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

linux.org

https://linux.org· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

linux.org

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.67.73.26

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

mark.ns.cloudflare.com.lia.ns.cloudflare.com.

Performance

Page Speed

864 KB

55 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

13 Technologies Detected

Advertising

Google Ads Google AdSense Criteo Outbrain

CSS Frameworks

Tailwind CSS

Normalize.css

Icon Libraries

Font Awesome Material Icons

Analytics

Fonts

Payments

CDN

SEO Analysis

C67/100

linux.orglinux.org

Linux.org

Friendly Linux Forum

Title Length9 chars

Recommended: 50-60 chars

Description Length20 chars

Recommended: 120-160 chars

Issues (0)

5 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

1 rules

Allows all crawlers

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

WAF

34d

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+H3

Valid From

19.12.2025

Valid Until

20.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

linux.org*.linux.org

SHA-256 Fingerprint

14:A7:AC:04:32:01:82:60:BE:11:9E:6F:67:76:A9:EE:F4:ED:01:8D...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

server

cloudflare

date

Fri, 13 Feb 2026 02:22:32 GMT

content-type

text/html; charset=utf-8

speculation-rules

"/cdn-cgi/speculation"

priority

u=0, i

x-frame-options

SAMEORIGIN

Good Warning Issue

Email Infrastructure

ImprovMX

Score

SPF

DKIM

DMARC

MX Records (2)

mx2.improvmx.com

mx1.improvmx.com

Domain Information

linux.org

Domain Age

31y 9m

Created

10.05.1994

Expires

11.05.2034

Last Updated

16.05.2024

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Legitimate interest basis mentioned

Typography & Readability

Segoe UI + Open Sans

63/100

Readability

/30

22/40

14px · LH --

Hierarchy

/20

13/25

1.71x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Segoe UI

Sans24px

Body Font

Open Sans

Sans14px

Contrast Ratio

Reading Comfort

~63 CPL

Optimal (45–75)

24px

20px

17px

14px

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

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

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

✅ Protected text on images: Using gradient for readability.

✅ Optimal line length: ~63 characters per line is comfortable to read.

GGoogle Fonts

Business & Marketing Stack

3 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Social Media

Pinterest WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)pagead2.googlesyndication.com(4)googletagmanager.com(2)fundingchoicesmessages.google.com(2)google-analytics.com(1)

Website Identity

linux.org

31 years old

Network Solutions, LLC📧 ImprovMX

Social Profiles

X (Twitter)Bluesky

Sponsored

Last analyzed: 13 Feb 2026 at 02:23

Historical Analysis & Change Tracking