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

joelonsoftware.com

https://joelonsoftware.com· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

joelonsoftware.com

Mobile

Sponsored

Hosting Provider

Pressable

pressable.com

IP Address

199.16.173.181

Server Location

🇺🇸 San Francisco, United States

ASN

AS2635

Organization

Pressable

Server

Nginx

Nameservers

ns4hmp.name.com.ns1mtw.name.com.ns2nsw.name.com.ns3flt.name.com.

Performance

Page Speed

299 KB

77 requests

Image Optimization

Jetpack Photon (WordPress)

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Editor Redux

by Automattic Team 51 + Array Themes

View Theme

Technology Stack

15 Technologies Detected

Analytics

Plugins

Frameworks

Libraries

Meta Frameworks

CSS Frameworks

Icon Libraries

Fonts

Web Servers

SEO Analysis

D56/100

joelonsoftware.comjoelonsoftware.com

Joel on Software

A weblog by Joel Spolsky, a programmer working in New York City, about software and software companies.

Title Length16 chars

Recommended: 50-60 chars

Description Length103 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (6/7)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

2 rules

Allows all crawlers

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

75d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

30.01.2026

Valid Until

30.04.2026

Subject Alternative Names (20)

aucorenovations.combirdroombooks.combleuelephantllc.combrewhousebites.blogcincybookbus.comclickdeploy.shopcm-schmidt.comcommercialtruckinsuranceheadquarters.com+12 more

SHA-256 Fingerprint

BD:3E:F5:C4:4E:9D:7E:F7:FE:98:60:90:4F:B9:33:D6:5D:DE:36:3C...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

server

nginx

date

Sat, 14 Feb 2026 11:13:57 GMT

content-type

text/html; charset=UTF-8

strict-transport-security

max-age=31536000

host-header

wpcloud

vary

Accept-Encoding, accept, content-type, cookie

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mxny1.fogcreek.com

Domain Information

joelonsoftware.com

Domain Age

25y 6m

Created

29.07.2000

Expires

01.06.2027

Last Updated

30.09.2019

Registrar

Name.com, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Helvetica Neue

88/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

2.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Helvetica Neue

Sans40px

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

Reading Comfort

~47 CPL

Optimal (45–75)

40px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

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

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Optimal line length: ~47 characters per line is comfortable to read.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

c0.wp.com(10)joelonsoftware.com(4)platform.twitter.com(2)googletagmanager.com(1)secure.gaug.es(1)

Website Identity

X (Twitter)

Sponsored

Last analyzed: 14 Feb 2026 at 11:14

Historical Analysis & Change Tracking