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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tuoitre.vn

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

Export

tuoitre.vn

Sponsored

Hosting Provider

VNPT

IP Address

14.225.199.147

Server Location

🇻🇳 Hanoi, Vietnam

ASN

AS135905

Organization

VNPT

Server

OpenResty

CDN

Cloudflare

WAF

Cloudflare

Nameservers

deborah.ns.cloudflare.com.michael.ns.cloudflare.com.

Performance

Page Speed

3.8 MB

250 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

VNPT

CDN

Cloudflare

Progressive Web App

Service Worker

Technology Stack

8 Technologies Detected

Analytics

Libraries

CSS Frameworks

Tag Managers

Advertising

Web Servers

SEO Analysis

B70/100

tuoitre.vntuoitre.vn

Báo Tuổi Trẻ - Tin tức mới nhất, tin nhanh, tin nóng 24h

Tin tức mới nhất trên các lĩnh vực chính trị, xã hội, văn hóa, thể thao ở Việt Nam và quốc tế. Tin tức thời sự mỗi ngày sẽ được Tuổi Trẻ Online liên tục cập ...

Description truncated.

Title Length56 chars

Recommended: 50-60 chars

Description Length164 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Missing viewport meta tag - page may not be mobile-friendly

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

12 rules

Sitemap reference found

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

45d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

SSL Corporation

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

12.03.2025

Valid Until

04.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.tuoitre.vntuoitre.vn

SHA-256 Fingerprint

81:9C:FF:6C:8B:98:D0:27:CC:F6:A6:92:CD:A1:CD:45:F8:50:B1:48...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟣 Private(private)

content-encoding

📦 Gzip(gzip)

content-length

102727

content-type

text/html; charset=utf-8

crc32

f514f273

date

Tue, 17 Feb 2026 16:13:20 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mail.tuoitre.com.vn

Domain Information

tuoitre.vn

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Helvetica + Roboto

63/100

Readability

/30

25/40

20px · LH 1.00

Hierarchy

/20

8/25

1.4x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Helvetica

Sans28px

Body Font

Roboto

Sans20px

Contrast Ratio

Reading Comfort

~64 CPL

Optimal (45–75)

28px

21px

16px

20px

✅ Excellent readability: 20px 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.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

✅ Protected text on images: Using gradient for readability.

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

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

media1.admicro.vn(8)googletagmanager.com(4)static.contineljs.com(2)cdnt.netcoresmartech.com(2)google-analytics.com(2)

Website Identity

Facebook YouTube

Sponsored

Last analyzed: 17 Feb 2026 at 16:13

Historical Analysis & Change Tracking