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.

Back to Search

flipbookpdf.net

https://flipbookpdf.net· First analyzed 25 Apr 2026· Updated 25 Apr 2026

Export

flipbookpdf.net

Mobile

Sponsored

Hosting Provider

InterServer

interserver.net

IP Address

69.10.41.146

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Secaucus, United States

ASN

AS19318

Organization

Interserver, Inc

Server

Apache

CDN

Cloudflare

WAF

Cloudflare

Nameservers

nola.ns.cloudflare.com.sid.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

788 ms10%

Speed Index

1.0 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

893 KB

48 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

InterServer

CDN

Cloudflare

Technology Stack

15 Technologies Detected

Advertising

Google Ads Google AdSense Criteo Outbrain

CSS Frameworks

Bootstrapv3.3.6

Tailwind CSS

Icon Libraries

Font Awesome Material Icons

Analytics

Libraries

Fonts

Payments

Web Servers

Security

SEO Analysis

D54/100

Meta Tags10/15

Content10/12

Headings6/8

Technical11/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile3/4

Indexability3/3

flipbookpdf.netflipbookpdf.net

FlipBook PDF - Free Online PDF to Flipbook conversion

No description available for this page.

Title Length53 chars

Recommended: 50-60 chars (~316px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Most images missing alt text (9/11) — critical for accessibility and SEO

12 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

3 rules

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F31/100

Bot Access

20/25

Machine Read.

3/25

Schema Data

0/25

Citation

8/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

header/footer

Text ratio:12%

Words:8,757

Token eff.:Excessive

Sections/1K:2.2

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary21w

Descriptive Headingsavg 3.9w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

50/100

Passed

Critical

Warnings

Images & Alt Text

5/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

10/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

5/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

11/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

4/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

5 recommendations

•Accessibility recommendation preview...

Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

30/100

110 mg

CO₂e / view

893.0 KB

Page Weight

80%

Cleaner Than

New Visitor

126 mg

Returning (cached)

63 mg

Annual (10K/mo)

13.2 kg

Emission Segments

Data Center

25 mg

Network

27 mg

Device

59 mg

Resource Breakdown

JavaScript

408.7 KB

Images

127.4 KB

CSS

316.6 KB

Fonts

8.6 KB

HTML

23.8 KB

Other

7.9 KB

Green Hosting Not Verified

InterServer

6 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

45d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

12.03.2026

Valid Until

10.06.2026

Subject Alternative Names (8)

cpanel.flipbookpdf.netcpcalendars.flipbookpdf.netcpcontacts.flipbookpdf.netflipbookpdf.netmail.flipbookpdf.netwebdisk.flipbookpdf.netwebmail.flipbookpdf.netwww.flipbookpdf.net

SHA-256 Fingerprint

0B:16:36:22:18:28:B7:35:C3:E2:A9:11:45:51:FD:41:15:D6:03:D6...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

connection

Keep-Alive

content-type

text/html; charset=UTF-8

date

Sat, 25 Apr 2026 17:13:37 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

keep-alive

timeout=5, max=100

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

flipbookpdf.net

Domain Information

flipbookpdf.net

Domain Age

6y 9m

Created

08.07.2019

Expires

08.07.2027

Last Updated

08.04.2026

Registrar

Tucows Domains Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Legitimate interest basis mentioned

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

69/100

Mobile Friendly14 breakpoints

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1.0

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Open Sans + Arial

WCAG Partial

54/100

Readability

/30

14/30

15px · LH 2.13

Hierarchy

/20

13/20

1.2x ratio · ✓ H1→H6

WCAG

/25

13/25

1:1 min contrast

Performance

/25

14/25

System fonts

Heading Font

Open Sans

Sans18px

Body Font

Arial

Sans15px

Contrast Ratio

1:1

9 issues

Reading Comfort

~34 CPL

Narrow lines

18px

48px

30px

15px

Major Sixth

Scale

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Wide line spacing (2.13). 1.4–1.6 is optimal for body text.

⚠️ Partial contrast: 9 elements below WCAG AA threshold (min 1.0:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

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

✅ System fonts: Zero font loading delay — best possible LCP impact.

GGoogle FontsFlesch 55

Color Palette

6 unique colors

6.19:1 AA Dark

#616161

Other· 32.2%

#ffffff

Background· 22.7%

#0f1c25

Primary· 37.00000000000001%

#c0c8d1

Secondary· 3.6%

#3a639a

Secondary· 1.4%

Business & Marketing Stack

3 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

A/B Testing & Optimization

ConvertMid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

pagead2.googlesyndication.com(3)googletagmanager.com(2)fundingchoicesmessages.google.com(2)local(2)livehelpnow.net(2)

Website Identity

flipbookpdf.net

6 years old

Location detected: 🇺🇸 United Statesvia ip

Tucows Domains Inc.

Sponsored

Last analyzed: 25 Apr 2026 at 17:14

Historical Analysis & Change Tracking