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

curbed.com

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

Export

curbed.com

Mobile

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.193.91

Server Location

🇨🇦 Montreal, Canada

ASN

AS54113

Organization

Fastly, Inc.

CDN

Fastly

Nameservers

ns-199.awsdns-24.com.ns-812.awsdns-37.net.ns-1360.awsdns-42.org.ns-1818.awsdns-35.co.uk.

Performance

Page Speed

377 KB

66 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

BigCommerce

Technology Stack

9 Technologies Detected

Advertising

Google Ads Google AdSense Snapchat Pixel

Analytics

CSS Frameworks

Tag Managers

Customer Support

Payments

SEO Analysis

B72/100

curbed.comcurbed.com

Curbed | A site for city people

Curbed is all things home, from interior design and architecture to home tech, renovations, tiny houses, prefab, and real estate.

Title Length31 chars

Recommended: 50-60 chars

Description Length129 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (31/32)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

47 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

77d

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+H3

Valid From

31.01.2026

Valid Until

01.05.2026

Subject Alternative Names (1)

*.curbed.com

SHA-256 Fingerprint

C7:1A:E4:74:B1:9B:33:97:29:2B:D6:93:78:62:38:A8:65:A9:17:41...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

290

alt-svc

h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=864...

content-encoding

⚡ Brotli(br)

content-length

228054

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)

alt4.aspmx.l.google.com

alt1.aspmx.l.google.com

aspmx.l.google.com

alt2.aspmx.l.google.com

+1 more

Domain Information

curbed.com

Domain Age

23y 10m

Created

10.04.2002

Expires

10.04.2026

Last Updated

06.03.2025

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

Antique No 6 + Times New Roman

61/100

Readability

/30

30/40

16px · LH --

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Antique No 6

Sans

Body Font

Times New Roman

Serif16px

Contrast Ratio

Reading Comfort

Sans Headlines + Serif Body

left aligned

27px

45px

Major Sixth

Scale

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

✅ Good performance: Using 2 font families keeps load times fast.

⚠️ Cramped layout: 10 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

6 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Microsoft ClarityFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

16 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagservices.com(2)pagead2.googlesyndication.com(2)sb.scorecardresearch.com(1)googletagmanager.com(1)public.profitwell.com(1)

Website Identity

curbed.com

23 years old

Amazon Registrar, Inc.📧 Google Workspace

Sponsored

Last analyzed: 13 Feb 2026 at 03:48

Historical Analysis & Change Tracking