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

itsfoss.com

https://itsfoss.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

itsfoss.com

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.66.175.239

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

alex.ns.cloudflare.com.kara.ns.cloudflare.com.

Performance

Page Speed

507 KB

117 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Ghostv6.19

Technology Stack

6 Technologies Detected

Analytics

CSS Frameworks

Fonts

Payments

CDN

SEO Analysis

A84/100

itsfoss.comitsfoss.com

It's FOSS

Making You a Better Linux User

Title Length9 chars

Recommended: 50-60 chars

Description Length30 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

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Crawlability

Sitemap

Type: standard

robots.txt

6 rules

Sitemap reference found

Sponsored

Security Score

55%Poor

Critical / Transactional

HTTPS

WAF

68d

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

26.01.2026

Valid Until

26.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

itsfoss.com

SHA-256 Fingerprint

B3:76:E5:60:0B:3E:81:3F:E0:91:E6:8C:5E:66:66:5D:6F:AF:95:FC...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

12530

alt-svc

h3=":443"; ma=86400

cache-control

🟡 0s(public, max-age=0)

cf-cache-status

HIT

cf-ray🇩🇪 Frankfurt

9cf48d29b87edbff-FRA

content-encoding

⚡ Brotli(br)

Good Warning Issue

Email Infrastructure

Proton Mail

Score

SPF

DKIM

DMARC

MX Records (2)

mail.protonmail.ch

mailsec.protonmail.ch

Domain Information

itsfoss.com

Domain Age

13y 8m

Created

09.06.2012

Expires

09.06.2028

Last Updated

16.05.2023

Registrar

Cloudflare, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Figtree

88/100

Readability

/30

40/40

16px · LH 1.60

Hierarchy

/20

25/25

3.83x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Figtree

Sans61px

Body Font

Figtree

Sans16px

Contrast Ratio

Reading Comfort

~33 CPL

Needs attention

61px

22px

16px

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

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.8x 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

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.fastcomments.com(8)local(4)googletagmanager.com(2)cdn.jsdelivr.net(2)google-analytics.com(1)

Website Identity

itsfoss.com

13 years old

Cloudflare, Inc.📧 Proton Mail

Social Profiles

Facebook X (Twitter)Instagram GitHub Telegram Mastodon Reddit Bluesky

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Last analyzed: 17 Feb 2026 at 10:20

Historical Analysis & Change Tracking