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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vlex.com

https://vlex.com· First analyzed 25 Apr 2026· Updated 25 Apr 2026

Export

vlex.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

13.33.235.31

Site Location

🇺🇸 Global, United Statesvia schema_nap

Server Location

🇺🇸 New York, United States

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

CDN

CloudFront

Nameservers

ns-113.awsdns-14.com.ns-1451.awsdns-53.org.ns-1751.awsdns-26.co.uk.ns-858.awsdns-43.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

416 ms10%

Speed Index

541 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

978 KB

123 requests

Image Optimization

WebPAVIF

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Strapi

Technology Stack

7 Technologies Detected

Analytics

UI Components

Other

CSS Frameworks

Fonts

Tag Managers

SEO Analysis

A82/100

Meta Tags15/15

Content12/12

Headings8/8

Technical20/25

E-E-A-T2/7

Images5/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile4/4

Indexability3/3

vlex.comvlex.com

vLex (Part of Clio) | AI Legal Research Tools for Lawyers

vLex (part of Clio) is the leading AI legal research platform. Trusted by 2.8M+ lawyers for AI-powered legal research, smart drafting & litigation intelligence.

Title Length57 chars

Recommended: 50-60 chars (~343px / 580px)

Description Length160 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

128 rules

Allows all crawlers

Local SEO

Local Search Readiness

33/100

Needs Work

9 12

Sponsored

AI & LLM Readiness

D52/100

Bot Access

17/25

Machine Read.

12/25

Schema Data

8/25

Citation

15/25

AI Bot Access

11/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

blockquotesnav

Text ratio:11%

Words:988

Token eff.:Optimal

Sections/1K:11.1

Depth:2/5

Structured Data

2 JSON-LD

Person×1.3Organization×1.1WebSite

sameAs entity links

Citation Readiness

Opening Summary34w

Descriptive Headingsavg 8w

Canonical URL

Open Graph3/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (6)

AI readiness recommendation preview...

Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

87/100

Passed

Critical

Warnings

Images & Alt Text

18/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

17/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

15/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

13/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

9/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

72/100

99 mg

CO₂e / view

978.0 KB

Page Weight

70%

Cleaner Than

New Visitor

113 mg

Returning (cached)

56 mg

Annual (10K/mo)

11.9 kg

Emission Segments

Data Center

5 mg

Network

29 mg

Device

65 mg

Resource Breakdown

JavaScript

192.2 KB

Images

7.9 KB

CSS

764.6 KB

Fonts

1.9 KB

HTML

11.3 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

1 recommendation

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

76%Good

Static / Informational

HTTPS

No WAF

223d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

06.11.2025

Valid Until

04.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (10)

vlex.com*.vlex.com.covlex.com.covlex.com.mx*.vlex.com.mx*.vlex.com.br*.vlex.clvlex.com.br+2 more

SHA-256 Fingerprint

CB:CA:04:57:14:47:9D:3E:D9:51:CB:32:9E:FB:CB:43:B9:A6:6C:E6...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

33464

content-encoding

⚡ Brotli(br)

content-language

content-type

text/html; charset=utf-8

date

Sat, 25 Apr 2026 00:22:03 GMT

etag

W/"f5bd-dFqDh++XBikn3Zes28siVIEcvTE"

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (7)

aspmx4.googlemail.com

aspmx5.googlemail.com

aspmx.l.google.com

alt1.aspmx.l.google.com

+3 more

Domain Information

vlex.com

Domain Age

26y 4m

Created

09.12.1999

Expires

09.12.2032

Last Updated

09.12.2022

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

59/100

Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1.0

2 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

At Aero Retina + Aeonik

WCAG Partial

71/100

Readability

/30

21/30

18px · LH 1.50

Hierarchy

/20

16/20

3.56x ratio · ✓ H1→H6

WCAG

/25

14/25

1.71:1 min contrast

Performance

/25

20/25

2 fonts · 3 req

Heading Font

At Aero Retina

Sans64px

Body Font

Aeonik

Sans18px

Contrast Ratio

1.71:1

10 issues

Reading Comfort

~34 CPL

Narrow lines

64px

56px

48px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 28/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 10 elements below WCAG AA threshold (min 1.7:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 3.6x larger than body text.

GGoogle Fonts Buy on MyFontsFlesch 28

Color Palette

6 unique colors

Light

#ffffff

Background· 19.700000000000003%

#7ec3fc

Accent· 62.1%

#29354f

Primary· 11.399999999999999%

#547497

Secondary· 4.2%

#1d273e

Secondary· 1.4%

#e0eef4

Secondary· 1.1%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Social Media

LinkedIn WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)unpkg.com(1)googletagmanager.com(1)

Website Identity

vLex

Organization

vLex is a global legal intelligence pioneer transforming how lawyers work through precision-engineered AI solutions. Our flagship platform Vincent combines vLex's unparalleled global legal database with cutting-edge AI to create an assistant that takes the heavy lifting out of legal work. Built on 2

vlex.com

26 years old

Global

Global, International

Location detected: 🇺🇸 United States, Globalvia schema_nap

Network Solutions, LLC📧 Google WorkspaceenEst. 2000

Social Profiles

Facebook X (Twitter)LinkedIn

Sponsored

Last analyzed: 25 Apr 2026 at 09:40

Historical Analysis & Change Tracking