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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keio.ac.jp

https://keio.ac.jp· First analyzed 13 Feb 2026· Updated 13 Feb 2026

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keio.ac.jp

Mobile

Sponsored

Hosting Provider

KEIO

IP Address

131.113.131.113

Server Location

🇯🇵 Toranomon, Japan

ASN

AS38635

Organization

KEIO

Server

Nginx

Nameservers

a1-123.akam.net.a3-64.akam.net.a14-66.akam.net.a5-66.akam.net.+2 more

Performance

Page Speed

39 MB

72 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

KEIO

Technology Stack

4 Technologies Detected

Analytics

Libraries

Web Servers

SEO Analysis

D58/100

keio.ac.jpkeio.ac.jp

Keio University

Keio University is a leading research university committed to excellence and innovation in education, research and medicine. It is located in central Tokyo.

Title Length15 chars

Recommended: 50-60 chars

Description Length156 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (47/61)

5 issues found

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Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

301d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

09.12.2025

Valid Until

11.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.keio.ac.jp

SHA-256 Fingerprint

04:94:8F:27:7D:B2:EB:32:EA:AC:0E:4A:D0:0E:EF:EF:0B:D2:0E:B2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-length

8593

content-type

text/html

date

Fri, 13 Feb 2026 12:40:28 GMT

etag

W/"698aafb4-785a"

last-modified

Tue, 10 Feb 2026 04:10:28 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

vmx2.m0.keio.ac.jp

Domain Information

keio.ac.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Gotham SSm A

11/100

Readability

/30

5/40

12px · LH 1.00

Hierarchy

/20

8/25

1x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Gotham SSm A

Sans12px

Body Font

Gotham SSm A

Sans12px

Contrast Ratio

Reading Comfort

~48 CPL

Optimal (45–75)

12px

66px

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 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

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets(6)googletagmanager.com(1)google.com(1)

Website Identity

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 13 Feb 2026 at 12:40

Historical Analysis & Change Tracking