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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limesurvey.org

https://limesurvey.org· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

limesurvey.org

Mobile

Sponsored

Hosting Provider

Hetzner

hetzner.com

IP Address

176.9.146.178

Server Location

🇩🇪 Falkenstein, Germany

ASN

AS24940

Organization

Hetzner

Nameservers

ns2.limesurvey.org.ns1.limesurvey.org.

Performance

Page Speed

2.7 MB

54 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Joomla!

Technology Stack

11 Technologies Detected

Meta Frameworks

Remix Astro

Other

AOS (Animate On Scroll)Lottie

Libraries

UI Components

CSS Frameworks

Icon Libraries

Analytics

Tag Managers

Customer Support

SEO Analysis

B76/100

limesurvey.orglimesurvey.org

LimeSurvey — Free Online Survey Tool

Survey Maker — LimeSurvey is an online survey tool to quickly create questionnaires, poll votes & surveys. ✦ Free ✦ Easy ✦ Open Source ➜ Start your survey now!

Title Length36 chars

Recommended: 50-60 chars

Description Length159 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

37 rules

Sitemap reference found

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

36d

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/2

Valid From

25.12.2025

Valid Until

25.03.2026

Subject Alternative Names (2)

*.limesurvey.orglimesurvey.org

SHA-256 Fingerprint

A8:70:09:97:18:15:6C:3D:78:5F:42:20:98:BD:3B:35:D1:15:C9:94...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-headers

DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Cont...

access-control-allow-methods

GET, POST, OPTIONS

access-control-allow-origin

access-control-expose-headers

Content-Length,Content-Range

content-encoding

📦 Gzip(gzip)

content-security-policy

connect-src 'self' *.zohopublic.eu *.googleadservices.com go...

Good Warning Issue

Email Infrastructure

Zoho Mail

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (3)

mx2.zoho.eu

mx3.zoho.eu

mx.zoho.eu

Domain Information

limesurvey.org

Domain Age

19y 5m

Created

10.09.2006

Expires

10.09.2029

Last Updated

25.06.2025

Registrar

Domain.com - Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Legitimate interest basis mentioned

Typography & Readability

IBM Plex Serif + IBM Plex Sans

51/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

18/25

3.73x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

IBM Plex Serif

Serif56px

Body Font

IBM Plex Sans

Sans15px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

56px

32px

18px

24px

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 3.7x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

✅ 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

4 Tools Detected

Enterprise

CRM Systems

Zoho CRMMid-Market

Customer Relationship Management platforms

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(9)consent.cookiebot.com(2)salesiq.zohopublic.eu(1)gtm.limesurvey.org(1)

Website Identity

Facebook LinkedIn GitHub Discord

Sponsored

Last analyzed: 17 Feb 2026 at 04:35

Historical Analysis & Change Tracking