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.com

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

Export

linux.com

Mobile

Sponsored

Hosting Provider

Pantheon

pantheon.io

IP Address

23.185.0.3

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

Pantheon

Server

Nginx

CDN

Fastly

Nameservers

ns4.dnsimple-edge.org.ns1.dnsimple.com.ns2.dnsimple-edge.net.ns3.dnsimple.com.

Performance

Page Speed

777 KB

76 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.9

cms

Newspaperv12.7.4

by tagDiv

View Theme

Technology Stack

19 Technologies Detected

Plugins

Profile Builder Td Composer Td Standard Pack

Duracelltomi Google Tag Manager

Analytics

Advertising

Google Ads Google AdSense LinkedIn Ads

Customer Support

Libraries

CSS Frameworks

Fonts

Tag Managers

Marketing

Web Servers

SEO Analysis

A88/100

linux.comlinux.com

Linux.com - News For Open Source Professionals

Linux.com is the go-to resource for open source professionals to learn about the latest in Linux and open source technology, careers, best practices, and ind...

Description truncated.

Title Length46 chars

Recommended: 50-60 chars

Description Length286 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

115 URLs

robots.txt

4 rules

Sitemap reference found

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

45d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

31.12.2025

Valid Until

31.03.2026

Subject Alternative Names (2)

linux.comwww.linux.com

SHA-256 Fingerprint

96:D4:83:DC:3E:C6:A4:05:23:24:83:97:7B:49:8A:98:1F:8A:2A:F5...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

789

cache-control

🟡 1800s(public, max-age=1800)

content-encoding

📦 Gzip(gzip)

content-length

35835

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Forward Email

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mx2.forwardemail.net

mx1.forwardemail.net

Domain Information

linux.com

Domain Age

31y 8m

Created

02.06.1994

Expires

01.06.2026

Last Updated

23.11.2025

Registrar

1API GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

Verdana

60/100

Readability

/30

32/40

15px · LH 1.74

Hierarchy

/20

8/25

0.93x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Verdana

Sans14px

Body Font

Verdana

Sans15px

Contrast Ratio

Reading Comfort

~480 CPL

Needs attention

14px

25px

16px

15px

Minor Third

Scale

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.74 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

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

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

❌ Very long lines: ~480 chars/line causes eye strain. Use max-width: 65ch.

GGoogle Fonts

Business & Marketing Stack

8 Tools Detected

Enterprise

CRM Systems

HubSpotMid-Market

Customer Relationship Management platforms

Customer Support

DriftMid-Market

Live chat and helpdesk tools

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Facebook PixelMid-Market

LinkedIn AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

28 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(4)linux.com(3)connect.facebook.net(2)snap.licdn.com(2)pagead2.googlesyndication.com(1)

Website Identity

X (Twitter)

Sponsored

Last analyzed: 13 Feb 2026 at 21:41

Historical Analysis & Change Tracking