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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53kf.com

https://53kf.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

53kf.com

Sponsored

Hosting Provider

China Unicom Zhejiang Province Network

IP Address

101.66.249.208

Server Location

🇨🇳 Hangzhou, China

ASN

AS4837

Server

OpenResty

Nameservers

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

Performance

Page Speed

8.3 MB

118 requests

Image Optimization

WebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

China Unicom Zhejiang Province Network

Technology Stack

5 Technologies Detected

Other

Libraries

Analytics

Web Servers

SEO Analysis

D41/100

53kf.com53kf.com

客服系统_在线客服系统_网站客服系统_智能客服系统【53快服】

53KF客服系统作为行业领先品牌。入口全渠道覆盖，界面外观高度自定义，客服全链路工作平台。智能机器人辅助接待，全维度数据分析报表，帮助企业提高销售额、提升留存率、减少人工成本。

Title Length31 chars

Recommended: 50-60 chars

Description Length88 chars

Recommended: 120-160 chars

Issues (2)

• Many images missing alt text (40/68)
• Missing viewport meta tag - page may not be mobile-friendly

8 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

85d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.0

Valid From

14.05.2025

Valid Until

13.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.53kf.com53kf.com

SHA-256 Fingerprint

76:70:4D:CC:BF:14:9A:44:68:9F:FD:51:A7:12:43:4F:A7:F0:3C:E8...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟣 Private(private, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Tue, 17 Feb 2026 04:15:42 GMT

server

openresty

transfer-encoding

chunked

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mx.mail.ym.163.com

Domain Information

53kf.com

Domain Age

20y 3m

Created

07.11.2005

Expires

07.11.2030

Last Updated

10.10.2025

Registrar

Chengdu West Dimension Digital Technology Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

-apple-system + Arial

43/100

Readability

/30

10/40

12px · LH --

Hierarchy

/20

8/25

1.33x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

-apple-system

Sans16px

Body Font

Arial

Sans12px

Contrast Ratio

Reading Comfort

Dual Sans-Serif

left aligned

16px

24px

16px

12px

Minor Second

Scale

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

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 45 elements lack adequate spacing.

⚠️ Inconsistent alignment: Mix of left/center/right creates visual noise.

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

A/B Testing & Optimization

VWO (Visual Website Optimizer)Mid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

www7c2.53kf.com(3)js(3)trail.53kf.com(3)..(2)accwww7c2.53kf.com(1)

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Last analyzed: 17 Feb 2026 at 04:16

Historical Analysis & Change Tracking