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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ecmwf.int

https://ecmwf.int· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

ecmwf.int

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

54.73.72.151

Server Location

🇮🇪 Dublin, Ireland

ASN

AS16509

Organization

AWS EC2 (eu-west-1)

Server

Nginx

Nameservers

ns5.rdg.ecmwf.int.ns1.ecmwf.int.ns2.ecmwf.int.ns4.ecmwf.int.+1 more

Performance

Page Speed

5.8 MB

82 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Tailwind CSS

CMS

Drupalv9

Infrastructure

Hosting

Amazon Web Services (AWS)

Technology Stack

11 Technologies Detected

Analytics

Libraries

CSS Frameworks

Other

AOS (Animate On Scroll)

Icon Libraries

Material Icons

Tag Managers

Google Tag Manager

Web Servers

Nginx

SEO Analysis

D58/100

ecmwf.intecmwf.int

ECMWF | Advancing global NWP through international collaboration

ECMWF is the European Centre for Medium-Range Weather Forecasts. We are both a research institute and a 24/7 operational service, producing global numerical ...

Description truncated.

Title Length64 chars

Recommended: 50-60 chars

Description Length362 chars

Recommended: 120-160 chars

Issues (0)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

2 URLs

robots.txt

53 rules

Sponsored

Security Score

41%Poor

Interactive

HTTPS

No WAF

266d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

11.11.2025

Valid Until

11.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (7)

www.ecmwf.intwww.www.ecmwf.intecmwf.intstage.ecmwf.intwww.stage.ecmwf.intcmsdev.ecmwf.intwww.cmsdev.ecmwf.int

SHA-256 Fingerprint

6C:BA:94:2E:4F:E5:8F:03:98:0D:5E:81:91:CB:13:A4:58:0F:01:EF...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 900s(max-age=900, public)

content-encoding

📦 Gzip(gzip)

content-language

content-type

text/html; charset=UTF-8

date

Wed, 18 Feb 2026 07:18:14 GMT

etag

W/"1771399093"

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

ecmwf-int.mail.protection.outlook.com

Domain Information

ecmwf.int

Domain Age

28y 4m

Created

10.10.1997

Last Updated

09.04.2025

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Open Sans

83/100

Readability

/30

40/40

16px · LH 1.56

Hierarchy

/20

18/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Open Sans

Sans32px

Body Font

Open Sans

Sans16px

Contrast Ratio

Reading Comfort

~45 CPL

Optimal (45–75)

32px

30px

16px

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

✅ Optimal line spacing: 1.56 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x 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.

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

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

MouseflowSMB

User behavior and product analytics

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)static.addtoany.com(3)googletagmanager.com(2)cdn.mouseflow.com(1)unpkg.com(1)

Website Identity

Facebook Instagram LinkedIn Bluesky

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Last analyzed: 18 Feb 2026 at 08:09

Historical Analysis & Change Tracking