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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ersjournals.com

https://ersjournals.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

ersjournals.com

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.17.141.178

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

yolanda.ns.cloudflare.com.carl.ns.cloudflare.com.

Performance

Page Speed

2.2 MB

66 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

CMS

Drupal

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

7 Technologies Detected

UI Components

CSS Frameworks

Icon Libraries

Analytics

Tag Managers

CDN

Languages

SEO Analysis

D52/100

ersjournals.comersjournals.com

Home | European Respiratory Society

No description available for this page.

Title Length35 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

6 issues found

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Security Score

46%Poor

Interactive

HTTPS

WAF

81d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

09.02.2026

Valid Until

10.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

publications.ersnet.org*.publications.ersnet.org

SHA-256 Fingerprint

AF:6F:65:56:C5:19:36:F6:2B:D3:70:56:CC:58:F5:6F:39:52:E3:32...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

date

Wed, 18 Feb 2026 06:40:35 GMT

content-type

text/html; charset=UTF-8

content-encoding

📦 Gzip(gzip)

x-powered-by

PHP/8.1.31

cache-control

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

x-drupal-dynamic-cache

HIT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

ersjournals.com

Domain Age

21y 10m

Created

02.04.2004

Expires

14.07.2026

Last Updated

15.06.2025

Registrar

Tucows Domains Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Helvetica

88/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

2.69x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Helvetica

Sans43px

Body Font

Helvetica

Sans16px

Contrast Ratio

Reading Comfort

~60 CPL

Optimal (45–75)

43px

26px

20px

18px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.7x larger than 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.

✅ Optimal line length: ~60 characters per line is comfortable to read.

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

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(11)cdn.foxycart.com(2)static.addtoany.com(2)app-script.monsido.com(1)monsido-consent.com(1)

Website Identity

ersjournals.com

21 years old

Tucows Domains Inc.

Social Profiles

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 18 Feb 2026 at 06:41

Historical Analysis & Change Tracking