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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vietnamnet.vn

https://vietnamnet.vn· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

vietnamnet.vn

Mobile

Sponsored

Hosting Provider

CMCTELECOM

IP Address

202.134.19.38

Server Location

🇻🇳 Hanoi, Vietnam

ASN

AS45903

Organization

CMCTELECOM

Server

Nginx

Nameservers

dns2.srv.vietnamnet.vn.dns1.srv.vietnamnet.vn.dns3.srv.vietnamnet.vn.

Performance

Page Speed

438 KB

130 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

CMCTELECOM

Technology Stack

11 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Microsoft Clarity

Advertising

Google Ads Google AdSense

Libraries

CSS Frameworks

Fonts

Tag Managers

Web Servers

SEO Analysis

B70/100

vietnamnet.vnvietnamnet.vn

Tin tức 24h mới nhất, tin nhanh Việt Nam và thế giới | Báo VietNamNet

Tin tức 24h mới nhất trên VietNamNet, tin nhanh Việt Nam và thế giới. Đọc báo tin tức online các lĩnh vực chính trị, thời sự, kinh doanh, thể thao, giải trí...

Title Length69 chars

Recommended: 50-60 chars

Description Length159 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

robots.txt

9 rules

Sitemap reference found

Sponsored

Security Score

31%Critical

Interactive

HTTPS

No WAF

36d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

20.02.2025

Valid Until

24.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

vietnamnet.vn*.vietnamnet.vn

SHA-256 Fingerprint

21:70:C9:F3:9F:2B:E0:FF:7C:9F:CA:B3:3D:BA:03:FD:B9:6C:A0:31...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟣 Private(private)

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=utf-8

date

Sun, 15 Feb 2026 10:08:56 GMT

etag

W/"134156237119563242"

iscache

02/15/2026 17:08:31-1p-1-a3217874e29f4b8aad55fa1d7313f80c

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

MX Records (7)

ALT1.ASPMX.L.GOOGLE.COM

ASPMX5.GOOGLEMAIL.COM

ASPMX.L.GOOGLE.COM

ALT2.ASPMX.L.GOOGLE.COM

+3 more

Domain Information

vietnamnet.vn

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Times New Roman

33/100

Readability

/30

25/40

16px · LH 1.00

Hierarchy

/20

8/25

1x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

Times New Roman

Serif16px

Body Font

Times New Roman

Serif16px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

16px

20px

15px

16px

Minor Second

Scale

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

⚠️ Tight line spacing (1.00). Consider 1.4-1.6 for better readability.

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

✅ Consistent design: Single font family with weight variations is a modern best practice.

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

⚠️ Cramped layout: 15 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Microsoft ClarityFree

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(5)vads.net.vn(3)clarity.ms(2)connect.facebook.net(2)pagead2.googlesyndication.com(1)

Website Identity

Facebook X (Twitter)YouTube TikTok

Sponsored

Last analyzed: 15 Feb 2026 at 10:10

Historical Analysis & Change Tracking