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

bt.cn

https://bt.cn· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

bt.cn

Mobile

Sponsored

Hosting Provider

China Unicom CHINA169 Guangdong Network

IP Address

157.255.129.251

Server Location

🇨🇳 Guangzhou, China

ASN

AS134543

Server

OpenResty

Nameservers

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

Performance

Page Speed

4.6 MB

32 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Astro

Styling

Tailwind CSS

Infrastructure

Hosting

China Unicom CHINA169 Guangdong Network

Technology Stack

9 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Icon Libraries

Advertising

Microsoft Advertising

Web Servers

OpenResty

Customer Support

Zendesk

SEO Analysis

A82/100

bt.cnbt.cn

宝塔面板(bt.cn) 简单好用的Linux/Windows服务器运维管理面板

宝塔(bt.cn)，让运维简单高效。面板支持Linux与Windows系统。一键配置：LAMP/LNMP、网站、数据库、FTP、SSL，通过Web端轻松管理服务器。

Title Length39 chars

Recommended: 50-60 chars

Description Length82 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

118 URLs

robots.txt

3 rules

Sponsored

Security Score

86%Very Good

Static / Informational

HTTPS

No WAF

183d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

sslTrus

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

20.10.2025

Valid Until

17.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.bt.cnbt.cn

SHA-256 Fingerprint

4D:F1:0B:17:BB:70:FF:CE:EE:F0:94:7F:C0:D2:78:B2:E8:89:B0:3F...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

server

openresty

date

Sun, 15 Feb 2026 04:30:37 GMT

content-type

text/html

last-modified

Sun, 15 Feb 2026 04:30:02 GMT

vary

Accept-Encoding

etag

W/"69914bca-16834"

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mail.bt.cn

Domain Information

bt.cn

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

LarkHackSafariFont

68/100

Readability

/30

32/40

14px · LH 1.63

Hierarchy

/20

25/25

4x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

LarkHackSafariFont

Sans56px

Body Font

LarkHackSafariFont

Sans14px

Contrast Ratio

Reading Comfort

~202 CPL

Needs attention

56px

48px

36px

14px

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

✅ Optimal line spacing: 1.62 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.0x larger than body text.

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

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

✅ Protected text on images: Using gradient for readability.

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)hm.baidu.com(1)

Website Identity

GitHub

Sponsored

Last analyzed: 15 Feb 2026 at 04:30

Historical Analysis & Change Tracking