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

kayak.com

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

Export

kayak.com

Mobile

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.1.29

Server Location

🇨🇦 Montreal, Canada

ASN

AS54113

Organization

Fastly, Inc.

Server

KAYAK/1.0

CDN

Fastly

Nameservers

blue.foundationdns.com.blue.foundationdns.net.blue.foundationdns.org.

Performance

Page Speed

577 KB

250 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Fastly, Inc.

CDN

Fastly

Technology Stack

9 Technologies Detected

Analytics

Meta Frameworks

Other

Other

CSS Frameworks

Tag Managers

Payments

SEO Analysis

A+94/100

kayak.comkayak.com

Etsi lentoja, hotelleja ja vuokra-autoja | KAYAK

KAYAK otsib korraga sadade reisisaitide seas, et leida sulle vajalik teave lendude, hotellide ja rendiautode osas õige otsuse tegemiseks.

Title Length48 chars

Recommended: 50-60 chars

Description Length137 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

112 URLs

robots.txt

1087 rules

Sitemap reference found

Sponsored

Security Score

71%Good

Interactive

HTTPS

No WAF

47d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

01.01.2026

Valid Until

01.04.2026

Subject Alternative Names (1)

www.fi.kayak.com

SHA-256 Fingerprint

4B:9B:41:28:EE:7B:B4:98:48:70:1C:EA:46:98:D8:8E:00:7F:34:A4...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-language

fi-FI

x-content-type-options

nosniff

x-sn-waf-code

referrer-policy

origin-when-cross-origin

x-r9-mst-req

003000018731941

server

KAYAK/1.0

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mxa-009e5101.gslb.pphosted.com

mxb-009e5101.gslb.pphosted.com

Domain Information

kayak.com

Domain Age

30y 10m

Created

13.04.1995

Expires

02.05.2027

Last Updated

31.01.2025

Registrar

101domain GRS Limited

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

-apple-system

58/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

8/25

1.43x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

-apple-system

Sans20px

Body Font

-apple-system

Sans14px

Contrast Ratio

Reading Comfort

~92 CPL

Needs attention

20px

44px

24px

14px

Major Second

Scale

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

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

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

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

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

Buy on MyFontsVariable Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagservices.com(1)accounts.google.com(1)local(1)

Website Identity

kayak.com

30 years old

101domain GRS Limited

Sponsored

Last analyzed: 13 Feb 2026 at 02:06

Historical Analysis & Change Tracking