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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36kr.com

https://36kr.com· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

36kr.com

Mobile

Sponsored

Hosting Provider

Hebei Sea Whale Technology Co. Ltd.

IP Address

103.143.17.146

Server Location

🇨🇳 Haidian, China

ASN

AS134760

Organization

Hebei Sea Whale Technology Co. Ltd.

Server

Nginx

Nameservers

vip3.alidns.com.vip4.alidns.com.

Performance

Page Speed

1 KB

46 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Hebei Sea Whale Technology Co. Ltd.

Technology Stack

3 Technologies Detected

CSS Frameworks

Tailwind CSS

Web Servers

Nginx

Analytics

FullStory

SEO Analysis

D47/100

36kr.com36kr.com

36氪_让一部分人先看到未来

36氪通过全面，独家的视角为用户深度剖析最前沿的资讯，致力于让一部分人先看到未来，内容涵盖快讯，科技，金融，投资，房产，汽车，互联网，股市，教育，生活，职场等，秉承着新商业媒体人的使命砥砺前行

Title Length14 chars

Recommended: 50-60 chars

Description Length96 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

14 URLs

robots.txt

15 rules

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

63d

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

01.04.2025

Valid Until

17.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.36kr.com36kr.com

SHA-256 Fingerprint

5F:8D:88:D3:BE:FB:66:64:79:EE:11:18:C9:E7:26:68:57:1B:33:7C...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

connection

content-encoding

⚡ Brotli(br)

content-type

text/html

date

Fri, 13 Feb 2026 23:03:07 GMT

proxy-status

9999999200061000

server

nginx

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mxbiz1.qq.com

mxbiz2.qq.com

Domain Information

36kr.com

Domain Age

15y 4m

Created

07.10.2010

Expires

18.09.2026

Last Updated

24.07.2025

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

PingFang SC

69/100

Readability

/30

40/40

20px · LH 1.40

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

PingFang SC

Body Font

PingFang SC

Sans20px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 33 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

14 Resources

Scripts

Styles

Async

Defer

Top Script Sources

staticx.36krcdn.com(5)zz.bdstatic.com(2)hm.baidu.com(2)static.sensorsdata.cn(1)

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Last analyzed: 13 Feb 2026 at 23:03

Historical Analysis & Change Tracking