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

vnu.edu.vn

https://vnu.edu.vn· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

vnu.edu.vn

Sponsored

Hosting Provider

VietNam National University

IP Address

112.137.143.67

Server Location

🇻🇳 Hanoi, Vietnam

ASN

AS45542

Organization

VietNam National University

Nameservers

dns.vnu.edu.vn.

Performance

Page Speed

8.5 MB

150 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

JAMstack

🔀 Hybrid

Decoupled

Frontend

Framework

Next.js

Styling

Tailwind CSS

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

VietNam National University

Detected API Sources

https://idt.vnu.edu.vn/api/med...

Technology Stack

7 Technologies Detected

Analytics

Meta Frameworks

Other

CSS Frameworks

Icon Libraries

SEO Analysis

C64/100

vnu.edu.vnvnu.edu.vn

Đại học Quốc gia Hà Nội

Trang web chính thức của Đại học Quốc gia Hà Nội

Title Length23 chars

Recommended: 50-60 chars

Description Length48 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

302 URLs

robots.txt

13 rules

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

181d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

16.07.2025

Valid Until

17.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

vnu.edu.vn*.vnu.edu.vn

SHA-256 Fingerprint

07:B2:56:42:A9:34:B5:8D:39:94:16:B4:93:EC:B9:3D:A4:78:13:4D...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

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

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Mon, 16 Feb 2026 13:29:50 GMT

link

</_next/static/media/127080024ce00d90-s.p.woff2>; rel=preloa...

vary

RSC, Next-Router-State-Tree, Next-Router-Prefetch, Next-Rout...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

ALT1.ASPMX.L.GOOGLE.COM

ALT2.ASPMX.L.GOOGLE.COM

ALT4.ASPMX.L.GOOGLE.COM

ALT3.ASPMX.L.GOOGLE.COM

+1 more

Domain Information

vnu.edu.vn

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

SF Pro Display

49/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

8/25

1x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

SF Pro Display

Sans16px

Body Font

SF Pro Display

Sans16px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

16px

Minor Second

Scale

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ 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.

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

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(11)googletagmanager.com(1)

Website Identity

Facebook TikTok

Sponsored

Last analyzed: 16 Feb 2026 at 13:30

Historical Analysis & Change Tracking