falstad.com

https://falstad.com· First analyzed 28 Apr 2026· Updated 28 Apr 2026

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falstad.com

Mobile

Sponsored

Hosting Provider

Host 80 LLC

IP Address

45.43.3.15

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Dallas, United States

ASN

AS397423

Organization

Host 80 LLC

Server

Nginx

Nameservers

ns1.myplesk.cc.ns2.myplesk.cc.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

265 ms10%

Speed Index

344 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

106 KB

6 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Host 80 LLC

Technology Stack

1 Technologies Detected

Web Servers

Nginx

SEO Analysis

F31/100

Meta Tags4/15

Content3/12

Headings0/8

Technical6/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

falstad.comfalstad.com

Paul Falstad

No description available for this page.

Title Length12 chars

Recommended: 50-60 chars (~70px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (5)

• Missing meta description — important for click-through rates in SERPs
• Very thin content (16 words). Search engines need substantial content for ranking.
• Missing H1 tag — every page should have exactly one H1

14 issues found

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Crawlability

Sitemap

robots.txt

4 rules

Local SEO

Local Search Readiness

0/100

Poor

15 2

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

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AI & LLM Readiness

F22/100

Bot Access

20/25

Machine Read.

1/25

Schema Data

0/25

Citation

1/25

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:8%

Words:14

Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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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.

48/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

3/20

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

9/15

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

ARIA & Roles

1/15

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

4 recommendations

•Accessibility recommendation preview...

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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.

60/100

A+

13 mg

CO₂e / view

106.4 KB

Page Weight

95%

Cleaner Than

New Visitor

15 mg

Returning (cached)

8 mg

Annual (10K/mo)

1.6 kg

Emission Segments

Data Center

3 mg

Network

3 mg

Device

7 mg

Resource Breakdown

Images

105.6 KB

HTML

740 B

Green Hosting Not Verified

Host 80 LLC

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

No SSL

No WAF

N/A

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HTTP Headers

Developer Console

content-encoding

⚡ Brotli(br)

content-type

text/html

date

Tue, 28 Apr 2026 22:36:24 GMT

etag

W/"67746495-485"

last-modified

Tue, 31 Dec 2024 21:39:33 GMT

server

nginx

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mail.falstad.com

Domain Information

falstad.com

Domain Age

27 years

Created

27.04.1999

Expires

27.04.2028

Last Updated

14.01.2023

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

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.

30/100

Not 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.

4 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Times New Roman

WCAG Fail

60/100

Readability

/30

21/30

16px · LH --

Hierarchy

/20

10/20

WCAG

/25

15/25

1.06:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

1.06:1

8 issues

Reading Comfort

Single Family

left aligned

16px

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

❌ Low contrast: 8 elements fail WCAG AA (min 1.1:1). Increase text/background contrast.

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

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

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Color Palette

6 unique colors

2.16:1 Fail Dark

#505050

Other· 95.49999999999997%

#1a1a17

Text· 0.5%

#929d7c

Primary· 1.3%

#e0debc

Secondary· 0.8%

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Website Identity

falstad.com

27 years old

Location detected: 🇺🇸 United Statesvia ip

Network Solutions, LLC

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Last analyzed: 28 Apr 2026 at 22:36

Historical Analysis & Change Tracking