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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icourse163.org

https://icourse163.org· First analyzed 23 Apr 2026· Updated 23 Apr 2026

Export

icourse163.org

Mobile

Sponsored

Hosting Provider

Chinanet GZ

IP Address

111.124.200.109

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Guiyang, China

ASN

AS139203

Organization

Chinanet GZ

Server

YDWS

Nameservers

ns1.nease.net.ns8.nease.net.ns6.nease.net.ns5.nease.net.+3 more

Performance

Core Web Vitals

Weight

First Contentful Paint

5.9 s10%

Speed Index

7.7 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

36.4 MB

246 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Chinanet GZ

Technology Stack

3 Technologies Detected

CSS Frameworks

Bootstrap

Tailwind CSS

Ant Design

SEO Analysis

D42/100

Meta Tags9/15

Content2/12

Headings1/8

Technical9/21

E-E-A-T3/7

Images2/7

Links5/5

URL5/5

Social2/5

Freshness0/4

Mobile1/4

Indexability3/3

icourse163.orgicourse163.org

中国大学MOOC_优质在线课程学习平台

中国大学MOOC(慕课) 是爱课程网携手网易云课堂打造的在线学习平台，每一个有提升愿望的人，都可以在这里学习中国优质的大学课程，学完还能获得认证证书。中国大学MOOC是国内优质的中文MOOC学习平台，拥有众多985高校的大学课程，与名师零距离。

Title Length19 chars

Recommended: 50-60 chars (~126px / 580px)

Description Length122 chars

Recommended: 120-160 chars

Issues (4)

• Very thin content (1 words). Search engines need substantial content for ranking.
• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (83/121) — critical for accessibility and SEO

14 issues found

Upgrade to view details

Local SEO

Local Search Readiness

6/100

Poor

2 13 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F33/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

0/25

Citation

6/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:1%

Words:513

Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph2/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

AI readiness recommendation preview...

Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

65/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

6/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

15/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

12/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

11/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 recommendations

•Accessibility recommendation preview...

Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

14/100

4.61 g

CO₂e / view

36.4 MB

Page Weight

Cleaner Than

New Visitor

5.26 g

Returning (cached)

2.63 g

Annual (10K/mo)

552.8 kg

Emission Segments

Data Center

1.03 g

Network

1.11 g

Device

2.47 g

Resource Breakdown

JavaScript

7.8 MB

Images

25.3 MB

CSS

3.1 MB

HTML

27.3 KB

Other

120.5 KB

Green Hosting Not Verified

Chinanet GZ

9 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

41%Poor

Interactive

HTTPS

No WAF

54d

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/2

Valid From

16.05.2025

Valid Until

16.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.icourse163.orgicourse163.org

SHA-256 Fingerprint

81:C3:7A:E0:81:29:DE:CE:B7:AD:AC:9F:5E:45:AC:93:C8:B1:D7:BA...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-language

en-GB

content-security-policy

upgrade-insecure-requests

content-type

text/html;charset=UTF-8

date

Thu, 23 Apr 2026 03:02:44 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mx.ym.163.com

Domain Information

icourse163.org

Domain Age

12y 1m

Created

25.02.2014

Expires

25.02.2027

Last Updated

19.01.2022

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

49/100

Not Mobile Friendly3 breakpoints

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

PingFangSC-Medium + Arial

WCAG Partial

64/100

Readability

/30

20/30

14px · LH 1.57

Hierarchy

/20

8/20

WCAG

/25

16/25

2.11:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

PingFangSC-Medium

Sans

Body Font

Arial

Sans14px

Contrast Ratio

2.11:1

27 issues

Reading Comfort

~57 CPL

Optimal (45–75)

14px

16px

14px

Minor Second

Scale

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.57 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~57 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 27 elements below WCAG AA threshold (min 2.1:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ System fonts: Zero font loading delay — best possible LCP impact.

Buy on MyFonts

Color Palette

7 unique colors

4.53:1 AA Light

#ffffff

Background· 54.400000000000006%

#737778

Other· 5.5%

#e3dce0

Text· 7.4%

#dbeeee

Secondary· 6.9%

#8bbeb9

Secondary· 5.5%

#86d7be

Secondary· 4.4%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Social Media

LinkedIn WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

mc.stu.126.net(11)edu-cms.nosdn.127.net(4)acstatic-dun.126.net(2)zz.bdstatic.com(1)hm.baidu.com(1)

Website Identity

icourse163.org

12 years old

Location detected: 🇨🇳 Chinavia ip

Alibaba Cloud Computing (Beijing) Co., Ltd.zh

Sponsored

Last analyzed: 23 Apr 2026 at 03:03

Historical Analysis & Change Tracking