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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libreoffice.org

https://libreoffice.org· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

libreoffice.org

Mobile

Sponsored

Hosting Provider

Hetzner

hetzner.com

IP Address

188.245.171.22

Server Location

🇩🇪 Falkenstein, Germany

ASN

AS24940

Organization

Hetzner

Server

Nginx

Nameservers

hydrogen.ns.hetzner.com.oxygen.ns.hetzner.com.helium.ns.hetzner.de.

Performance

Page Speed

574 KB

26 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

CMS

SilverStripe

Infrastructure

Hosting

Hetzner

Technology Stack

8 Technologies Detected

CSS Frameworks

Libraries

Other

Icon Libraries

Fonts

Analytics

Web Servers

SEO Analysis

D58/100

libreoffice.orglibreoffice.org

Home | LibreOffice - Free and private office suite - Based on OpenO...

Free office suite – the evolution of OpenOffice. Compatible with Microsoft .doc, .docx, .xls, .xlsx, .ppt, .pptx. Updated regularly, community powered.

Title truncated.

Title Length100 chars

Recommended: 50-60 chars

Description Length151 chars

Recommended: 120-160 chars

Issues (0)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

1 URLs

robots.txt

Sponsored

Security Score

51%Poor

Interactive

HTTPS

No WAF

41d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

26.12.2025

Valid Until

26.03.2026

Subject Alternative Names (20)

ar.libreoffice.orgbg.libreoffice.orgbn.libreoffice.orgbo.libreoffice.orgbrx.libreoffice.orgca.libreoffice.orgconference.libreoffice.orgcs.libreoffice.org+12 more

SHA-256 Fingerprint

2F:1B:75:28:18:DB:B9:1D:EA:08:29:69:82:8C:AA:EF:F2:74:9B:F4...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

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

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self'

content-type

text/html; charset=utf-8

date

Thu, 12 Feb 2026 11:38:30 GMT

last-modified

Tue, 10 Feb 2026 10:36:51 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

mx3.heinlein-support.de

mx2.heinlein-support.de

mx1.heinlein-support.de

Domain Information

libreoffice.org

Domain Age

15y 6m

Created

13.08.2010

Expires

13.08.2026

Last Updated

25.11.2025

Registrar

Key-Systems GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Lato

55/100

Readability

/30

5/40

12px · LH 3.00

Hierarchy

/20

25/25

6.08x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Lato

Sans73px

Body Font

Lato

Sans12px

Contrast Ratio

Reading Comfort

~46 CPL

Optimal (45–75)

73px

40px

34px

12px

❌ Critical: 12px body text is too small. Increase to at least 14px.

⚠️ Wide line spacing (3.00). Consider 1.4-1.8 for better flow.

✅ Strong hierarchy: Headlines are 6.1x larger than body text.

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

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

✅ Protected text on images: Using text-shadow for readability.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)piwik.documentfoundation.org(1)themes(1)

Website Identity

Facebook X (Twitter)YouTube Reddit

Sponsored

Last analyzed: 12 Feb 2026 at 11:38

Historical Analysis & Change Tracking