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

freesound.org

https://freesound.org· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

freesound.org

Mobile

Sponsored

Hosting Provider

Anella Cientifica

IP Address

84.89.139.206

Server Location

🇪🇸 Barcelona, Spain

ASN

AS13041

Nameservers

ns-124-a.gandi.net.ns-178-b.gandi.net.ns-94-c.gandi.net.

Performance

Page Speed

517 KB

78 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Anella Cientifica

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

Meta Frameworks

Remix

Other

Mapbox GL

CSS Frameworks

Tailwind CSS

SEO Analysis

D52/100

freesound.orgfreesound.org

Freesound

Freesound: collaborative database of creative-commons licensed sound for musicians and sound lovers. Have you freed your sound today?

Title Length9 chars

Recommended: 50-60 chars

Description Length133 chars

Recommended: 120-160 chars

Issues (0)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

39 URLs

robots.txt

17 rules

Sitemap reference found

Sponsored

Security Score

30%Critical

Critical / Transactional

HTTPS

No WAF

277d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

18.11.2025

Valid Until

18.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.freesound.orgfreesound.org

SHA-256 Fingerprint

88:44:B1:80:F1:EE:BE:4B:E8:01:39:4B:97:3C:36:C9:3B:60:C1:27...

Top 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-type

text/html; charset=utf-8

cross-origin-opener-policy

same-origin

date

Sat, 14 Feb 2026 10:28:51 GMT

referrer-policy

same-origin, no-referrer-when-downgrade

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

fb.mail.gandi.net

spool.mail.gandi.net

Domain Information

freesound.org

Domain Age

23y 2m

Created

21.12.2002

Expires

21.12.2028

Last Updated

31.10.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

BlinkMacSystemFont

87/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

2.53x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

BlinkMacSystemFont

Sans38px

Body Font

BlinkMacSystemFont

Sans15px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

38px

28px

22px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.5x 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.

⚠️ Cramped layout: 62 elements lack adequate spacing.

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

PlausibleSMB

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)analytics.freesound.org(1)api.tiles.mapbox.com(1)api.mapbox.com(1)

Website Identity

X (Twitter)

Sponsored

Last analyzed: 14 Feb 2026 at 10:29

Historical Analysis & Change Tracking