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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tenki.jp

https://tenki.jp· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

tenki.jp

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.164.206.119

Server Location

🇫🇮 Helsinki, Finland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

Nginx

CDN

CloudFront

Nameservers

ns-1996.awsdns-57.co.uk.ns-209.awsdns-26.com.ns-966.awsdns-56.net.ns-1374.awsdns-43.org.

Performance

Page Speed

641 KB

187 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Technology Stack

18 Technologies Detected

Advertising

Google Ads Google AdSense TikTok Pixel Criteo Taboola Outbrain

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Microsoft Clarity

Libraries

CSS Frameworks

Icon Libraries

Fonts

Tag Managers

Other

Payments

Web Servers

SEO Analysis

C67/100

tenki.jptenki.jp

日本気象協会 tenki.jp / 天気予報・地震・台風

日本気象協会公式の天気予報専門メディアです。市区町村別のピンポイントな天気予報に加え、専門的な気象情報、地震・津波などの防災情報を提供します。気象予報士が日々更新する日直予報士、花粉や熱中症、スキー積雪などの季節特集も人気です。

Title Length28 chars

Recommended: 50-60 chars

Description Length114 chars

Recommended: 120-160 chars

Issues (1)

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

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

9 rules

Sitemap reference found

Sponsored

Security Score

25%Critical

Critical / Transactional

HTTPS

No WAF

355d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

12.01.2026

Valid Until

10.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.tenki.jptenki.jp

SHA-256 Fingerprint

05:1A:CE:26:47:4C:91:D4:09:9E:FD:30:6E:49:EF:6F:AF:AE:56:FF...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Fri, 20 Feb 2026 08:23:44 GMT

referrer-policy

strict-origin-when-cross-origin

server

nginx

strict-transport-security

max-age=86400; preload

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

silverzebra7.sakura.ne.jp

Domain Information

tenki.jp

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Data Protection Officer mentioned

Legitimate interest basis mentioned

Typography & Readability

Meiryo

21/100

Readability

/30

5/40

12px · LH 1.00

Hierarchy

/20

15/25

1.33x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Meiryo

Sans16px

Body Font

Meiryo

Sans12px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

16px

14px

12px

❌ Critical: 12px body text is too small. Increase to at least 14px.

⚠️ Tight line spacing (1.00). Consider 1.4-1.6 for better readability.

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

✅ Good performance: Using 2 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 Buy on MyFonts

Business & Marketing Stack

8 Tools Detected

Enterprise

Behavior Analytics

Microsoft ClarityFree

Google Tag ManagerFree

Google AnalyticsFree

Matomo (Piwik)Mid-Market

User behavior and product analytics

Advertising

Facebook PixelMid-Market

TikTok PixelMid-Market

TaboolaMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(4)analytics.tiktok.com(3)dmp.im-apps.net(2)connect.facebook.net(2)cdn.microad.jp(1)

Website Identity

Facebook X (Twitter)Instagram

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Last analyzed: 20 Feb 2026 at 08:24

Historical Analysis & Change Tracking