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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yubico.com

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

Export

yubico.com

Mobile

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.66.114

Server Location

🇨🇦 Montreal, Canada

ASN

AS54113

Organization

Fastly, Inc.

CDN

Fastly

Nameservers

ns-cloud-e4.googledomains.com.ns-cloud-e3.googledomains.com.ns-cloud-e2.googledomains.com.ns-cloud-e1.googledomains.com.

Performance

Page Speed

1.6 MB

135 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.9

cms

Yubicool 2.0: Nubicoolv2.0.0

by Yubico

Technology Stack

12 Technologies Detected

Plugins

Coronado Blocks

WPML

Yubico User Segments Yubicool Wp

Analytics

Libraries

CSS Frameworks

Tag Managers

Reviews

SEO Analysis

A88/100

yubico.comyubico.com

Yubico | YubiKey Strong Two Factor Authentication

Get the YubiKey, the #1 security key, offering strong two factor authentication from industry leader Yubico.

Title Length49 chars

Recommended: 50-60 chars

Description Length108 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

6 rules

Sitemap reference found

Sponsored

Security Score

61%Fair

Interactive

HTTPS

No WAF

175d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

06.07.2025

Valid Until

07.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (9)

yubico.comdemo.yubico.comdevelopers.yubico.comdocs.yubico.comdownloads.yubico.comemail.pr.yubico.comforum.yubico.comwww.yubico.com+1 more

SHA-256 Fingerprint

8E:5C:F4:A3:C1:A3:EB:85:AC:1F:6C:81:C7:07:4B:AF:52:97:CA:7F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

2627

cache-control

🟡 0s(max-age=0)

content-encoding

⚡ Brotli(br)

content-length

47693

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

alt3.aspmx.l.google.com

alt1.aspmx.l.google.com

aspmx.l.google.com

alt4.aspmx.l.google.com

+1 more

Domain Information

yubico.com

Domain Age

19y 1m

Created

21.12.2006

Expires

21.12.2028

Last Updated

26.01.2026

Registrar

MarkMonitor Inc.

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

Noto Sans + sans-serif

67/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

4x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Noto Sans

Sans60px

Body Font

sans-serif

Sans15px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

60px

36px

20px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.0x 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.

⚠️ Risky: Text appears on background images without overlay protection.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

yubico.com(5)googletagmanager.com(3)consent.cookiebot.com(2)sgtm.yubico.com(2)fast.wistia.net(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube GitHub

Sponsored

Last analyzed: 13 Feb 2026 at 02:17

Historical Analysis & Change Tracking