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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blurb.com

https://blurb.com· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

blurb.com

$Desktop screenshot of blurb.com$

$Mobile screenshot of blurb.com$

Mobile

Sponsored

Hosting Provider

Blurb, Inc

IP Address

67.226.216.15

Server Location

🇺🇸 Tukwila, United States

ASN

AS399482

Organization

Blurb, Inc

Server

Nginx

Nameservers

ns-707.awsdns-24.net.ns-1213.awsdns-23.org.ns-1933.awsdns-49.co.uk.ns-58.awsdns-07.com.

Performance

Page Speed

1 KB

72 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Astro

Styling

Tailwind CSS

Infrastructure

Hosting

Blurb, Inc

Technology Stack

6 Technologies Detected

Meta Frameworks

CSS Frameworks

Fonts

Analytics

Tag Managers

Web Servers

SEO Analysis

A+94/100

blurb.comblurb.com

Custom Book Printing - Professional Book Printing Services | Blurb

Create and print custom books and magazines with Blurb’s professional book printing services. Perfect for photographers, self-publishers and creators.

Title Length66 chars

Recommended: 50-60 chars

Description Length150 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

1 URLs

robots.txt

238 rules

Sitemap reference found

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

199d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

30.07.2025

Valid Until

30.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (3)

*.blurb.comblurb.compdx-vcenter-01.blurb.com

SHA-256 Fingerprint

E3:6F:53:B1:5B:54:F9:39:F5:E0:6C:C9:BD:26:BC:25:EF:8F:C2:B1...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 0s(max-age=0)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Thu, 12 Feb 2026 18:57:49 GMT

expires

Thu, 12 Feb 2026 18:57:49 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

blurb-com.mail.protection.outlook.com

Domain Information

blurb.com

Domain Age

27y 11m

Created

26.03.1998

Expires

25.03.2032

Last Updated

25.03.2022

Registrar

eNom, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Futura PT-0018ffc6797be622 + sans-serif

81/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

18/25

5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Futura PT-0018ffc6797be622

Sans80px

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

80px

44px

32px

24px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 5.0x larger than body text.

✅ 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

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

12 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets.blurb.com(8)snippet.maze.co(2)

Website Identity

Facebook X (Twitter)Instagram YouTube Pinterest

Sponsored

Last analyzed: 12 Feb 2026 at 18:58

Historical Analysis & Change Tracking