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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caddyserver.com

https://caddyserver.com· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

caddyserver.com

Mobile

Sponsored

Hosting Provider

DigitalOcean

digitalocean.com

IP Address

165.227.20.207

Server Location

🇺🇸 Santa Clara, United States

ASN

AS14061

Organization

DigitalOcean, LLC

Server

Caddy

CDN

Cloudflare

WAF

Cloudflare

Nameservers

pearl.ns.cloudflare.com.pranab.ns.cloudflare.com.

Performance

Page Speed

2.1 MB

110 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Framer

Technology Stack

8 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Fonts

Payments

Web Servers

SEO Analysis

D58/100

caddyserver.comcaddyserver.com

Caddy - The Ultimate Server with Automatic HTTPS

Caddy is a powerful, enterprise-ready, open source web server with automatic HTTPS written in Go

Title Length48 chars

Recommended: 50-60 chars

Description Length96 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (74/108)

5 issues found

Upgrade to view details

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

31d

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+H3

Valid From

16.12.2025

Valid Until

16.03.2026

Subject Alternative Names (1)

caddyserver.com

SHA-256 Fingerprint

EC:E9:41:0C:4A:72:09:84:68:F0:0D:65:2C:8E:C8:51:4E:E7:AF:0C...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=2592000

content-encoding

zstd

content-type

text/html; charset=utf-8

date

Fri, 13 Feb 2026 17:21:09 GMT

server

Caddy

vary

Accept-Encoding

Good Warning Issue

Email Infrastructure

Zoho Mail

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (3)

mx2.zoho.com

mx3.zoho.com

mx.zoho.com

Domain Information

caddyserver.com

Domain Age

10y 10m

Created

25.03.2015

Expires

25.03.2026

Last Updated

26.03.2025

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

ui-rounded + Inter

88/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

7.41x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

ui-rounded

Sans120px

Body Font

Inter

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

120px

52px

18px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 7.4x 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.

✅ Protected text on images: Using gradient for readability.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

FathomSMB

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

14 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)googletagmanager.com(1)cdn.usefathom.com(1)cdn.jsdelivr.net(1)

Website Identity

X (Twitter)GitHub Reddit

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Last analyzed: 13 Feb 2026 at 17:21

Historical Analysis & Change Tracking