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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56.com

https://56.com· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

56.com

Sponsored

Hosting Provider

Shanghaiwangsukejigufenyouxiang

IP Address

219.136.249.83

Server Location

🇨🇳 Guangzhou, China

ASN

AS4134

Organization

Shanghaiwangsukejigufenyouxiang

Server

OpenResty

Nameservers

ns14.sohu.com.ns12.sohu.com.ns15.sohu.com.ns11.sohu.com.+2 more

Performance

Page Speed

432 KB

118 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Shanghaiwangsukejigufenyouxiang

Technology Stack

2 Technologies Detected

Libraries

jQuery

Web Servers

OpenResty

SEO Analysis

D50/100

56.com56.com

56视频首页

56网是中国原创视频网站,免费上传搞笑逗趣生活视频，观看优质丰富的特色节目，关注感兴趣的原创导演和美女解说，快速分享及评论互动。"

Title Length6 chars

Recommended: 50-60 chars

Description Length65 chars

Recommended: 120-160 chars

Issues (2)

• Many images missing alt text (194/292)
• Missing viewport meta tag - page may not be mobile-friendly

7 issues found

Upgrade to view details

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

385d

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/2

Valid From

10.02.2026

Valid Until

08.03.2027

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.56.comsomama.comicaneasy.comwww.vicovico.comstat.qf.v-56.comv-56.comvicovico.comwww.somama.com+12 more

SHA-256 Fingerprint

CD:05:71:92:BC:3B:4F:3E:9F:BE:F6:40:6E:0D:34:8A:41:60:95:5D...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

age

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Mon, 16 Feb 2026 21:51:12 GMT

etag

W/"69938fed-416cf"

fss-cache

HIT from 3216672.4527402.4462388, HIT from 4346926.4609080.7...

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.56.com

Domain Information

56.com

Domain Age

27y 7m

Created

14.07.1998

Expires

13.07.2026

Last Updated

24.04.2025

Registrar

MarkMonitor Information Technology (Shanghai) Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

hiragino sans gb

6/100

Readability

/30

5/40

12px · LH 3.33

Hierarchy

/20

8/25

1x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

hiragino sans gb

Sans12px

Body Font

hiragino sans gb

Sans12px

Contrast Ratio

Reading Comfort

~151 CPL

Needs attention

12px

Minor Second

Scale

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

⚠️ Wide line spacing (3.33). Consider 1.4-1.8 for better flow.

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

✅ Good performance: Using 2 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.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

25 Resources

Scripts

Styles

Async

Defer

Top Script Sources

s1.56img.com(6)js.tv.itc.cn(4)s2.56img.com(2)a1.itc.cn(2)channel.56.com(1)

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Last analyzed: 16 Feb 2026 at 21:51

Historical Analysis & Change Tracking