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

fc2.com

https://fc2.com· First analyzed 11 Feb 2026· Updated 11 Feb 2026

Export

fc2.com

Mobile

Sponsored

Hosting Provider

FC2SV5

IP Address

199.48.210.152

Server Location

🇺🇸 Las Vegas, United States

ASN

AS63210

Organization

FC2SV5

Server

Nginx

Nameservers

ns-214.awsdns-26.com.ns-616.awsdns-13.net.ns-1489.awsdns-58.org.ns-1834.awsdns-37.co.uk.

Performance

Page Speed

95 KB

27 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

FC2SV5

Technology Stack

4 Technologies Detected

Analytics

Libraries

Web Servers

SEO Analysis

D52/100

fc2.comfc2.com

FC2 - Free Website, Analyzer, Blog, Rental Server, SEO Countermeasu...

FC2 is a portal site which brings you a pleasant web life providing blog/website/analyzer services and others. Our blog service is ranked No.2 domestically a...

Title truncated. Description truncated.

Title Length78 chars

Recommended: 50-60 chars

Description Length277 chars

Recommended: 120-160 chars

Issues (1)

• Missing viewport meta tag - page may not be mobile-friendly

7 issues found

Upgrade to view details

Sponsored

A+

Security Score

91%Excellent

Static / Informational

HTTPS

No WAF

147d

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'none'

content-type

text/html

date

Wed, 11 Feb 2026 02:02:14 GMT

etag

W/"698be2b1-374f"

last-modified

Wed, 11 Feb 2026 02:00:17 GMT

Good Warning Issue

Typography & Readability

Verdana + arial

52/100

Readability

/30

32/40

15px · LH 1.40

Hierarchy

/20

15/25

1.47x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Verdana

Sans22px

Body Font

arial

Sans15px

Contrast Ratio

Reading Comfort

~67 CPL

Optimal (45–75)

22px

17px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

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

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

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

✅ Optimal line length: ~67 characters per line is comfortable to read.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

fc2.com(3)static.fc2.com(3)connect.facebook.net(2)ssl.google-analytics.com(2)local(1)

Sponsored

Last analyzed: 11 Feb 2026 at 02:02

Historical Analysis & Change Tracking