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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zol.com.cn

https://zol.com.cn· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

zol.com.cn

Mobile

Sponsored

Hosting Provider

CloudVsp.Inc

IP Address

123.59.191.4

Server Location

🇨🇳 Beijing, China

ASN

AS23724

Server

OpenResty

CDN

Nameservers

ns1.zol.com.ns.zol.com.

Performance

Page Speed

160 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

CloudVsp.Inc

CDN

Technology Stack

4 Technologies Detected

CSS Frameworks

Meta Frameworks

Web Servers

SEO Analysis

D47/100

zol.com.cnzol.com.cn

中关村在线 - 大中华区专业IT网站 - The valuable and professional IT business webs...

中国领先的IT信息与商务门户, 包括新闻, 商城, 硬件, 下载, 游戏, 手机, 评测等40个大型频道，每天发布大量各类产品促销信息及文章专题，是IT行业的厂商, 经销商, IT产品, 解决方案的提供场所

Title truncated.

Title Length87 chars

Recommended: 50-60 chars

Description Length103 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

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

6 rules

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

359d

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

06.01.2026

Valid Until

06.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.zol.com.cnzol.com.cn

SHA-256 Fingerprint

78:7A:1B:3B:47:95:49:94:6F:15:F5:40:1F:AC:4E:54:15:E7:83:49...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

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HTTP Headers

Developer Console

server

openresty

date

Thu, 12 Feb 2026 23:13:01 GMT

content-type

text/html; charset=gbk

transfer-encoding

chunked

connection

keep-alive

cache-control

🟡 120s(max-age=120)

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

staff.zol.com.cn

Domain Information

zol.com.cn

DNSSEC

Not Enabled

Typography & Readability

Microsoft YaHei

28/100

Readability

/30

20/40

12px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Microsoft YaHei

Sans

Body Font

Microsoft YaHei

Sans12px

Contrast Ratio

Reading Comfort

~147 CPL

Needs attention

20px

16px

12px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

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

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

❌ Very long lines: ~147 chars/line causes eye strain. Use max-width: 65ch.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

icon.zol-img.com.cn(6)stat.zol.com.cn(2)cdn.wwads.cn(1)cpro.zol.com.cn(1)js.zol.com.cn(1)

Sponsored

Last analyzed: 12 Feb 2026 at 23:13

Historical Analysis & Change Tracking