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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4399.com

https://4399.com· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

4399.com

Sponsored

Hosting Provider

Tencent Cloud

cloud.tencent.com

IP Address

129.211.129.109

Server Location

🇨🇳 Shanghai, China

ASN

AS45090

Organization

Tencent Cloud Computing (Beijing) Co., Ltd

Server

Nginx

Nameservers

ns1.dnsv5.com.ns2.dnsv5.com.

Performance

Page Speed

164 KB

136 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Tencent Cloud

Technology Stack

3 Technologies Detected

Libraries

jQueryv1.6.1

CSS Frameworks

Tailwind CSS

Web Servers

Nginx

SEO Analysis

D52/100

4399.com4399.com

小游戏,4399小游戏,小游戏大全,双人小游戏大全 - www.4399.com

4399小游戏大全包含连连看 ,连连看小游戏大全,双人小游戏大全,H5在线小游戏,4399洛克王国,4399赛尔号,4399奥拉星,4399奥比岛,4399弹弹堂,4399单人小游戏,奥比岛小游戏,造梦西游online,造梦无双等最新小游戏。

Title Length40 chars

Recommended: 50-60 chars

Description Length121 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

5 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

28 rules

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

273d

Certificate Details

Type

Organization Validated (OV)

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

03.11.2025

Valid Until

16.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

default.chinanetcenter.com*.wscdns.com*.vxzz.xyz*.hnrrco.com*.qdllm.online*.100ycdn.com*.dianping.com*.dpfile.com+12 more

SHA-256 Fingerprint

69:2A:C8:21:F1:0A:CF:AB:56:54:D6:FA:16:7D:31:B7:07:01:95:1F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

7894

cache-control

🟡 1800s(max-age=1800)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Mon, 16 Feb 2026 19:45:56 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mxbiz2.qq.com

mxbiz1.qq.com

Domain Information

4399.com

Domain Age

22y 8m

Created

29.05.2003

Expires

29.05.2031

Last Updated

04.12.2025

Registrar

eName Technology Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

宋体

31/100

Readability

/30

20/40

12px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

宋体

Body Font

宋体

Sans12px

Contrast Ratio

Reading Comfort

Single Family

left aligned

12px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

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

⚠️ Cramped layout: 37 elements lack adequate spacing.

✅ 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

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(10)c.cnzz.com(1)hm.baidu.com(1)ptlogin.3304399.net(1)w.cnzz.com(1)

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Last analyzed: 16 Feb 2026 at 19:46

Historical Analysis & Change Tracking