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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undrtone.com

https://undrtone.com· First analyzed 25 Apr 2026· Updated 25 Apr 2026

Export

undrtone.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

52.73.238.212

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Ashburn, United States

ASN

AS14618

Organization

AWS EC2 (us-east-1)

Nameservers

ns-104.awsdns-13.com.ns-1134.awsdns-13.org.ns-1607.awsdns-08.co.uk.ns-924.awsdns-51.net.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.3 s10%

Speed Index

1.7 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

2.3 MB

41 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Ghost

Technology Stack

6 Technologies Detected

Analytics

Other

CSS Frameworks

Frameworks

SEO Analysis

D58/100

Meta Tags14/15

Content9/12

Headings5/8

Technical10/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social2/5

Freshness0/4

Mobile4/4

Indexability3/3

undrtone.comundrtone.com

Undrtone - share and discover music you love

Hooking into Spotify, SoundCloud, Deezer and Apple Music, Undrtone uses the world's biggest cloud-based services to create a community around music.

Title Length44 chars

Recommended: 50-60 chars (~269px / 580px)

Description Length148 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (61/61) — critical for accessibility and SEO

11 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

2 rules

Allows all crawlers

Local SEO

Local Search Readiness

6/100

Poor

2 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F37/100

Bot Access

20/25

Machine Read.

11/25

Schema Data

0/25

Citation

6/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

nav

Text ratio:2%

Words:707

Token eff.:Optimal

Sections/1K:2.8

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary12w

Descriptive Headingsavg 2.7w

Canonical URL

Open Graph2/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

46/100

Passed

Critical

Warnings

Images & Alt Text

5/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

14/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

3/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

0/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

5 recommendations

•Accessibility recommendation preview...

Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

45/100

241 mg

CO₂e / view

2.3 MB

Page Weight

30%

Cleaner Than

New Visitor

275 mg

Returning (cached)

138 mg

Annual (10K/mo)

28.9 kg

Emission Segments

Data Center

12 mg

Network

71 mg

Device

158 mg

Resource Breakdown

JavaScript

80.3 KB

Images

2.2 MB

HTML

32.5 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

5 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

230d

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

12.11.2025

Valid Until

11.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (4)

undrtone.comundr.tn*.undrtone.com*.undr.tn

SHA-256 Fingerprint

14:5B:63:28:69:81:DE:63:E3:00:B9:BC:8A:EB:27:4C:15:58:00:53...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Sat, 25 Apr 2026 15:43:01 GMT

etag

W/"2d044-2vPBHPxQ28phlczU6ryeNw"

vary

Accept-Encoding

x-csrf-token

7614QMLO-vxWxQKFW-HgUK40edV7M4BTNZRY

Good Warning Issue

Email Infrastructure

ImprovMX

Score

SPF

DKIM

DMARC

MX Records (2)

mx2.improvmx.com

mx1.improvmx.com

Domain Information

undrtone.com

Domain Age

11y 9m

Created

14.07.2014

Expires

14.07.2026

Last Updated

09.06.2025

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

50/100

Mobile Friendly

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1

4 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

AvenirLT-Heavy

WCAG Partial

51/100

Readability

/30

13/30

14px · LH 1.20

Hierarchy

/20

8/20

1.14x ratio

WCAG

/25

17/25

1:1 min contrast

Performance

/25

13/25

2 fonts · 3 req

Heading Font

AvenirLT-Heavy

Sans16px

Body Font

AvenirLT-Heavy

Sans14px

Contrast Ratio

1:1

30 issues

Reading Comfort

~31 CPL

Narrow lines

16px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Tight line spacing (1.20). Increase to 1.4–1.6 for better readability.

⚠️ Hard to read: Flesch score 34/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 30 elements below WCAG AA threshold (min 1.0:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

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

Buy on MyFontsFlesch 34

Color Palette

12 unique colors

18.87:1 AAA Dark

#111112

Text· 26.1%

#ffffff

Text· 7.1%

#eeede1

Primary· 12.6%

#56616b

Secondary· 7.5%

#b37e68

Secondary· 7.2%

#80382e

Secondary· 5.7%

#5d9cad

Secondary· 4.6%

#262c2f

Secondary· 3.9%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

MixpanelMid-Market

User behavior and product analytics

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

12 Resources

Scripts

Styles

Async

Defer

Top Script Sources

google-analytics.com(2)cdn.mxpnl.com(1)hello.myfonts.net(1)gstatic.com(1)google.com(1)

Website Identity

undrtone.com

hello@undrtone.com

11 years old

Location detected: 🇺🇸 United Statesvia ip

Amazon Registrar, Inc.📧 ImprovMX

Social Profiles

Facebook X (Twitter)Instagram

Sponsored

Last analyzed: 25 Apr 2026 at 15:43

Historical Analysis & Change Tracking