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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libsdl.org

https://libsdl.org· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

libsdl.org

Sponsored

Hosting Provider

Hetzner

hetzner.com

IP Address

135.181.166.85

Server Location

🇫🇮 Helsinki, Finland

ASN

AS24940

Organization

Hetzner

Server

Apache

Nameservers

ns3.dreamhost.com.ns1.dreamhost.com.ns2.dreamhost.com.

Performance

Page Speed

230 KB

10 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Hetzner

Technology Stack

1 Technologies Detected

Web Servers

Apachev2.4.58

SEO Analysis

D47/100

libsdl.orglibsdl.org

Simple DirectMedia Layer - Homepage

No description available for this page.

Title Length35 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Missing viewport meta tag - page may not be mobile-friendly

6 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

4 rules

Sponsored

Security Score

76%Good

Static / Informational

HTTPS

No WAF

33d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

26.12.2025

Valid Until

26.03.2026

Subject Alternative Names (17)

3ds.hg.libsdl.orgbugzilla-attachments.libsdl.orgbugzilla.libsdl.orgbuildbot.libsdl.orgexamples.libsdl.orgforums.libsdl.orggit.libsdl.orghg.libsdl.org+9 more

SHA-256 Fingerprint

4A:77:1E:5A:56:3F:81:E6:BD:2A:7C:4C:FF:22:23:4E:1A:5B:4C:B2...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

1581

content-type

text/html; charset=UTF-8

date

Fri, 20 Feb 2026 04:04:57 GMT

keep-alive

timeout=5, max=100

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mx1.mailchannels.net

mx2.mailchannels.net

Domain Information

libsdl.org

Domain Age

25y 8m

Created

01.06.2000

Expires

01.06.2026

Last Updated

25.06.2025

Registrar

Domain.com - Network Solutions, LLC

DNSSEC

Not Enabled

Typography & Readability

Poppins

59/100

Readability

/30

40/40

16px · LH 1.60

Hierarchy

/20

18/25

2x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Poppins

Sans32px

Body Font

Poppins

Sans16px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

32px

16px

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

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

✅ Good performance: Using 1 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.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

3 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(1)

Website Identity

GitHub

Sponsored

Last analyzed: 20 Feb 2026 at 04:05

Historical Analysis & Change Tracking