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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jb51.net

https://jb51.net· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

jb51.net

Sponsored

Hosting Provider

Spartan Host Ltd

IP Address

194.147.100.3

Server Location

🇺🇸 Seattle, United States

ASN

AS201106

Organization

Spartan Host Ltd

Server

Anyscdn

Performance

Page Speed

5 KB

73 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Spartan Host Ltd

Technology Stack

2 Technologies Detected

Frameworks

Vue.js

Libraries

jQueryv1.11.3

SEO Analysis

F29/100

jb51.netjb51.net

脚本之家_www.jb51.net

脚本之家是国内专业的网站建设资源、脚本编程学习类网站，提供asp、php、asp.net、javascript、jquery、vbscript、dos批处理、网页制作、网络编程、网站建设等编程资料。

Title Length17 chars

Recommended: 50-60 chars

Description Length99 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (62/66)

8 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

10 rules

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

330d

Certificate Details

Type

Domain Validated (DV)

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

15.12.2025

Valid Until

16.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.jb51.netjb51.net

SHA-256 Fingerprint

8A:48:A8:D9:B0:85:42:23:C9:C9:24:9D:33:B3:63:0A:B6:5B:5D:C3...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Thu, 19 Feb 2026 16:59:44 GMT

etag

W/"80aad2fbea1dc1:0"

last-modified

Thu, 19 Feb 2026 16:38:33 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

jb51.net

Domain Age

19y 7m

Created

22.07.2006

Expires

15.05.2034

Last Updated

09.01.2026

Registrar

Chengdu West Dimension Digital Technology Co., Ltd.

DNSSEC

Not Enabled

Typography & Readability

tahoma

28/100

Readability

/30

17/40

14px · LH 3.00

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

tahoma

Body Font

tahoma

Sans14px

Contrast Ratio

Reading Comfort

~72 CPL

Optimal (45–75)

13px

14px

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

⚠️ Wide line spacing (3.00). Consider 1.4-1.8 for better flow.

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

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

✅ Optimal line length: ~72 characters per line is comfortable to read.

⚠️ Cramped layout: 75 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

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

apps.bdimg.com(3)common.jbzj.com(3)hm.baidu.com(1)cpro.baidustatic.com(1)

Website Identity

Sponsored

Last analyzed: 19 Feb 2026 at 17:00

Historical Analysis & Change Tracking