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

yahooinc.com

https://yahooinc.com· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

yahooinc.com

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

76.223.84.192

Server Location

🇺🇸 Seattle, United States

ASN

AS16509

Organization

AWS Global Accelerator (GLOBAL)

Server

Apache Traffic Server

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns3.yahoo.com.ns5.yahoo.com.ns1.yahoo.com.ns4.yahoo.com.+1 more

Performance

Page Speed

6 KB

71 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

Cloudflare

Technology Stack

9 Technologies Detected

Analytics

Frameworks

Libraries

CSS Frameworks

Fonts

Tag Managers

Advertising

SEO Analysis

B78/100

yahooinc.comyahooinc.com

Yahoo Inc.

Yahoo, the trusted guide for millions globally with iconic products for 30+ years—offers advertisers omnichannel solutions and powerful data to deliver results.

Title Length10 chars

Recommended: 50-60 chars

Description Length160 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (14/26)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

842 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

66%Fair

Interactive

HTTPS

WAF

152d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

27.01.2026

Valid Until

22.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

yho.comucs.netsvs.yahoo.comtw.buy.yahoo.commaw.ouroath.comid.berita.yahoo.comforums.yahoo.netenlight.yahoo.netbrb.yahoo.net+12 more

SHA-256 Fingerprint

67:EF:55:55:D1:2D:F1:80:85:C7:86:6B:CD:60:15:6B:77:63:D0:0F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-headers

DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Cont...

access-control-allow-methods

GET, OPTIONS

access-control-allow-origin

access-control-expose-headers

Content-Length,Content-Range

age

alt-svc

h3=":443"; ma=86400

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mxb-00505701.gslb.pphosted.com

mxa-00505701.gslb.pphosted.com

Domain Information

yahooinc.com

Domain Age

25y 3m

Created

06.11.2000

Expires

06.11.2026

Last Updated

05.10.2025

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Typography & Readability

CentraNo2

80/100

Readability

/30

32/40

18px · LH 1.33

Hierarchy

/20

25/25

4.44x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

CentraNo2

Sans80px

Body Font

CentraNo2

Sans18px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

80px

14px

40px

18px

Perfect Fifth

Scale

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Strong hierarchy: Headlines are 4.4x larger than body text.

✅ 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: 16 elements lack adequate spacing.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

6 Tools Detected

Enterprise

Marketing Automation

MarketoEnterprise

Email marketing and automation platforms

Behavior Analytics

HotjarMid-Market

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

LinkedIn AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

16 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.prod.website-files.com(6)googletagmanager.com(2)snap.licdn.com(1)ajax.googleapis.com(1)static.hotjar.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn

Sponsored

Last analyzed: 20 Feb 2026 at 08:00

Historical Analysis & Change Tracking