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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fang.com

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

Export

fang.com

Sponsored

Hosting Provider

21ViaNet

IP Address

124.251.87.37

Server Location

🇨🇳 Chaowai, China

ASN

AS56048

Organization

21ViaNet

Server

Nginx

Nameservers

ns3.soufun.com.ns.soufun.com.ns1.soufun.com.

Performance

Page Speed

3.2 MB

196 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

21ViaNet

Technology Stack

3 Technologies Detected

Libraries

jQuery

Analytics

Google Analytics

Web Servers

Nginx

SEO Analysis

D41/100

fang.comfang.com

石家庄房地产门户|石家庄房地产网】- 石家庄房天下

石家庄房天下是国内领先的房地产家居网络平台，提供及时的房地产新闻资讯内容，为楼盘提供网上浏览、业主论坛和社区网站，房地产精英人物个人主页，是国内房地产媒体及业内外网友公认的房地产网络平台，引擎给网友提供房地产网站中速度快捷内容全面的智能搜索。

Title Length25 chars

Recommended: 50-60 chars

Description Length121 chars

Recommended: 120-160 chars

Issues (3)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (208/216)
• Missing viewport meta tag - page may not be mobile-friendly

7 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

31 rules

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

193d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

20.08.2025

Valid Until

29.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (11)

*.fang.com*.esf.fang.com*.newhose.fang.com*.office.fang.com*.shop.fang.com*.zu.fang.com*.news.fang.com*.bbs.fang.com+3 more

SHA-256 Fingerprint

5C:54:9C:A7:0E:5E:F2:15:E1:D7:DA:61:D5:D2:AA:2A:DB:A2:96:20...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Mon, 16 Feb 2026 23:05:53 GMT

etag

W/"69939f20-29fd4"

last-modified

Mon, 16 Feb 2026 22:50:08 GMT

server

nginx

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mailmx1.fang.com

mailmx.fang.com

Domain Information

fang.com

Domain Age

30y 10m

Created

16.04.1995

Expires

20.06.2029

Last Updated

17.09.2025

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

-apple-system

60/100

Readability

/30

24/40

14px · LH 1.93

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

-apple-system

Sans

Body Font

-apple-system

Sans14px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

24px

16px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

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

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 95 elements lack adequate spacing.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

adapi.fang.com(12)static.soufunimg.com(5)zz.bdstatic.com(1)js.soufunimg.com(1)

Website Identity

X (Twitter)

Sponsored

Last analyzed: 16 Feb 2026 at 23:06

Historical Analysis & Change Tracking