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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ufrj.br

https://ufrj.br· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

ufrj.br

Mobile

Sponsored

Hosting Provider

Fundação Carlos Chagas Filho de Amparo a Pesquisa

IP Address

200.156.137.16

Server Location

🇧🇷 Rio de Janeiro, Brazil

ASN

AS2715

Organization

Fundação Carlos Chagas Filho de Amparo a Pesquisa

Server

Nginx

Nameservers

ns.ufrj.br.nsx.ufrj.br.

Performance

Page Speed

352 KB

39 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Twenty Twentyv2.9

by the WordPress team

View Theme

Technology Stack

12 Technologies Detected

Plugins

Gutenberg

Ufrj Breadcrumbs Ufrj Posts Recentes Molongui Authorship

Analytics

Meta Frameworks

Libraries

CSS Frameworks

Icon Libraries

Web Servers

Languages

SEO Analysis

D50/100

ufrj.brufrj.br

Universidade Federal do Rio de Janeiro – Universidade Federal do Ri...

No description available for this page.

Title truncated.

Title Length79 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

7 URLs

robots.txt

4 rules

Sitemap reference found

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

46d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

31.12.2025

Valid Until

31.03.2026

Subject Alternative Names (2)

ufrj.brwww.ufrj.br

SHA-256 Fingerprint

66:AF:D5:41:31:CD:11:C2:54:9C:A2:BB:98:03:5F:B3:36:AC:EE:41...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-length

15463

content-type

text/html; charset=UTF-8

date

Fri, 13 Feb 2026 15:52:40 GMT

link

<https://ufrj.br/wp-json/>; rel="https://api.w.org/", <https...

server

nginx/1.29.3

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

smtp.ufrj.br

Domain Information

ufrj.br

Domain Age

30y 1m

Created

01.01.1996

Last Updated

06.06.2023

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Playfair Display + sans-serif

60/100

Readability

/30

30/40

19px · LH --

Hierarchy

/20

25/25

2.21x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Playfair Display

Serif42px

Body Font

sans-serif

Sans19px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

42px

19px

✅ Excellent readability: 19px body text is ideal for all devices.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

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

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

⚠️ Risky: Text appears on background images without overlay protection.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

ufrj.br(9)googletagmanager.com(1)vlibras.gov.br(1)cdn.jsdelivr.net(1)

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Last analyzed: 13 Feb 2026 at 15:53

Historical Analysis & Change Tracking