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

sxsw.com

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

Export

sxsw.com

Mobile

Sponsored

Hosting Provider

Automattic, Inc

IP Address

192.0.66.33

Server Location

🇺🇸 San Francisco, United States

ASN

AS2635

Server

Nginx

CDN

Nameservers

ns-205.awsdns-25.com.ns-1002.awsdns-61.net.ns-1453.awsdns-53.org.ns-1565.awsdns-03.co.uk.

Performance

Page Speed

7.4 MB

82 requests

Image Optimization

WebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Tailwind CSS

CMS

WordPress

Infrastructure

Hosting

Automattic, Inc

CDN

Technology Stack

16 Technologies Detected

Plugins

Ts Poll Wonderplugin Tabs Content Protector

Jquery Collapse O Matic

Libraries

Analytics

Other

CSS Frameworks

Icon Libraries

Tag Managers

Marketing

Web Servers

SEO Analysis

B76/100

sxsw.comsxsw.com

SXSW Conferences & Festivals | March 12-18, 2026

Helping creatives achieve their goals.

Title Length48 chars

Recommended: 50-60 chars

Description Length38 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

64d

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

Valid From

18.01.2026

Valid Until

18.04.2026

Subject Alternative Names (2)

sxsw.comwww.sxsw.com

SHA-256 Fingerprint

65:EC:FA:71:9E:CE:CA:6F:77:05:E3:22:7C:27:2F:E6:E1:15:34:65...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟡 300s(max-age=300, must-revalidate)

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Fri, 13 Feb 2026 09:46:38 GMT

host-header

a9130478a60e5f9135f765b23f26593b

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

smtp.google.com

Domain Information

sxsw.com

Domain Age

30y 6m

Created

01.08.1995

Expires

31.07.2026

Last Updated

31.07.2023

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Osano

Cookie Consent Banner

Osano

GDPR Indicators

Cookie consent banner detected

CMP: Osano

Data Protection Officer mentioned

Typography & Readability

Founders Grotesk Condensed + Helvetica

58/100

Readability

/30

32/40

16px · LH 1.25

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

Founders Grotesk Condensed

Sans

Body Font

Helvetica

Sans16px

Contrast Ratio

Reading Comfort

~46 CPL

Optimal (45–75)

40px

48px

16px

Minor Third

Scale

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

✅ Protected text on images: Using gradient for readability.

✅ Optimal line length: ~46 characters per line is comfortable to read.

⚠️ Cramped layout: 23 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

CRM Systems

HubSpotMid-Market

Customer Relationship Management platforms

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OsanoMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

sxsw.com(14)googletagmanager.com(3)gstatic.com(1)cmp.osano.com(1)google.com(1)

Website Identity

sxsw.com

30 years old

GoDaddy.com, LLC📧 Google Workspace

Social Profiles

Facebook Instagram LinkedIn YouTube TikTok Bluesky

Sponsored

Last analyzed: 13 Feb 2026 at 09:46

Historical Analysis & Change Tracking