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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mercadolibre.com.ar

https://mercadolibre.com.ar· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

mercadolibre.com.ar

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.33.182.45

Server Location

🇨🇦 Montreal, Canada

ASN

AS16509

Organization

AWS Global Accelerator (GLOBAL)

Server

Tengine

Nameservers

ns-476.awsdns-59.com.ns-771.awsdns-32.net.ns-1193.awsdns-21.org.ns-1887.awsdns-43.co.uk.

Performance

Page Speed

1.1 MB

132 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

Technology Stack

8 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Hotjar

Advertising

Google Ads Google AdSense

CSS Frameworks

Tailwind CSS

Web Servers

Tengine

Customer Support

Zendesk

SEO Analysis

B78/100

mercadolibre.com.armercadolibre.com.ar

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Title Length49 chars

Recommended: 50-60 chars

Description Length130 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

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Crawlability

Sitemap

robots.txt

89 rules

Sponsored

Security Score

45%Poor

Critical / Transactional

HTTPS

No WAF

259d

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

06.10.2025

Valid Until

04.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.mercadolibre.com.armercadolibre.com.ar

SHA-256 Fingerprint

80:21:C7:19:56:25:E1:B2:7C:D5:16:4C:F8:8D:BB:CC:80:F4:BC:3A...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ch

device-memory, dpr, viewport-width, rtt, downlink, ect, save...

accept-ch-lifetime

cache-control

🔴 No Cache(private, max-age=0, no-cache, no-store, must-revalidate)

content-encoding

⚡ Brotli(br)

content-security-policy

script-src 'nonce-OWO6XCWp1Bnh4eNKQi0Dww==' 'strict-dynamic'...

content-security-policy-report-only

script-src 'nonce-OWO6XCWp1Bnh4eNKQi0Dww==' 'strict-dynamic'...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

aspmx3.googlemail.com

alt2.aspmx.l.google.com

alt1.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

mercadolibre.com.ar

Domain Age

26y 9m

Created

11.05.1999

Expires

11.05.2026

Last Updated

03.12.2018

Registrar

nicar

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

-apple-system

58/100

Readability

/30

10/40

13px · LH --

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

-apple-system

Sans26px

Body Font

-apple-system

Sans13px

Contrast Ratio

Reading Comfort

~47 CPL

Optimal (45–75)

26px

20px

18px

13px

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

✅ Strong hierarchy: Headlines are 2.0x 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.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

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

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

HotjarMid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

http2.mlstatic.com(19)mercadolibre.com.ar(1)

Website Identity

Facebook X (Twitter)Instagram YouTube

Sponsored

Last analyzed: 18 Feb 2026 at 06:56

Historical Analysis & Change Tracking