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

r-project.org

https://r-project.org· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

r-project.org

Mobile

Sponsored

Hosting Provider

WU (Wirtschaftsuniversitaet Wien) - Vienna University of Economics and Business

IP Address

137.208.57.37

Server Location

🇦🇹 Vienna, Austria

ASN

AS1776

Organization

WU (Wirtschaftsuniversitaet Wien) - Vienna University of Economics and Business

Server

Apache

Nameservers

ns2.urbanek.info.ns2.wu-wien.ac.at.ns1.urbanek.info.ns1.wu-wien.ac.at.

Performance

Page Speed

137 KB

10 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

WU (Wirtschaftsuniversitaet Wien) - Vienna University of Economics and Business

Technology Stack

4 Technologies Detected

CSS Frameworks

Libraries

Web Servers

SEO Analysis

D58/100

r-project.orgr-project.org

R: The R Project for Statistical Computing

No description available for this page.

Title Length42 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

5 issues found

Upgrade to view details

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

338d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

16.12.2025

Valid Until

16.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.r-project.orgr-project.org

SHA-256 Fingerprint

64:8F:E2:6A:05:D8:1E:C3:D9:75:3B:17:41:5A:5A:81:46:26:CE:AD...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

content-encoding

📦 Gzip(gzip)

content-length

2386

content-type

text/html

date

Thu, 12 Feb 2026 13:54:49 GMT

etag

"185e-64271919462de-gzip"

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

rproject-org0c.mail.protection.outlook.com

Domain Information

r-project.org

Domain Age

26y 3m

Created

27.10.1999

Expires

27.10.2032

Last Updated

30.10.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Typography & Readability

Helvetica Neue

69/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

25/25

2.5x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Helvetica Neue

Sans35px

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

35px

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 2.5x 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.

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

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

mastodon-timeline.js(2)ajax.googleapis.com(1)local(1)

Website Identity

LinkedIn Bluesky

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Last analyzed: 12 Feb 2026 at 13:54

Historical Analysis & Change Tracking