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

aceee.org

https://aceee.org· First analyzed 25 Apr 2026· Updated 25 Apr 2026

Export

aceee.org

Mobile

Sponsored

Hosting Provider

Pantheon

pantheon.io

IP Address

23.185.0.3

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

Pantheon

Server

Nginx

CDN

Fastly

Nameservers

ns4.worldnic.com.ns3.worldnic.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

298 ms10%

Speed Index

387 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3.6 MB

95 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

11 Technologies Detected

Analytics

CSS Frameworks

Payments

Other

Tag Managers

Email Marketing

Web Servers

SEO Analysis

B73/100

Meta Tags15/15

Content10/12

Headings5/8

Technical19/25

E-E-A-T0/7

Images3/7

Links5/5

URL5/5

Social3/5

Freshness2/4

Mobile3/4

Indexability3/3

aceee.orgaceee.org

ACEEE | American Council for an Energy-Efficient Economy

ACEEE believes in leveraging energy efficiency to enhance economic prosperity, energy security, and environmental protection for all Americans.

Title Length56 chars

Recommended: 50-60 chars (~339px / 580px)

Description Length143 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (24/29) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

3,078 URLs

robots.txt

53 rules

Local SEO

Local Search Readiness

11/100

Poor

3 12 2

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

Sponsored

AI & LLM Readiness

D42/100

Bot Access

20/25

Machine Read.

8/25

Schema Data

0/25

Citation

14/25

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:3%

Words:1,115

Token eff.:Optimal

Sections/1K:1.8

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary210w

Descriptive Headingsavg 2.8w

Canonical URL

Open Graph3/3

Twitter Card1/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

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.

57/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

Semantic Structure

15/20

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

Forms & Inputs

2/15

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

Color & Contrast

14/15

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

7/15

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

4 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.

27/100

450 mg

CO₂e / view

3.6 MB

Page Weight

15%

Cleaner Than

New Visitor

514 mg

Returning (cached)

257 mg

Annual (10K/mo)

54.0 kg

Emission Segments

Data Center

101 mg

Network

108 mg

Device

242 mg

Resource Breakdown

JavaScript

487.1 KB

Images

2.3 MB

CSS

723.8 KB

HTML

21.1 KB

Other

61.9 KB

Green Hosting Not Verified

Pantheon

6 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

15%Critical

Critical / Transactional

HTTPS

No WAF

35d

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

01.03.2026

Valid Until

30.05.2026

Subject Alternative Names (2)

aceee.orgwww.aceee.org

SHA-256 Fingerprint

35:2B:1E:D3:CF:1A:E3:A5:1D:63:91:B8:81:58:5D:1E:CF:93:56:30...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

2638

cache-control

🟡 1 Hours(max-age=3600, public)

content-encoding

📦 Gzip(gzip)

content-language

content-length

21265

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

aceee-org.mail.protection.outlook.com

Domain Information

aceee.org

Domain Age

28y 10m

Created

13.06.1997

Expires

12.06.2031

Last Updated

18.04.2026

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

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.

76/100

Mobile Friendly28 breakpoints

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=1.0

2 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Ubuntu + Open Sans

WCAG Partial

69/100

Readability

/30

23/30

16px · LH 1.50

Hierarchy

/20

16/20

3.5x ratio

WCAG

/25

14/25

1:1 min contrast

Performance

/25

16/25

2 fonts · 8 req

Heading Font

Ubuntu

Sans56px

Body Font

Open Sans

Sans16px

Contrast Ratio

1:1

4 issues

Reading Comfort

~39 CPL

Narrow lines

56px

35px

22px

16px

Minor Second

Scale

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

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 6/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 4 elements below WCAG AA threshold (min 1.0:1).

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

✅ Strong hierarchy: Headlines are 3.5x larger than body text.

Buy on MyFontsFlesch 6

Color Palette

9 unique colors

2.77:1 Fail Dark

#6b7578

Other· 8.1%

#2e3132

Other· 7.8%

#39454c

Primary· 27.9%

#77b6d9

Accent· 21.099999999999998%

#897d6a

Secondary· 10.1%

#595248

Secondary· 9.1%

#755844

Secondary· 5.4%

#d8e4ea

Secondary· 4.6%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)googletagmanager.com(4)static.addtoany.com(3)connect.facebook.net(2)cdn.donately.com(2)

Website Identity

aceee.org

28 years old

Location detected: 🇺🇸 United Statesvia ip

Network Solutions, LLC📧 Microsoft 365en

Social Profiles

Facebook Instagram LinkedIn YouTube Threads Bluesky

Sponsored

Last analyzed: 25 Apr 2026 at 13:53

Historical Analysis & Change Tracking