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

portal.issn.org

https://portal.issn.org· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

portal.issn.org

Sponsored

Hosting Provider

OVHcloud

ovhcloud.com

IP Address

54.37.111.24

Server Location

🇫🇷 Strasbourg, France

ASN

AS16276

Organization

Godefroy Pierre

Server

Nginx

Performance

Page Speed

10.2 MB

124 requests

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

OVHcloud

Detected API Sources

https://player.vimeo.com/api/p...

Technology Stack

11 Technologies Detected

Libraries

Analytics

Other

Other

CSS Frameworks

Icon Libraries

Tag Managers

Web Servers

CDN

SEO Analysis

D47/100

portal.issn.orgportal.issn.org

Welcome to The ISSN Portal | The ISSN Portal

No description available for this page.

Title Length44 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Many images missing alt text (65/73)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

49 URLs

robots.txt

96 rules

Sponsored

Security Score

35%Critical

Critical / Transactional

HTTPS

No WAF

360d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Gandi SAS

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

08.02.2026

Valid Until

12.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.issn.orgissn.org

SHA-256 Fingerprint

62:A6:D0:8A:4D:36:5A:7A:3E:B9:24:DE:2B:4B:B6:0B:9D:11:5A:F4...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-language

en-gb

content-length

12372

content-security-policy-report-only

default-src 'self'; script-src 'self' 'unsafe-inline' 'unsaf...

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

portal.issn.org

Domain Age

29y 11m

Created

26.03.1996

Expires

27.03.2026

Last Updated

12.02.2026

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Helvetica Neue

82/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

25/25

2.29x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Helvetica Neue

Sans32px

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

Reading Comfort

~47 CPL

Optimal (45–75)

32px

26px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.3x 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.

✅ Protected text on images: Using gradient for readability.

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

Matomo (Piwik)Mid-Market

User behavior and product analytics

Sponsored

Scripts & Styles

27 Resources

Scripts

Styles

Async

Defer

Top Script Sources

portal.issn.org(17)googletagmanager.com(2)code.jquery.com(1)

Website Identity

Facebook X (Twitter)

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Last analyzed: 17 Feb 2026 at 18:56

Historical Analysis & Change Tracking