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.

Back to Search

xuexi.cn

https://xuexi.cn· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

xuexi.cn

Mobile

Sponsored

Hosting Provider

Chinanet SH

IP Address

180.163.44.121

Server Location

🇨🇳 Shanghai, China

ASN

AS4812

Organization

Chinanet SH

Server

Tengine

CDN

Performance

Page Speed

41.9 MB

201 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Chinanet SH

CDN

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Web Servers

Tengine

SEO Analysis

F17/100

xuexi.cnxuexi.cn

学习强国

No description available for this page.

Title Length4 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 (25/25)

9 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

47065 rules

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

351d

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/1.1

Valid From

30.12.2025

Valid Until

31.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.xuexi.cnxuexi.cn

SHA-256 Fingerprint

DD:C6:D5:ED:1D:7E:BF:BA:B6:31:7C:2D:8D:F1:C6:2D:3F:FA:B4:B3...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

ali-swift-global-savetime

1771006533

cache-control

🔴 No Cache(no-cache)

content-encoding

📦 Gzip(gzip)

content-md5

JH1tOrJ+CykvooLaUNB9OQ==

content-type

text/html

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

xuexi.cn

DNSSEC

Not Enabled

Typography & Readability

Microsoft YaHei

6/100

Readability

/30

5/40

12px · LH 1.17

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Microsoft YaHei

Body Font

Microsoft YaHei

Sans12px

Contrast Ratio

Reading Comfort

~130 CPL

Needs attention

12px

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

⚠️ Tight line spacing (1.17). Consider 1.4-1.6 for better readability.

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

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

❌ Very long lines: ~130 chars/line causes eye strain. Use max-width: 65ch.

⚠️ Cramped layout: 28 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

6 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)retcode.alicdn.com(1)long-term-cache.xuexi.cn(1)

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Last analyzed: 13 Feb 2026 at 18:16

Historical Analysis & Change Tracking