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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douyin.com

https://douyin.com· First analyzed 11 Feb 2026· Updated 11 Feb 2026

Export

douyin.com

Mobile

Sponsored

Hosting Provider

BeiJing Teamsun Technology Co.

IP Address

122.14.229.64

Server Location

🇨🇳 Beijing, China

ASN

AS9808

Organization

BeiJing Teamsun Technology Co.

Server

Tengine

Nameservers

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

Performance

Page Speed

157 KB

250 requests

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

BeiJing Teamsun Technology Co.

Detected API Sources

https://privacy.zijieapi.com/a...

Technology Stack

7 Technologies Detected

CSS Frameworks

Other

Other

Advertising

Web Servers

Analytics

SEO Analysis

F35/100

douyin.comdouyin.com

抖音-记录美好生活

抖音让每一个人看见并连接更大的世界，鼓励表达、沟通和记录，激发创造，丰富人们的精神世界，让现实生活更美好。

Title Length9 chars

Recommended: 50-60 chars

Description Length53 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (28/29)

7 issues found

Upgrade to view details

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

41d

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-credentials

true

cache-control

🔴 No Cache(no-store)

content-encoding

⚡ Brotli(br)

content-security-policy

upgrade-insecure-requests ;frame-ancestors https://pc.xgo.by...

content-security-policy-report-only

upgrade-insecure-requests ;frame-ancestors https://pc.xgo.by...

content-type

text/html; charset=utf-8

Good Warning Issue

Typography & Readability

PingFang SC

50/100

Readability

/30

12/40

10px · LH 2.00

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

PingFang SC

Body Font

PingFang SC

Sans10px

Contrast Ratio

Reading Comfort

Single Family

left aligned

10px

❌ Critical: 10px body text is too small. Increase to at least 14px.

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 15 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

lf-rc1.yhgfb-cn-static.com(3)lf-douyin-pc-web.douyinstatic.com(2)lf-douyin-pc-web-back.douyinstatic.com(2)lf-static.applogcdn.com(2)lf-c-flwb.bytetos.com(2)

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Last analyzed: 11 Feb 2026 at 03:59

Historical Analysis & Change Tracking