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aapt.org

https://aapt.org· First analyzed 30 Apr 2026· Updated 30 Apr 2026
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aapt.org
Desktop screenshot of aapt.org
Mobile screenshot of aapt.org
Mobile

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Hosting Provider

Amazon Web Services (AWS)
aws.amazon.com

IP Address

3.137.67.5

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Dublin, United States

ASN

AS16509

Organization

AWS EC2 (us-east-2)

Server

Microsoft IIS

Nameservers

ns-1717.awsdns-22.co.uk.ns-352.awsdns-44.com.ns-908.awsdns-49.net.ns-1110.awsdns-10.org.

Performance

90

Core Web Vitals

Weight

First Contentful Paint
1.5 s10%
Speed Index
1.9 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
26.4 MB
81 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
Amazon Web Services (AWS)

Technology Stack

13 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
Segment

Libraries

2
jQueryv1.12
jQuery UI

UI Components

2
Slick CarouselLightbox

CSS Frameworks

2
Bootstrapv4.0.0
Tailwind CSS

Icon Libraries

1
Font Awesome

Fonts

1
Google Fonts

Web Servers

1
Microsoft IISv10.0

Frameworks

1
ASP.NET

SEO Analysis

D59/100
16
9
1
Meta Tags10/15
Content11/12
Headings8/8
Technical14/25
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile2/4
Indexability3/3
A
aapt.orgaapt.org

AAPT - American Association of Physics Teachers

AAPT - American Association of Physics Teachers

Title Length47 chars

Recommended: 50-60 chars (~285px / 580px)

Description Length47 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (15/18) — critical for accessibility and SEO

10 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1 URLs

robots.txt

4 rules

Local SEO

Local Search Readiness

11/100
Poor
4 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

D41/100
Bot Access
20/25
Machine Read.
13/25
Schema Data
0/25
Citation
8/25

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
Text ratio:10%
Words:1,383
Token eff.:Optimal
Sections/1K:14.5

Structured Data

No Schema

Citation Readiness

Opening Summary19w
Descriptive Headingsavg 3.6w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
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.
B
78/100
16
Passed
1
Critical
1
Warnings
Images & Alt Text
5/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
20/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
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
13/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
10/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •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.
22/100
F
2.73 g
CO₂e / view
26.4 MB
Page Weight
5%
Cleaner Than
New Visitor
3.12 g
vs
Returning (cached)
1.56 g
Annual (10K/mo)
328.1 kg
Emission Segments
Data Center
134 mg
Network
803 mg
Device
1.80 g
Resource Breakdown
JavaScript
678.8 KB
Images
448.2 KB
CSS
25.3 MB
Fonts
2.1 KB
HTML
55.0 KB
Green Hosting Verified
Amazon Web Services (AWS)
Provider Match
7 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
D

Security Score

51%Poor
Interactive

HTTPS

No WAF

145d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

27.10.2025

Valid Until

22.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.aapt.orgaapt.org

SHA-256 Fingerprint

59:EC:78:30:DF:F9:78:02:60:72:2A:C5:F8:B0:AF:8B:E9:1F:8D:83...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

cache-control
🔴 No Cache(no-store)
content-security-policy
frame-ancestors 'self'
content-type
text/html;charset=UTF-8
date
Thu, 30 Apr 2026 18:00:47 GMT
expires
Mon, 06 Jan 1990 00:00:01 GMT
pragma
no-cache
Good Warning Issue

Email Infrastructure

Google Workspace

Score

93

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

aspmx3.googlemail.com
aspmx2.googlemail.com
alt2.aspmx.l.google.com
aspmx.l.google.com

+1 more

Domain Information

aapt.org

Domain Age
32y 8m

Created

12.08.1993

Expires

11.08.2030

Last Updated

10.06.2021

Registrar

Tucows Domains Inc.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

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.
D
58/100
Mobile Friendly1 breakpoint
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, shrink-to-fit=no
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Open Sans

WCAG Partial
72/100
Readability
/30
25/30

23px · LH 1.60

Hierarchy
/20
16/20

1.91x ratio · ✓ H1→H6

WCAG
/25
16/25

3.16:1 min contrast

Performance
/25
15/25

1 font · 1 req

Heading Font

Open Sans

Sans44px

Body Font

Open Sans

Sans23px

Contrast Ratio

3.16:1

18 issues

Reading Comfort

~35 CPL

Narrow lines
44px
h1
48px
h2
40px
h3
23px
p

✅ Excellent readability: 23px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 26/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 18 elements below WCAG AA threshold (min 3.2:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Lean font stack: 1 font families keeps load times fast.

GGoogle FontsFlesch 26

Color Palette

13 unique colors
19.4:1 AAA Light
#ffffff
Background· 18.3%
#0e0d0e
Text· 7.9%
#0a4c89
Primary· 12.3%
#544744
Text· 8.5%
#2c2539
Secondary· 7%
#86776e
Secondary· 6.3%
#436f95
Secondary· 4.7%
#13173e
Accent· 3.6%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

30 Resources

20
Scripts
10
Styles
2
Async
0
Defer

Top Script Sources

local(15)google-analytics.com(1)code.jquery.com(1)googletagmanager.com(1)maxcdn.bootstrapcdn.com(1)

Website Identity

aapt.org

32 years old
Location detected: 🇺🇸 United Statesvia ip
Tucows Domains Inc.📧 Google Workspaceen

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Last analyzed: 30 Apr 2026 at 18:01

Historical Analysis & Change Tracking