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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vip.com

https://vip.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

vip.com

Mobile

Sponsored

Hosting Provider

Chinanet GD

IP Address

14.215.62.21

Server Location

🇨🇳 Guangzhou, China

ASN

AS4134

Organization

Chinanet GD

Server

Nginx

Nameservers

ns1.vip.com.ns8.vip.com.ns11.vip.com.ns7.vip.com.

Performance

Page Speed

25 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

OpenCart

Technology Stack

4 Technologies Detected

CSS Frameworks

Libraries

Web Servers

SEO Analysis

F17/100

vip.comvip.com

唯品会（vip.com）-春节不打烊

No description available for this page.

Title Length18 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (4)

• Missing meta description - important for click-through rates
• Missing H1 tag - every page should have one H1
• Many images missing alt text (4/6)

9 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

65 rules

Sponsored

Security Score

51%Poor

Interactive

HTTPS

No WAF

217d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert, Inc.

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

05.09.2025

Valid Until

23.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

*.vip.com*.union.vip.comvipshop.com*.vipshop.com*.appvipshop.comhuahaicang.cn*.huahaicang.cn*.vipapis.com+12 more

SHA-256 Fingerprint

8E:26:87:F0:21:F8:D9:79:EE:C2:8D:CE:F7:B2:A1:D6:71:AA:5F:03...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, no-store, must-revalidate)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-length

19278

content-security-policy

default-src *;frame-ancestors 'self' eiv.baidu.com *.vip.vip...

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.vip.com

Domain Information

vip.com

Domain Age

31y 5m

Created

01.09.1994

Expires

23.10.2034

Last Updated

17.09.2025

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

tahoma

21/100

Readability

/30

5/40

12px · LH 2.25

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

tahoma

Body Font

tahoma

Sans12px

Contrast Ratio

Reading Comfort

Single Family

left aligned

12px

❌ Critical: 12px body text is too small. Increase to at least 14px.

⚠️ Wide line spacing (2.25). Consider 1.4-1.8 for better flow.

✅ Good performance: Using 1 font families keeps load times fast.

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

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

h2.vipstatic.com(13)h5rsc.vipstatic.com(2)common.vip.com(2)

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Last analyzed: 18 Feb 2026 at 05:39

Historical Analysis & Change Tracking