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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pytorch.org

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

Export

pytorch.org

Mobile

Sponsored

Hosting Provider

Pantheon

pantheon.io

IP Address

23.185.0.2

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

981 KB

108 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.9

cms

Salient Child Themev1.0

by ThemeNectar

View Theme

Technology Stack

20 Technologies Detected

Plugins

Events Calendar Pro Lf Pt Matrix Search Filter Pro The Events Calendar Salient Core Js_Composer_Salient

Analytics

Libraries

UI Components

Other

CSS Frameworks

Icon Libraries

Tag Managers

Marketing

Advertising

Web Servers

SEO Analysis

B74/100

pytorch.orgpytorch.org

PyTorch

PyTorch Foundation is the deep learning community home for the open source PyTorch framework and ecosystem.

Title Length7 chars

Recommended: 50-60 chars

Description Length107 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

13 URLs

robots.txt

4 rules

Sitemap reference found

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

46d

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

01.01.2026

Valid Until

01.04.2026

Subject Alternative Names (1)

pytorch.org

SHA-256 Fingerprint

9B:03:FD:DC:F9:17:8C:C3:DF:79:26:87:D8:43:04:32:BC:BB:E8:18...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

3090

cache-control

🟡 60s(public, max-age=60, s-maxage=43200, stale-while-revalidate=8...)

content-encoding

📦 Gzip(gzip)

content-length

52040

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt3.aspmx.l.google.com

aspmx.l.google.com

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

+1 more

Domain Information

pytorch.org

Domain Age

9y 6m

Created

15.08.2016

Expires

15.08.2026

Last Updated

25.11.2025

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

Legitimate interest basis mentioned

Typography & Readability

Montserrat + Helvetica

73/100

Readability

/30

32/40

16px · LH 1.25

Hierarchy

/20

18/25

3.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Montserrat

Sans56px

Body Font

Helvetica

Sans16px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

56px

36px

28px

24px

16px

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

✅ Strong hierarchy: Headlines are 3.5x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

⚠️ Cramped layout: 41 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

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Business & Marketing Stack

7 Tools Detected

Enterprise

CRM Systems

HubSpotMid-Market

Customer Relationship Management platforms

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

LinkedIn AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

OsanoMid-Market

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

pytorch.org(5)googletagmanager.com(4)connect.facebook.net(2)snap.licdn.com(1)js.hs-banner.com(1)

Website Identity

Facebook X (Twitter)LinkedIn GitHub Discord

Sponsored

Last analyzed: 13 Feb 2026 at 20:58

Historical Analysis & Change Tracking