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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privacymark.jp

https://privacymark.jp· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

privacymark.jp

Sponsored

Hosting Provider

SAKURA

IP Address

59.106.210.143

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS9370

Organization

SAKURA

Server

Apache

Nameservers

ns020-8qltdfr09uba36n7.8.d-53.net.ns020-8qltdfr09uba36n7.8.d-53.info.ns020-8qltdfr09uba36n7.8.d-53.jp.

Performance

Page Speed

2.8 MB

58 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

SAKURA

Technology Stack

8 Technologies Detected

Analytics

Libraries

UI Components

CSS Frameworks

Fonts

Tag Managers

Web Servers

SEO Analysis

B72/100

privacymark.jpprivacymark.jp

プライバシーマーク制度｜一般財団法人日本情報経済社会推進協会（JIPDEC）

プライバシーマーク制度は、事業者の個人情報の取扱いが適切であるかを評価し、基準に適合した事業者に”プライバシーマーク”の使用を認める制度です。

Title Length38 chars

Recommended: 50-60 chars

Description Length71 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (28/50)

3 issues found

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Crawlability

Sitemap

Type: standard

60 URLs

robots.txt

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

186d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Cybertrust Japan Co., Ltd.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

22.07.2025

Valid Until

22.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.privacymark.jpprivacymark.jp

SHA-256 Fingerprint

24:F9:EB:FE:D6:6B:45:16:4A:C1:8E:CD:E1:79:48:3E:24:7F:95:E4...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

11595

content-type

text/html; charset=UTF-8

date

Tue, 17 Feb 2026 02:37:53 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

privacymark.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Noto Sans JP + sans-serif

54/100

Readability

/30

25/40

22px · LH 2.13

Hierarchy

/20

8/25

0.86x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Noto Sans JP

Sans19px

Body Font

sans-serif

Sans22px

Contrast Ratio

Reading Comfort

~44 CPL

Needs attention

19px

30px

22px

Golden Ratio

Scale

✅ Excellent readability: 22px body text is ideal for all devices.

⚠️ Wide line spacing (2.12). Consider 1.4-1.8 for better flow.

⚠️ 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.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

GGoogle Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(13)googletagmanager.com(2)support-widget.userlocal.jp(1)ajax.googleapis.com(1)

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Last analyzed: 17 Feb 2026 at 02:38

Historical Analysis & Change Tracking