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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form-mailer.jp

https://form-mailer.jp· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

form-mailer.jp

Sponsored

Hosting Provider

Future Spirits Co., Ltd.

IP Address

219.99.161.161

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS23824

Organization

Future Spirits Co., Ltd.

Server

Apache

Nameservers

ns-689.awsdns-22.net.ns-104.awsdns-13.com.ns-1533.awsdns-63.org.ns-1771.awsdns-29.co.uk.

Performance

Page Speed

3 MB

132 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Nuxt.js

Infrastructure

Hosting

Future Spirits Co., Ltd.

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

9 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Icon Libraries

Tag Managers

Customer Support

Web Servers

SEO Analysis

A84/100

form-mailer.jpform-mailer.jp

フォームメーラー（FormMailer）無料でメールフォームが誰でも簡単に作れる

フォームメーラーは無料から始められるクラウド型メールフォーム作成サービス。お問い合わせ・注文・アンケートフォームを誰でも簡単に作れます。ランディングページや独自ドメイン対応の高機能な有料プランも業界最安値の価格帯でご利用可能です

Title Length40 chars

Recommended: 50-60 chars

Description Length114 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

153 URLs

robots.txt

7 rules

Allows all crawlers

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

338d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

22.12.2025

Valid Until

23.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.form-mailer.jpform-mailer.jp

SHA-256 Fingerprint

49:6B:69:FE:09:FA:E1:C3:8A:36:43:F0:7D:FB:F6:2A:B6:8E:59:E6...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Wed, 18 Feb 2026 06:16:13 GMT

last-modified

Tue, 17 Feb 2026 05:40:21 GMT

server

Apache

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

argw.fsi.ne.jp

Domain Information

form-mailer.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

-apple-system

83/100

Readability

/30

40/40

20px · LH 1.50

Hierarchy

/20

18/25

2.2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

-apple-system

Sans44px

Body Font

-apple-system

Sans20px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

44px

32px

29px

17px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

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

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

✅ Protected text on images: Using gradient for readability.

Business & Marketing Stack

4 Tools Detected

Advanced

Customer Support

FreshdeskMid-Market

Live chat and helpdesk tools

Behavior Analytics

Microsoft ClarityFree

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(12)googletagmanager.com(3)scripts.clarity.ms(1)google-analytics.com(1)cdn.channel.io(1)

Website Identity

Facebook X (Twitter)

Sponsored

Last analyzed: 18 Feb 2026 at 06:16

Historical Analysis & Change Tracking