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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jwz.org

https://jwz.org· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

jwz.org

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.16.178.106

Server Location

🇺🇸 Dublin, United States

ASN

AS16509

Organization

AWS EC2 (us-east-2)

Server

Mosaic Netsite Commerce Server/1.0.0 (Irix)

Nameservers

NS6.PAIRNIC.COM.NS5.PAIRNIC.COM.

Performance

Page Speed

3 KB

4 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

Technology Stack

1 Technologies Detected

Comments

Disqus

SEO Analysis

F38/100

jwz.orgjwz.org

jwz.org

Jamie Zawinski was one of the founders of Netscape and Mozilla.org, was the primary developer of Lucid Emacs, and wrote most of you...

Description truncated.

Title Length7 chars

Recommended: 50-60 chars

Description Length304 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

7 issues found

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Crawlability

Sitemap

Type: index

2 URLs

robots.txt

339 rules

Sponsored

A+

Security Score

98%Excellent

Static / Informational

HTTPS

No WAF

85d

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/2

Valid From

15.02.2026

Valid Until

16.05.2026

Subject Alternative Names (7)

jwz.comjwz.netjwz.orgwww.jwz.comwww.jwz.netwww.jwz.orgwww2.jwz.org

SHA-256 Fingerprint

C6:70:F2:D1:66:31:0B:8F:FB:F5:18:C1:B8:96:8D:21:02:ED:EF:EE...

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔵 1 Week(max-age=604800)

content-encoding

📦 Gzip(gzip)

content-length

20995

content-security-policy

default-src * data: blob: 'unsafe-inline'

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mail.jwz.org

Domain Information

jwz.org

Domain Age

27y 6m

Created

03.08.1998

Expires

02.08.2026

Last Updated

14.01.2026

Registrar

pair Networks, Inc. d/b/a pair Domains

DNSSEC

Not Enabled

Typography & Readability

Bitstream Vera Sans Mono + Menlo

45/100

Readability

/30

12/40

13px · LH 1.20

Hierarchy

/20

8/25

WCAG

/25

12/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Bitstream Vera Sans Mono

Body Font

Menlo

Mono13px

Contrast Ratio

Reading Comfort

Mixed Pairing

left aligned

❌ Critical: 13px body text is too small. Increase to at least 14px.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Clean layout: Consistent left alignment throughout.

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Scripts & Styles

2 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(1)

Website Identity

Facebook X (Twitter)Instagram YouTube Mastodon

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Last analyzed: 20 Feb 2026 at 08:51

Historical Analysis & Change Tracking