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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fanduel.com

https://fanduel.com· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

fanduel.com

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

13.33.235.120

Server Location

🇺🇸 New York, United States

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

OpenResty

CDN

CloudFront

Nameservers

ns-1478.awsdns-56.org.ns-1777.awsdns-30.co.uk.ns-786.awsdns-34.net.ns-81.awsdns-10.com.

Performance

Page Speed

978 KB

128 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚙️ SSR

Decoupled

Frontend

Framework

Next.js

API

Data Source

Headless CMS

Sanity

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Detected API Sources

https://cdn.sanity.io/images/p...

Technology Stack

13 Technologies Detected

Analytics

Google Analytics

Facebook Pixel Amplitude FullStory

Advertising

TikTok Pixel Snapchat Pixel

Meta Frameworks

UI Components

CSS Frameworks

Fonts

Tag Managers

Web Servers

CDN

SEO Analysis

B76/100

fanduel.comfanduel.com

Daily Fantasy Sports and Online U.S. Sportsbook & Casino | FanDuel

New FanDuel customers Bet $20, GET $150 in Bonus Bets if your Moneyline Bet Wins or a $500 bonus on fantasy with their first deposit. FanDuel offers daily fa...

Description truncated.

Title Length66 chars

Recommended: 50-60 chars

Description Length252 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (66/101)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

robots.txt

14 rules

Sitemap reference found

Sponsored

A+

Security Score

100%Excellent

Static / Informational

HTTPS

No WAF

155d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

22.06.2025

Valid Until

21.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

fanduel.com*.fanduel.com

SHA-256 Fingerprint

0E:18:31:98:56:F9:0B:CA:82:C7:C3:32:4A:EB:7C:4D:D0:E7:9A:F1...

Upgrade to view header details

HTTP Headers

Developer Console

access-control-expose-headers

x-viewer-country, x-viewer-country-region

cache-control

🔵 Public(public, s-maxage=60, stale-while-revalidate=30)

content-length

426786

content-security-policy

frame-ancestors 'self' http://localhost:3333 https://fanduel...

content-type

text/html; charset=utf-8

date

Mon, 16 Feb 2026 22:38:10 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

fanduel-com.mail.protection.outlook.com

Domain Information

fanduel.com

Domain Age

16y 10m

Created

15.04.2009

Expires

15.04.2034

Last Updated

13.01.2026

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Knockout69 + sans-serif

73/100

Readability

/30

32/40

20px · LH 1.25

Hierarchy

/20

18/25

2.3x ratio

WCAG

/25

11/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

Knockout69

Sans46px

Body Font

sans-serif

Sans20px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

46px

42px

12px

18px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Strong hierarchy: Headlines are 2.3x larger than body text.

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

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 25 elements lack adequate spacing.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

8 Tools Detected

Enterprise

Behavior Analytics

AmplitudeMid-Market

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

TikTok PixelMid-Market

Snapchat PixelMid-Market

Quora PixelMid-Market

Ad platforms and retargeting pixels

Social Media

LinkedIn WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

analytics.tiktok.com(3)googletagmanager.com(3)connect.facebook.net(3)local(3)s.tribalfusion.com(1)

Website Identity

fanduel.com

16 years old

Gandi SAS📧 Microsoft 365

Social Profiles

Facebook X (Twitter)Instagram YouTube

Sponsored

Last analyzed: 16 Feb 2026 at 22:38

Historical Analysis & Change Tracking