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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noteflight.com

https://noteflight.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

noteflight.com

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

54.157.41.83

Server Location

🇺🇸 Ashburn, United States

ASN

AS14618

Organization

AWS EC2 (us-east-1)

Server

Nginx

Nameservers

ns-1391.awsdns-45.org.ns-1679.awsdns-17.co.uk.ns-466.awsdns-58.com.ns-536.awsdns-03.net.

Performance

Page Speed

11 KB

37 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

10 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Segment

CSS Frameworks

Tailwind CSS

Tag Managers

Google Tag Manager

Advertising

Microsoft Advertising

Other

Instapage

Web Servers

Nginxv1.26.3

Security

reCAPTCHA

SEO Analysis

A84/100

noteflight.comnoteflight.com

Noteflight - Online Music Notation Software

Noteflight is an online music writing application that lets you create, view, print and hear professional quality music notation right in your web browser.

Title Length43 chars

Recommended: 50-60 chars

Description Length155 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (43/44)

1 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

32 rules

Sitemap reference found

Sponsored

Security Score

61%Fair

Interactive

HTTPS

No WAF

387d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

12.02.2026

Valid Until

12.03.2027

OCSP Stapling

Enabled

Subject Alternative Names (12)

*.noteflight.com*.sites.noteflight.com*.charms.noteflight.comnoteflight.com*.berkleemusic.noteflight.com*.vhs.noteflight.com*.learning.noteflight.com*.gc.noteflight.com+4 more

SHA-256 Fingerprint

FD:D9:C3:6B:7F:29:F9:E4:D4:9A:FF:BD:8D:B3:DB:15:E0:56:89:28...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

date

Wed, 18 Feb 2026 05:57:45 GMT

content-type

text/html; charset=utf-8

server

nginx/1.26.3

x-frame-options

SAMEORIGIN

x-xss-protection

x-content-type-options

nosniff

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

alt2.aspmx.l.google.com

aspmx.l.google.com

alt1.aspmx.l.google.com

Domain Information

noteflight.com

Domain Age

18y 1m

Created

03.01.2008

Expires

03.01.2027

Last Updated

12.12.2025

Registrar

Name106, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Data Protection Officer mentioned

Typography & Readability

Helvetica Neue

31/100

Readability

/30

10/40

13px · LH --

Hierarchy

/20

18/25

6.46x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Helvetica Neue

Sans84px

Body Font

Helvetica Neue

Sans13px

Contrast Ratio

Reading Comfort

~54 CPL

Optimal (45–75)

84px

72px

48px

20px

13px

❌ Critical: 13px body text is too small. Increase to at least 14px.

✅ Strong hierarchy: Headlines are 6.5x 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.

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

⚠️ Risky: Text appears on background images without overlay protection.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

g.fastcdn.co(6)googletagmanager.com(3)google-analytics.com(2)connect.facebook.net(2)cdn.transifex.com(2)

Website Identity

Facebook X (Twitter)Instagram

Sponsored

Last analyzed: 18 Feb 2026 at 05:58

Historical Analysis & Change Tracking