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

lesswrong.com

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

Export

lesswrong.com

Sponsored

Hosting Provider

Vercel

vercel.com

IP Address

216.150.1.1

Server Location

🇺🇸 Walnut, United States

ASN

AS16509

Organization

Vercel, Inc

Server

Vercel

Nameservers

ns-1077.awsdns-06.org.ns-1925.awsdns-48.co.uk.ns-478.awsdns-59.com.ns-923.awsdns-51.net.

Performance

Page Speed

6 MB

95 requests

Image Optimization

Lazy LoadWebPResponsiveCloudinary

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

CMS

Substack

Infrastructure

Hosting

Vercel

CDN

Cloudinary

Technology Stack

13 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Fonts

Adobe Fonts (Typekit)Adobe Fonts

Tag Managers

Customer Support

Platforms

Security

SEO Analysis

C67/100

lesswrong.comlesswrong.com

LessWrong

A community blog devoted to refining the art of rationality

Title Length9 chars

Recommended: 50-60 chars

Description Length59 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (24/25)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

17 rules

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

65d

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

24.01.2026

Valid Until

24.04.2026

Subject Alternative Names (1)

www.lesswrong.com

SHA-256 Fingerprint

6A:E3:37:BB:03:47:A8:2E:CC:D7:61:B7:1D:57:22:ED:5B:85:21:42...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-origin

age

72261

cache-control

🟡 0s(public, max-age=0, must-revalidate)

content-disposition

inline

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mail.trikeapps.com

Domain Information

lesswrong.com

Domain Age

17y 2m

Created

10.12.2008

Expires

10.12.2026

Last Updated

05.11.2025

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

ETBookRoman + GreekFallback

65/100

Readability

/30

32/40

15px · LH 1.42

Hierarchy

/20

13/25

1.98x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

ETBookRoman

Sans30px

Body Font

GreekFallback

Sans15px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

30px

18px

20px

15px

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

✅ Optimal line spacing: 1.42 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

⚠️ Cramped layout: 11 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

AAdobe Fonts Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Customer Support

IntercomMid-Market

Live chat and helpdesk tools

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(15)google-analytics.com(2)googletagmanager.com(2)gstatic.com(1)

Sponsored

Last analyzed: 17 Feb 2026 at 20:12

Historical Analysis & Change Tracking