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

hotelscombined.com

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

Export

hotelscombined.com

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

551 KB

250 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

React

Infrastructure

Hosting

Fastly, Inc.

CDN

Fastly

Technology Stack

10 Technologies Detected

Analytics

Frameworks

Meta Frameworks

Libraries

Other

CSS Frameworks

Tag Managers

Advertising

Payments

SEO Analysis

A88/100

hotelscombined.comhotelscombined.com

HotelsCombined | Find Deals on Travel Accommodations

Find the best deals on travel accommodations with HotelsCombined. Compare prices from the top travel sites with just one search, and find your ideal place to...

Description truncated.

Title Length52 chars

Recommended: 50-60 chars

Description Length163 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

32 URLs

robots.txt

1133 rules

Sitemap reference found

Sponsored

Security Score

61%Fair

Interactive

HTTPS

No WAF

43d

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.hotelscombined.com

SHA-256 Fingerprint

35:E6:5D:D4:A9:15:E0:06:6A:3C:C0:5F:50:D1:6E:23:6E:27:C0:A8...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔴 No Cache(private, no-store)

content-encoding

⚡ Brotli(br)

content-language

en-US

content-security-policy

upgrade-insecure-requests; frame-ancestors 'self'

content-security-policy-report-only

default-src https: blob:; connect-src https:; font-src https...

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

hotelscombined.com

Domain Age

20y 3m

Created

28.10.2005

Expires

28.10.2026

Last Updated

21.01.2025

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

HelveticaNeue-Bold + HelveticaNeue

78/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

HelveticaNeue-Bold

Sans32px

Body Font

HelveticaNeue

Sans16px

Contrast Ratio

Reading Comfort

~88 CPL

Needs attention

32px

44px

24px

16px

Minor Second

Scale

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

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

✅ Protected text on images: Using gradient for readability.

⚠️ Wide lines: ~88 chars/line. Consider max-width for better reading flow.

Buy on MyFontsVariable Fonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

16 Resources

Scripts

Styles

Async

Defer

Top Script Sources

fundingchoicesmessages.google.com(2)securepubads.g.doubleclick.net(1)googletagservices.com(1)accounts.google.com(1)local(1)

Website Identity

Facebook X (Twitter)Instagram

Sponsored

Last analyzed: 17 Feb 2026 at 18:49

Historical Analysis & Change Tracking