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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kdnuggets.com

https://kdnuggets.com· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

kdnuggets.com

Sponsored

Hosting Provider

Pressable

pressable.com

IP Address

199.16.173.149

Server Location

🇺🇸 San Francisco, United States

ASN

AS2635

Organization

Pressable

Server

Nginx

CDN

Cloudflare

WAF

Cloudflare

Nameservers

kirk.ns.cloudflare.com.lila.ns.cloudflare.com.

Performance

Page Speed

836 KB

87 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Pressable

CDN

Cloudflare

Detected API Sources

https://cdn.id5-sync.com/api/1...

Technology Stack

25 Technologies Detected

Plugins

Wordpress Popular Posts

TablePress

Add To Any

Google Analytics Premium

Page Links To Q2W3 Fixed Widget Perfmatters Boxzilla Boxzilla Stats Mailchimp For Wp Mc4Wp Premium

Advertising

Google Ads Google AdSense Microsoft Advertising

Libraries

Analytics

CSS Frameworks

Tag Managers

Social

Web Servers

CDN

Marketing

Customer Support

SEO Analysis

B70/100

kdnuggets.comkdnuggets.com

Data Science, Machine Learning, AI & Analytics - KDnuggets

Data Science, Machine Learning, AI & Analytics

Title Length58 chars

Recommended: 50-60 chars

Description Length46 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (13/23)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

10 rules

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

46d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

07.01.2026

Valid Until

07.04.2026

Subject Alternative Names (20)

aspireyogastudio.combouddhisme-online.comcanjie.linkcaravanfinancerates.finance.blogcodeofconduct.popcorngirlscouts.comdevotionsfordisciple.comdietandweightloss.family.blogentelligent.blog+12 more

SHA-256 Fingerprint

6E:01:34:30:5D:7F:9C:22:EC:71:DD:8E:F1:1E:55:F6:71:D7:A6:E7...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Thu, 19 Feb 2026 10:48:35 GMT

host-header

wpcloud

link

<https://www.kdnuggets.com/wp-json/>; rel="https://api.w.org...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

aspmx.l.google.com

alt3.aspmx.l.google.com

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

+1 more

Domain Information

kdnuggets.com

Domain Age

29 years

Created

13.02.1997

Expires

14.02.2028

Last Updated

15.02.2026

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

consentmanager

Cookie Consent Banner

consentmanager

GDPR Indicators

Cookie consent banner detected

CMP: consentmanager

Data Protection Officer mentioned

Typography & Readability

Open Sans

36/100

Readability

/30

10/40

13px · LH --

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Open Sans

Sans

Body Font

Open Sans

Sans13px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

26px

13px

❌ Critical: 13px body text is too small. Increase to at least 14px.

✅ 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.

⚠️ Cramped layout: 11 elements lack adequate spacing.

⚠️ Inconsistent alignment: Mix of left/center/right creates visual noise.

Buy on MyFonts

Business & Marketing Stack

6 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Social Media

AddThisFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

ads.adthrive.com(4)bat.bing.com(3)kdnuggets.com(3)cdn.confiant-integrations.net(2)googletagmanager.com(2)

Website Identity

Facebook X (Twitter)

Sponsored

Last analyzed: 19 Feb 2026 at 10:48

Historical Analysis & Change Tracking