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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blockchain.info

https://blockchain.info· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

blockchain.info

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.16.117.55

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

jay.ns.cloudflare.com.beth.ns.cloudflare.com.

Performance

Page Speed

1.2 MB

120 requests

Image Optimization

Lazy LoadVercel Image Optimization

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Next.js

CMS

Medium

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

4 Technologies Detected

Meta Frameworks

Icon Libraries

Analytics

CDN

SEO Analysis

D52/100

blockchain.infoblockchain.info

Blockchain Explorer - Bitcoin Tracker & More | Blockchain.com

The most popular and trusted Bitcoin block explorer and crypto transaction search engine.

Title Length61 chars

Recommended: 50-60 chars

Description Length89 chars

Recommended: 120-160 chars

Issues (0)

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

114 URLs

robots.txt

18 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

WAF

251d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

25.09.2025

Valid Until

26.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (7)

www.blockchain.comblockchain.infows.blockchain.infoapi.blockchain.infologin.blockchain.comapi.blockchain.combps.blockchain.com

SHA-256 Fingerprint

A7:F0:DE:39:FB:63:5F:27:FB:24:96:48:D8:A2:1B:D4:1C:A9:CE:A6...

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 30s(public, max-age=30, stale-while-revalidate=60, must-revalida...)

cf-cache-status

MISS

cf-ray🇩🇪 Frankfurt

9cf7087d68bb1b48-FRA

content-encoding

⚡ Brotli(br)

content-language

content-security-policy

default-src 'self'; media-src 'self' https://anchor.fm https...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

aspmx2.googlemail.com

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

blockchain.info

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Inter var

66/100

Readability

/30

30/40

20px · LH --

Hierarchy

/20

15/25

0.79x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Inter var

Sans16px

Body Font

Inter var

Sans20px

Contrast Ratio

Reading Comfort

~43 CPL

Needs attention

16px

12px

16px

11px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

⚠️ 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.

⚠️ Cramped layout: 18 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(18)coinzillatag.com(1)ssl.google-analytics.com(1)

Website Identity

X (Twitter)Instagram Medium

Sponsored

Last analyzed: 17 Feb 2026 at 17:34

Historical Analysis & Change Tracking