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

readme.io

https://readme.io· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

readme.io

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.16.241.118

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

jeremy.ns.cloudflare.com.uma.ns.cloudflare.com.

Performance

Page Speed

1.4 MB

154 requests

Image Optimization

Lazy LoadResponsiveVercel Image Optimization

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

CMS

HubSpot CMS

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

13 Technologies Detected

Analytics

Customer Support

Meta Frameworks

CSS Frameworks

Icon Libraries

Tag Managers

Marketing

Advertising

CDN

SEO Analysis

B76/100

readme.ioreadme.io

ReadMe

Make your APIs easy to use with clear, powerful API documentation built for developer success.

Title Length6 chars

Recommended: 50-60 chars

Description Length94 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,077 URLs

robots.txt

1 rules

Allows all crawlers

Sponsored

Security Score

71%Good

Interactive

HTTPS

WAF

72d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

31.01.2026

Valid Until

01.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

readme.com

SHA-256 Fingerprint

C5:AB:5D:36:D5:ED:20:3D:4C:8E:65:04:B8:AD:F9:08:AC:E9:E2:46...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cf-cache-status

DYNAMIC

cf-ray🇩🇪 Frankfurt

9cfc6516ff8cd38e-FRA

content-encoding

⚡ Brotli(br)

content-security-policy

frame-ancestors 'self' https://docs.readme.com

content-type

text/html; charset=utf-8

date

Wed, 18 Feb 2026 09:11:04 GMT

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

aspmx.l.google.com

alt4.aspmx.l.google.com

alt2.aspmx.l.google.com

alt1.aspmx.l.google.com

+1 more

Domain Information

readme.io

Domain Age

14y 9m

Created

17.05.2011

Expires

17.05.2026

Last Updated

27.11.2025

Registrar

1API GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

Marfa + system-ui

61/100

Readability

/30

10/40

10px · LH --

Hierarchy

/20

21/25

7.69x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Marfa

Sans80px

Body Font

system-ui

Sans10px

Contrast Ratio

Reading Comfort

~48 CPL

Optimal (45–75)

80px

64px

10px

❌ Critical: 10px body text is too small. Increase to at least 14px.

✅ Strong hierarchy: Headlines are 7.7x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

✅ Protected text on images: Using gradient for readability.

✅ Optimal line length: ~48 characters per line is comfortable to read.

⚠️ Cramped layout: 20 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

9 Tools Detected

Enterprise

CRM Systems

HubSpotMid-Market

Customer Relationship Management platforms

Customer Support

IntercomMid-Market

DriftMid-Market

Live chat and helpdesk tools

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

LinkedIn AdsEnterprise

AdRollMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

28 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)connect.facebook.net(2)googletagmanager.com(2)s.adroll.com(1)js.driftt.com(1)

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Last analyzed: 18 Feb 2026 at 09:11

Historical Analysis & Change Tracking