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

lesscss.org

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

Export

lesscss.org

Sponsored

Hosting Provider

GitHub Pages

pages.github.com

IP Address

185.199.110.153

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

ns3.iwantmyname.net.ns4.iwantmyname.net.ns1.iwantmyname.net.ns2.iwantmyname.net.

Performance

Page Speed

128 KB

17 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

GitHub Pages

CDN

Fastly

Technology Stack

6 Technologies Detected

CSS Frameworks

Analytics

Libraries

Fonts

SEO Analysis

D47/100

lesscss.orglesscss.org

Getting started | Less.js

Less extends CSS with dynamic behavior such as variables, mixins, operations and functions. Less runs on both the server-side (with Node.js and Rhino) or cli...

Description truncated.

Title Length25 chars

Recommended: 50-60 chars

Description Length190 chars

Recommended: 120-160 chars

Issues (0)

8 issues found

Upgrade to view details

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

88d

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

19.02.2026

Valid Until

20.05.2026

Subject Alternative Names (2)

lesscss.orgwww.lesscss.org

SHA-256 Fingerprint

E9:1E:40:3C:B7:DB:C7:84:F6:1F:87:EF:E4:E7:77:D1:B0:3C:72:B6...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

490

cache-control

🟡 600s(max-age=600)

content-encoding

📦 Gzip(gzip)

content-length

7455

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

lesscss.org

Domain Age

16y 9m

Created

14.05.2009

Expires

14.05.2026

Last Updated

24.11.2025

Registrar

1API GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Helvetica Neue

82/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

21/25

2.19x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Helvetica Neue

Sans35px

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

35px

28px

25px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x 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.

⚠️ Cramped layout: 11 elements lack adequate spacing.

GGoogle Fonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.carbonads.com(1)fastly.jsdelivr.net(1)code.jquery.com(1)netdna.bootstrapcdn.com(1)cdnjs.cloudflare.com(1)

Website Identity

GitHub

Sponsored

Last analyzed: 20 Feb 2026 at 11:37

Historical Analysis & Change Tracking