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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calendly.com

https://calendly.com· First analyzed 10 Feb 2026· Updated 10 Feb 2026

Export

calendly.com

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.18.41.175

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

roan.ns.cloudflare.com.hope.ns.cloudflare.com.

Performance

Page Speed

55 KB

121 requests

0–49

50–89

90–100

Architecture Stack

JAMstack

🔀 Hybrid

Decoupled

Frontend

Framework

Next.js

API

Data Source

Headless CMS

Contentful

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Detected API Sources

//images.ctfassets.net/k0lk9ki...

Technology Stack

10 Technologies Detected

Analytics

Customer Support

Meta Frameworks

CSS Frameworks

Icon Libraries

Tag Managers

CDN

Marketing

SEO Analysis

A+94/100

calendly.comcalendly.com

Free Online Appointment Scheduling Software | Calendly

Calendly is the modern scheduling platform that makes “finding time” a breeze. When connecting is easy, your teams can get more done.

Title Length54 chars

Recommended: 50-60 chars

Description Length133 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Sponsored

Security Score

54%Poor

Interactive

HTTPS

WAF

88d

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache)

cf-cache-status

DYNAMIC

cf-ray🇩🇪 Frankfurt

9cbdfeeac8e12954-FRA

content-encoding

⚡ Brotli(br)

content-type

text/html

cross-origin-opener-policy

same-origin

Good Warning Issue

Typography & Readability

gilroy

80/100

Readability

/30

32/40

14px · LH 1.40

Hierarchy

/20

25/25

4.86x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

gilroy

Sans68px

Body Font

gilroy

Sans14px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

68px

18px

28px

18px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.9x larger than body text.

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

✅ Consistent design: Single font family with weight variations is a modern best practice.

⚠️ Cramped layout: 77 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Scheduling

CalendlySMB

Appointment and meeting schedulers

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

marketing-assets.calendly.com(13)ws.zoominfo.com(5)googletagmanager.com(1)snippet.maze.co(1)

Website Identity

calendly.com

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Last analyzed: 10 Feb 2026 at 19:26

Historical Analysis & Change Tracking