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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pfsense.org

https://pfsense.org· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

pfsense.org

Mobile

Sponsored

Hosting Provider

zColo

IP Address

208.123.73.78

Server Location

🇺🇸 Austin, United States

ASN

AS30312

Server

Nginx

Nameservers

ns1.netgate.com.ns2.netgate.com.

Performance

Page Speed

842 KB

35 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

zColo

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

11 Technologies Detected

CSS Frameworks

Analytics

Libraries

Other

Icon Libraries

Fonts

Tag Managers

Advertising

Web Servers

SEO Analysis

B70/100

pfsense.orgpfsense.org

pfSense® - World's Most Trusted Open Source Firewall

pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more

Title Length52 chars

Recommended: 50-60 chars

Description Length135 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

19 URLs

robots.txt

2 rules

Allows all crawlers

Sponsored

A+

Security Score

91%Excellent

Static / Informational

HTTPS

No WAF

47d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

02.01.2026

Valid Until

02.04.2026

Subject Alternative Names (9)

pfsense.co.zapfsense.compfsense.netpfsense.nlpfsense.orgwww.pfsense.co.zawww.pfsense.comwww.pfsense.net+1 more

SHA-256 Fingerprint

B7:74:A7:8B:3C:1D:44:31:EB:F7:D6:F2:88:C1:12:17:CA:7B:92:8C...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

connection

keep-alive

content-length

26549

content-type

text/html

date

Sat, 14 Feb 2026 13:58:17 GMT

etag

"6837615b-67b5"

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

aspmx2.googlemail.com

alt2.aspmx.l.google.com

aspmx3.googlemail.com

aspmx.l.google.com

+1 more

Domain Information

pfsense.org

Domain Age

21y 3m

Created

05.11.2004

Expires

05.11.2026

Last Updated

12.09.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Varela Round + sans-serif

84/100

Readability

/30

40/40

16px · LH 1.63

Hierarchy

/20

21/25

2.25x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Varela Round

Sans36px

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

36px

24px

16px

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

✅ Optimal line spacing: 1.62 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

✅ Protected text on images: Using gradient for readability.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

LinkedIn AdsEnterprise

Reddit PixelMid-Market

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

14 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)googletagmanager.com(2)snap.licdn.com(1)redditstatic.com(1)

Website Identity

X (Twitter)YouTube GitHub Reddit

Sponsored

Last analyzed: 14 Feb 2026 at 13:58

Historical Analysis & Change Tracking