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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openresty.com

https://openresty.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

openresty.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.74.86.167

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS16509

Organization

AWS EC2 (eu-central-1)

Server

OpenResty

Nameservers

n2.openresty.com.n1.openresty.com.

Performance

Page Speed

1.4 MB

54 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

CMS

Medium

Infrastructure

Hosting

Amazon Web Services (AWS)

Technology Stack

9 Technologies Detected

Libraries

CSS Frameworks

Analytics

UI Components

Advertising

Web Servers

SEO Analysis

D41/100

openresty.comopenresty.com

OpenResty - Enterprise solutions

OpenResty Inc. develops and offers software products to empower enterprises with machine coding technologies.

Title Length32 chars

Recommended: 50-60 chars

Description Length109 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (26/26)

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

10 URLs

robots.txt

6 rules

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

64d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

ZeroSSL

Key Algorithm

RSA (2048 bit)

Signature

SHA-384 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

22.01.2026

Valid Until

22.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (3)

openresty.comeu.openresty.comwww.openresty.com

SHA-256 Fingerprint

F4:7B:36:AD:A8:80:E5:CB:46:31:5C:A3:ED:BC:4D:8E:CB:5A:88:2B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=3600, h3-25=":443"; ma=3600, h3-29=":443"; ma=...

cache-control

🟡 1 Hours(max-age=3600, no-transform)

cache-status

HIT

content-encoding

zstd

content-security-policy

default-src 'self' https://ngx2edge.openresty.com https://bl...

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

aspmx3.googlemail.com

alt1.aspmx.l.google.com

aspmx.l.google.com

aspmx2.googlemail.com

+1 more

Domain Information

openresty.com

Domain Age

17y 10m

Created

24.04.2008

Expires

24.04.2026

Last Updated

09.04.2025

Registrar

Squarespace Domains II LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Roboto Regular + Helvetica Neue

83/100

Readability

/30

40/40

24px · LH 1.40

Hierarchy

/20

25/25

2.67x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Roboto Regular

Sans64px

Body Font

Helvetica Neue

Sans24px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

64px

36px

24px

✅ Excellent readability: 24px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.7x larger than body text.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

⚠️ Cramped layout: 8 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Advertising

LinkedIn AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

static.openresty.com(4)googletagmanager.com(2)snap.licdn.com(1)ws.zoominfo.com(1)local(1)

Website Identity

X (Twitter)LinkedIn YouTube GitHub Medium

Sponsored

Last analyzed: 17 Feb 2026 at 05:27

Historical Analysis & Change Tracking