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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vietnamplus.vn

https://vietnamplus.vn· First analyzed 17 Feb 2026· Updated 17 Feb 2026

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vietnamplus.vn

Sponsored

Hosting Provider

VNA-VNNIC

IP Address

202.6.97.142

Server Location

🇻🇳 Hanoi, Vietnam

ASN

AS23999

Organization

VNA-VNNIC

Server

Nginx

Nameservers

ns3.vnanet.vn.ns2.vnanet.vn.ns1.vnanet.vn.

Performance

Page Speed

55 KB

65 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

VNA-VNNIC

Technology Stack

11 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel

Advertising

Google Ads Google AdSense

Libraries

UI Components

CSS Frameworks

Fonts

Tag Managers

Web Servers

SEO Analysis

A88/100

vietnamplus.vnvietnamplus.vn

Vietnam+ (VietnamPlus)

Tin tức Việt Nam và thế giới nhanh nhất, tin cậy, chính thống từ TTXVN, cập nhật liên tục 24/7. The most reliable source of news in Vietnam on political, bus...

Description truncated.

Title Length22 chars

Recommended: 50-60 chars

Description Length223 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

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Crawlability

Sitemap

Type: index

196 URLs

robots.txt

89 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

161d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

14.08.2025

Valid Until

28.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.vietnamplus.vnvietnamplus.vn

SHA-256 Fingerprint

6F:11:69:27:AF:6B:6A:71:DB:1E:D2:E1:58:BD:97:09:7F:F2:DB:88...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html;charset=utf-8

date

Tue, 17 Feb 2026 08:54:13 GMT

etag

0aa9fa5badcbdc3c885d91403d13ead2

server

nginx

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mailgw.vietnamplus.vn

Domain Information

vietnamplus.vn

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Arial

83/100

Readability

/30

40/40

16px · LH 1.40

Hierarchy

/20

20/25

1.75x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Arial

Sans28px

Body Font

Arial

Sans16px

Contrast Ratio

Reading Comfort

~45 CPL

Optimal (45–75)

28px

21px

16px

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

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and 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.

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

media1.admicro.vn(5)media.vietnamplus.vn(2)adminplayer.sohatv.vn(2)za.zdn.vn(1)googletagmanager.com(1)

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Last analyzed: 17 Feb 2026 at 08:54

Historical Analysis & Change Tracking