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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scikit-learn.org

https://scikit-learn.org· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

scikit-learn.org

Mobile

Sponsored

Hosting Provider

GitHub Pages

pages.github.com

IP Address

185.199.108.153

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

ns-83-a.gandi.net.ns-38-b.gandi.net.ns-83-c.gandi.net.

Performance

Page Speed

1.6 MB

57 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

GitHub Pages

CDN

Fastly

Technology Stack

4 Technologies Detected

CSS Frameworks

Icon Libraries

Fonts

SEO Analysis

D47/100

scikit-learn.orgscikit-learn.org

scikit-learn: machine learning in Python — scikit-learn 1.8.0 docum...

No description available for this page.

Title truncated.

Title Length75 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

6 issues found

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Sponsored

Security Score

0%Critical

Interactive

No SSL

No WAF

nulld

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

cache-control

🟡 600s(max-age=600)

content-encoding

📦 Gzip(gzip)

content-length

824

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

spool.mail.gandi.net

fb.mail.gandi.net

Domain Information

scikit-learn.org

Domain Age

14y 4m

Created

19.10.2011

Expires

19.10.2029

Last Updated

30.05.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Typography & Readability

SFMono-Regular + -apple-system

97/100

Readability

/30

40/40

16px · LH 1.65

Hierarchy

/20

25/25

3.2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

SFMono-Regular

Mono51px

Body Font

-apple-system

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

51px

24px

16px

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

✅ Optimal line spacing: 1.65 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.2x larger than body text.

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

✅ Protected text on images: Using gradient for readability.

✅ Clean layout: Consistent left alignment throughout.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

PlausibleSMB

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

25 Resources

Scripts

Styles

Async

Defer

Top Script Sources

_static(14)views.scientific-python.org(1)

Website Identity

Facebook Instagram LinkedIn YouTube GitHub TikTok Discord Mastodon Bluesky

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Last analyzed: 14 Feb 2026 at 13:30

Historical Analysis & Change Tracking