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

yoast.com

https://yoast.com· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

yoast.com

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.64.155.6

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

noah.ns.cloudflare.com.michelle.ns.cloudflare.com.

Performance

Page Speed

456 KB

75 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

14 Technologies Detected

Libraries

CSS Frameworks

Analytics

Plugins

Icon Libraries

Fonts

Tag Managers

Email Marketing

Reviews

CDN

SEO Analysis

A82/100

yoast.comyoast.com

SEO for everyone • Yoast

Yoast helps you with your website's search engine optimization, with our internationally loved software and our online SEO courses.

Title Length24 chars

Recommended: 50-60 chars

Description Length131 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (45/52)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

20 URLs

robots.txt

21 rules

Sitemap reference found

Sponsored

Security Score

51%Poor

Interactive

HTTPS

WAF

40d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

25.12.2025

Valid Until

25.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

yoast.com

SHA-256 Fingerprint

38:24:18:0B:B1:6B:BE:6F:CC:E2:38:CA:DF:81:31:B7:32:6C:50:31...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

date

Thu, 12 Feb 2026 14:02:08 GMT

content-type

text/html; charset=UTF-8

server

cloudflare

vary

Accept-Encoding, Cookie

cache-control

🟡 10 Hours(public, max-age=37385, s-maxage=37385, stale-while-revalidat...)

link

<https://yoast.com/app/themes/yoast-theme/css/style.min.css?...

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

yoast-com.mail.protection.outlook.com

Domain Information

yoast.com

Domain Age

25y 11m

Created

22.03.2000

Expires

22.03.2026

Last Updated

20.02.2025

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

-apple-system

86/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

2.25x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

-apple-system

Sans36px

Body Font

-apple-system

Sans16px

Contrast Ratio

Reading Comfort

~57 CPL

Optimal (45–75)

36px

44px

18px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x 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.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

6 Tools Detected

Enterprise

Marketing Automation

ActiveCampaignMid-Market

Email marketing and automation platforms

Customer Support

Help ScoutSMB

Live chat and helpdesk tools

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Reviews & Social Proof

TrustpilotMid-Market

Customer reviews and testimonials

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

yoast.com(8)beacon-v2.helpscout.net(6)googletagmanager.com(3)cdn.cookielaw.org(2)cdn-4.convertexperiments.com(1)

Website Identity

Facebook Instagram LinkedIn

Sponsored

Last analyzed: 12 Feb 2026 at 14:02

Historical Analysis & Change Tracking