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

segmentfault.com

https://segmentfault.com· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

segmentfault.com

Mobile

Sponsored

Hosting Provider

Alibaba Cloud

alibabacloud.com

IP Address

8.152.202.66

Server Location

🇨🇳 Beijing, China

ASN

AS37963

Organization

Alibaba.com LLC

Server

Tengine

Nameservers

ns3.dnsv3.com.ns4.dnsv3.com.

Performance

Page Speed

529 KB

51 requests

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Next.js

Styling

Tailwind CSS

Infrastructure

Hosting

Alibaba Cloud

Technology Stack

8 Technologies Detected

Analytics

Frameworks

Meta Frameworks

Other

CSS Frameworks

Icon Libraries

Web Servers

SEO Analysis

F35/100

segmentfault.comsegmentfault.com

SegmentFault 思否

SegmentFault 思否是中国专业的开发者技术社区。我们以技术问答、技术博客、技术课程、技术资讯为核心的产品形态，为开发者提供纯粹、高质的技术交流平台。

Title Length15 chars

Recommended: 50-60 chars

Description Length79 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

8 issues found

Upgrade to view details

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

82d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

07.02.2026

Valid Until

08.05.2026

Subject Alternative Names (2)

segmentfault.comsponsor.segmentfault.com

SHA-256 Fingerprint

8D:A9:98:21:D2:1A:6A:EC:F8:71:C3:8D:73:32:AB:46:2C:F8:47:E7...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(private, no-cache, no-store, max-age=0, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Sun, 15 Feb 2026 09:01:22 GMT

etag

"h110lqgtgd2qzf"

server

Tengine

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

MX Records (5)

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

alt3.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

segmentfault.com

Domain Age

15 years

Created

17.02.2011

Expires

17.02.2027

Last Updated

26.01.2026

Registrar

Alibaba Cloud Computing Ltd. d/b/a HiChina (www.net.cn)

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

system-ui

68/100

Readability

/30

32/40

14px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

system-ui

Sans

Body Font

system-ui

Sans14px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

16px

14px

Minor Second

Scale

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

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

⚠️ Cramped layout: 32 elements lack adequate spacing.

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

static.segmentfault.com(11)sponsor.segmentfault.com(3)hmcdn.baidu.com(1)static.geetest.com(1)hm.baidu.com(1)

Sponsored

Last analyzed: 15 Feb 2026 at 09:01

Historical Analysis & Change Tracking