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

58.com

https://58.com· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

58.com

Mobile

Sponsored

Hosting Provider

Tencent Cloud

cloud.tencent.com

IP Address

43.144.202.142

Server Location

🇨🇳 Beijing, China

ASN

AS45090

Organization

Tencent Cloud Computing (Beijing) Co., Ltd

Server

Tengine

Nameservers

ns3.dnsv5.com.ns4.dnsv5.com.

Performance

Page Speed

696 KB

50 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Tencent Cloud

Technology Stack

3 Technologies Detected

Libraries

jQueryv3.7.1

CSS Frameworks

Tailwind CSS

Web Servers

Tengine

SEO Analysis

F29/100

58.com58.com

【58同城 58.com】北京分类信息 - 本地免费高效

No description available for this page.

Title Length30 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 (14/18)

8 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

390 URLs

robots.txt

4 rules

Allows all crawlers

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

53d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

07.03.2025

Valid Until

08.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (9)

*.58.comapiwmda.58.com.cnjxedt.comxueche.com*.jxedt.com*.m.58.com*.vip.58.com*.xueche.com+1 more

SHA-256 Fingerprint

10:BB:D6:81:F5:33:EE:BD:81:C8:A5:AE:12:95:FA:6A:A3:B4:9B:6B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Fri, 13 Feb 2026 22:43:08 GMT

etag

W/"119455-1758196604000"

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mxbiz2.qq.com

mxbiz1.qq.com

Domain Information

58.com

Domain Age

27y 7m

Created

10.07.1998

Expires

09.07.2030

Last Updated

26.07.2022

Registrar

eName Technology Co., Ltd.

DNSSEC

Not Enabled

Typography & Readability

Hiragino Sans GB

31/100

Readability

/30

20/40

12px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Hiragino Sans GB

Sans

Body Font

Hiragino Sans GB

Sans12px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

12px

Minor Second

Scale

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

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

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

⚠️ Cramped layout: 37 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

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

j1.58cdn.com.cn(13)ss.xgo-img.com.cn(2)brandadshowjs.58.com(2)stat-58home.58che.com(2)sta.58che.com(1)

Sponsored

Last analyzed: 13 Feb 2026 at 22:43

Historical Analysis & Change Tracking

58.com

【58同城 58.com】北京分类信息 - 本地 免费 高效

【58同城 58.com】北京分类信息 - 本地免费高效