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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formzu.net

https://formzu.net· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

formzu.net

Sponsored

Hosting Provider

Fujitsu Limited

IP Address

175.184.37.132

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS55374

Organization

Fujitsu Limited

Server

Nginx

Nameservers

03.dnsv.jp.04.dnsv.jp.01.dnsv.jp.02.dnsv.jp.

Performance

Page Speed

542 KB

55 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

CMS

WordPress

Infrastructure

Hosting

Fujitsu Limited

Technology Stack

10 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Segment

CSS Frameworks

Libraries

Payments

Web Servers

Languages

SEO Analysis

C64/100

formzu.netformzu.net

Formzu(フォームズ) 無料のフォーム作成クラウド 170万件突破

国内最大級のフォーム作成クラウドサービスです。問い合わせフォーム・申し込みフォーム・アンケートフォーム等にどうぞ。スマホ・タブレットからも使えます。

Title Length35 chars

Recommended: 50-60 chars

Description Length74 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (6/6)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

2 rules

Allows all crawlers

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

66d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Nijimo K.K.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

26.03.2025

Valid Until

26.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.formzu.comformzu.com

SHA-256 Fingerprint

F5:64:70:7E:D2:54:B5:C7:8D:71:0F:11:5B:F7:AF:60:7B:24:53:D1...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, private)

connection

keep-alive

content-type

text/html; charset=UTF-8

date

Thu, 19 Feb 2026 09:54:29 GMT

server

nginx/1.10.2

transfer-encoding

chunked

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.formzu.net

Domain Information

formzu.net

Domain Age

22y 4m

Created

16.10.2003

Expires

16.10.2028

Last Updated

28.07.2025

Registrar

GMO Internet Group, Inc. d/b/a Onamae.com

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Yu Gothic Medium

48/100

Readability

/30

40/40

45px · LH 1.43

Hierarchy

/20

8/25

0.31x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Yu Gothic Medium

Sans14px

Body Font

Yu Gothic Medium

Sans45px

Contrast Ratio

Reading Comfort

~42 CPL

Needs attention

14px

20px

14px

18px

45px

Major Second

Scale

✅ Excellent readability: 45px body text is ideal for all devices.

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

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

✅ Good performance: Using 1 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

5 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

platform.twitter.com(5)googletagmanager.com(3)local(3)google-analytics.com(1)ajax.googleapis.com(1)

Website Identity

Facebook X (Twitter)

Sponsored

Last analyzed: 19 Feb 2026 at 09:54

Historical Analysis & Change Tracking