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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vi.wikipedia.org

https://vi.wikipedia.org· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

vi.wikipedia.org

$Desktop screenshot of vi.wikipedia.org$

$Mobile screenshot of vi.wikipedia.org$

Mobile

Sponsored

Hosting Provider

Wikimedia esams infra

IP Address

185.15.59.224

Server Location

🇳🇱 Amsterdam, The Netherlands

ASN

AS14907

Server

Apache Traffic Server

CDN

Performance

Page Speed

914 KB

61 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Wikimedia esams infra

CDN

Technology Stack

3 Technologies Detected

Frameworks

Alpine.js

Libraries

jQuery

CSS Frameworks

Tailwind CSS

SEO Analysis

C64/100

vi.wikipedia.orgvi.wikipedia.org

Wikipedia, bách khoa toàn thư mở

No description available for this page.

Title Length32 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Many images missing alt text (19/29)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

272 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

46%Poor

Interactive

HTTPS

No WAF

82d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

06.02.2026

Valid Until

07.05.2026

Subject Alternative Names (20)

*.m.mediawiki.org*.m.wikibooks.org*.m.wikidata.org*.m.wikimedia.org*.m.wikinews.org*.m.wikipedia.org*.m.wikiquote.org*.m.wikisource.org+12 more

SHA-256 Fingerprint

34:61:AA:F3:0B:87:E6:FF:B7:49:69:AE:7A:96:EF:A4:E8:E1:C6:A2...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ch

accept-ranges

bytes

age

75861

cache-control

🟡 0s(private, s-maxage=0, max-age=0, must-revalidate, no-transfor...)

content-encoding

📦 Gzip(gzip)

content-language

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

vi.wikipedia.org

Domain Age

25y 1m

Created

13.01.2001

Expires

13.01.2027

Last Updated

17.12.2025

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Linux Libertine + sans-serif

81/100

Readability

/30

40/40

16px · LH 1.63

Hierarchy

/20

13/25

1.8x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Linux Libertine

Sans29px

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

29px

19px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.62 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

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

⚠️ Cramped layout: 31 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

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(1)

Sponsored

Last analyzed: 14 Feb 2026 at 02:38

Historical Analysis & Change Tracking