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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vnexpress.net

https://vnexpress.net· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

vnexpress.net

Mobile

Sponsored

Hosting Provider

Fptonline

IP Address

111.65.250.2

Server Location

🇻🇳 Ho Chi Minh City, Vietnam

ASN

AS45894

Organization

Fptonline

Server

vne-qt-fe-lv1-other-0

CDN

Proxy Cache

Nameservers

ns1.fptonline.vn.ns2.fptonline.vn.

Performance

Page Speed

470 KB

182 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Fptonline

CDN

Proxy Cache

Progressive Web App

Service WorkerApple Touch Icon

Technology Stack

14 Technologies Detected

Advertising

Google Ads Criteo Taboola Outbrain

Analytics

Libraries

UI Components

CSS Frameworks

Icon Libraries

Fonts

Tag Managers

CDN

SEO Analysis

A88/100

vnexpress.netvnexpress.net

Báo VnExpress - Báo tiếng Việt nhiều người xem nhất

VnExpress tin tức mới nhất - Thông tin nhanh & chính xác được cập nhật hàng giờ. Đọc báo tin tức online Việt Nam & Thế giới nóng nhất trong ngày về thể thao,...

Description truncated.

Title Length51 chars

Recommended: 50-60 chars

Description Length192 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

69 URLs

robots.txt

6 rules

Sitemap reference found

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

No WAF

203d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

04.08.2025

Valid Until

05.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (6)

*.vnexpress.netowa.vnexpress.netmail.vnexpress.netautodiscover.vnexpress.netwww.vnexpress.netvnexpress.net

SHA-256 Fingerprint

EB:1D:0C:1F:32:22:71:61:1B:9C:03:58:0A:97:37:BE:B9:82:72:4C...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cache-control

🟡 60s(max-age=60, stale-while-revalidate=6, stale-if-error=864000,...)

content-encoding

📦 Gzip(gzip)

content-security-policy

upgrade-insecure-requests; default-src data: 'unsafe-inline'...

content-type

text/html; charset=utf-8

date

Fri, 13 Feb 2026 13:19:27 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

vnexpress-net.mail.protection.outlook.com

mailgw02.fpt.com.vn

mailgw01.fpt.com.vn

Domain Information

vnexpress.net

Domain Age

25y 6m

Created

15.08.2000

Expires

15.08.2034

Last Updated

15.08.2024

Registrar

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Legitimate interest basis mentioned

Typography & Readability

arial

40/100

Readability

/30

22/40

15px · LH --

Hierarchy

/20

8/25

1x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

arial

Sans15px

Body Font

arial

Sans15px

Contrast Ratio

Reading Comfort

~44 CPL

Needs attention

15px

18px

20px

16px

15px

Minor Second

Scale

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

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

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

✅ 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.

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

GGoogle Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

28 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(5)scdn.eclick.vn(4)s1cdn.vnecdn.net(3)la2.vnecdn.net(2)google-analytics.com(2)

Website Identity

Facebook X (Twitter)YouTube TikTok

Sponsored

Last analyzed: 13 Feb 2026 at 13:20

Historical Analysis & Change Tracking