A:0A:07:68:67:A4:DE:E3:73:73:EB:5C:D2...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-credentials

true

access-control-allow-headers

Origin, X-Requested-With, Content-Type, Accept, Authorizatio...

access-control-allow-methods

POST, GET

access-control-allow-origin

access-control-max-age

3600

cache-control

🔴 No Cache(no-cache, max-age=0, must-revalidate, no-store)

Good Warning Issue

Email Infrastructure

GoDaddy Email

Score

SPF

DKIM

DMARC

MX Records (2)

smtp.secureserver.net

mailstore1.secureserver.net

Domain Information

europepmc.org

Domain Age

16y 11m

Created

17.03.2009

Expires

17.03.2027

Last Updated

11.07.2024

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Data Protection Officer mentioned

Typography & Readability

Myriad Pro

55/100

Readability

/30

32/40

15px · LH 1.50

Hierarchy

/20

20/25

1.73x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Myriad Pro

Sans26px

Body Font

Myriad Pro

Sans15px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

26px

21px

15px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

✅ Good performance: Using 1 font families keeps load times fast.

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

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

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Crazy EggSMB

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(14)script.crazyegg.com(2).(2)localhost(1)europepmc.org(1)

Website Identity

X (Twitter)YouTube

Sponsored

Last analyzed: 12 Feb 2026 at 17:26

Historical Analysis & Change Tracking