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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jewishvirtuallibrary.org

https://jewishvirtuallibrary.org· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.18.14.169

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

rosa.ns.cloudflare.com.rocky.ns.cloudflare.com.

Performance

Page Speed

9 MB

158 requests

Image Optimization

Lazy LoadWebP

0–49

50–89

90–100

Architecture Stack

JAMstack

⚙️ SSR

Decoupled

Frontend

Framework

Nuxt.js

Styling

Tailwind CSS

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Detected API Sources

https://cdn.id5-sync.com/api/1...

Technology Stack

12 Technologies Detected

Icon Libraries

Font Awesome Material Icons

Analytics

Meta Frameworks

Libraries

CSS Frameworks

Fonts

Tag Managers

Email Marketing

Advertising

CDN

SEO Analysis

D52/100

jewishvirtuallibrary.orgjewishvirtuallibrary.org

Jewish Virtual Library

Explore 60,000 articles and nearly 10,000 photographs and maps related to Jewish history, Israel, Israel–United States relations, the Holocaust, antisemitism...

Description truncated.

Title Length22 chars

Recommended: 50-60 chars

Description Length290 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (29/29)

5 issues found

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Crawlability

Sitemap

robots.txt

2 rules

Allows all crawlers

Sponsored

Security Score

26%Critical

Interactive

HTTPS

WAF

81d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

07.02.2026

Valid Until

09.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

jewishvirtuallibrary.org*.jewishvirtuallibrary.org

SHA-256 Fingerprint

2D:A8:86:F4:F6:08:4E:1E:CF:1B:0A:E8:6B:BE:31:07:A3:B3:F2:B2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

date

Mon, 16 Feb 2026 07:23:35 GMT

content-type

text/html;charset=utf-8

cache-control

🔴 No Cache(private, max-age=0, must-revalidate, no-cache, no-store)

display

orig_site_sol

expires

Sun, 15 Feb 2026 07:23:35 GMT

response

200

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

MX Records (3)

mx1-us1.ppe-hosted.com

jewishvirtuallibrary-org.mail.protection.outlook.com

mx2-us1.ppe-hosted.com

Domain Information

jewishvirtuallibrary.org

Domain Age

25y 4m

Created

10.10.2000

Expires

10.10.2026

Last Updated

06.10.2025

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Legitimate interest basis mentioned

Typography & Readability

Helvetica Neue

63/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

28px

30px

16px

Minor Second

Scale

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

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

⚠️ Risky: Text appears on background images without overlay protection.

✅ Clean layout: Consistent left alignment throughout.

GGoogle Fonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(8)googletagmanager.com(3)the.gatekeeperconsent.com(2)privacy.gatekeeperconsent.com(2)secure.quantserve.com(1)

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Last analyzed: 16 Feb 2026 at 07:24

Historical Analysis & Change Tracking