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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freedownloadmanager.org

https://freedownloadmanager.org· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

Sponsored

Hosting Provider

Webzilla Inc

IP Address

74.117.181.203

Server Location

🇺🇸 Fort Lauderdale, United States

ASN

AS40824

Organization

Webzilla Inc

Server

Nginx

Nameservers

ns-1630.awsdns-11.co.uk.ns-366.awsdns-45.com.ns-1015.awsdns-62.net.ns-1344.awsdns-40.org.

Performance

Page Speed

1.8 MB

19 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Webzilla Inc

Technology Stack

6 Technologies Detected

Analytics

Libraries

CSS Frameworks

Web Servers

Languages

SEO Analysis

A82/100

freedownloadmanager.orgfreedownloadmanager.org

Free Download Manager - download everything from the internet

Free Download Manager accelerates all types of downloads (files, video, torrents). It's a smart and fast internet download manager for Windows and macOS.

Title Length61 chars

Recommended: 50-60 chars

Description Length153 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

9 rules

Sponsored

Security Score

31%Critical

Interactive

HTTPS

No WAF

214d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

30.12.2025

Valid Until

20.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.freedownloadmanager.orgfreedownloadmanager.org

SHA-256 Fingerprint

2D:1A:B4:D2:5C:C5:D3:2D:7F:DF:4F:69:0E:09:5A:15:D6:49:C4:3B...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Wed, 18 Feb 2026 06:54:51 GMT

server

nginx

vary

User-Agent, Accept-Encoding

x-frame-options

SAMEORIGIN

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

smtp.google.com

Domain Information

freedownloadmanager.org

Domain Age

21y 10m

Created

20.04.2004

Expires

20.04.2026

Last Updated

26.03.2025

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Roboto Condensed + Roboto

68/100

Readability

/30

40/40

20px · LH 1.50

Hierarchy

/20

18/25

2.2x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Roboto Condensed

Sans44px

Body Font

Roboto

Sans20px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

44px

36px

24px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

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

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

⚠️ 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

2 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(1)googletagmanager.com(1)

Website Identity

Facebook X (Twitter)

Sponsored

Last analyzed: 18 Feb 2026 at 06:55

Historical Analysis & Change Tracking