alexsteffen.com

https://alexsteffen.com· First analyzed 04 Jun 2026· Updated 04 Jun 2026

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alexsteffen.com

Mobile

Sponsored

Hosting Provider

Enflow B.V

IP Address

89.106.200.1

Site Location

🇳🇱 Netherlandsvia ip

Server Location

🇳🇱 Alphen aan den Rijn, The Netherlands

ASN

AS209626

Organization

Enflow B.V

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns11.nationbuilder.com.ns15.nationbuilder.com.ns14.nationbuilder.com.ns13.nationbuilder.com.+2 more

Performance

100

Core Web Vitals

Weight

First Contentful Paint

304 ms10%

Speed Index

395 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

8 KB

30 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Substack

Technology Stack

7 Technologies Detected

Analytics

Libraries

Other

CSS Frameworks

Fonts

CDN

SEO Analysis

B72/100

Meta Tags9/15

Content9/12

Headings5/8

Technical21/25

E-E-A-T7/7

Images1/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile4/4

Indexability3/3

alexsteffen.comalexsteffen.com

Alex Steffen's Climate Foresight Courses, Writing and Podcasts

No description available for this page.

Title Length62 chars

Recommended: 50-60 chars (~372px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Most images missing alt text (6/7) — critical for accessibility and SEO

6 issues found

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Crawlability

Sitemap

Type: index

2 URLs

2 sub-sitemaps

robots.txt

7 rules

Sitemap reference found

Local SEO

Local Search Readiness

12/100

Poor

3 14

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

Sponsored

AI & LLM Readiness

D48/100

Bot Access

20/25

Machine Read.

9/25

Schema Data

6/25

Citation

13/25

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

navheader/footer

Text ratio:7%

Words:329

Token eff.:Optimal

Sections/1K:3

Depth:2/5

Structured Data

6 JSON-LD

Person×1.3Organization×1.1

sameAs entity links

Citation Readiness

Opening Summary14w

Descriptive Headingsavg 6w

Canonical URL

Open Graph2/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

AI readiness recommendation preview...

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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.

61/100

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

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

3/15

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

3 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.

57/100

A+

<0.001 g

CO₂e / view

7.7 KB

Page Weight

95%

Cleaner Than

New Visitor

1 mg

Returning (cached)

<0.001 g

Annual (10K/mo)

108 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

<0.001 g

Resource Breakdown

HTML

7.7 KB

Green Hosting Not Verified

Enflow B.V

4 recommendations

•Carbon footprint recommendation preview...

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A+

Security Score

96%Excellent

Static / Informational

HTTPS

WAF

45d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

20.04.2026

Valid Until

19.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.alexsteffen.com

SHA-256 Fingerprint

3C:FD:49:CB:B5:3A:58:09:72:45:F5:A7:E1:FD:F1:9E:65:F3:CA:FB...

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HTTP Headers

Developer Console

access-control-request-method

GET, POST, PUT, DELETE

age

alt-svc

h3=":443"; ma=86400

cache-control

🔴 No Cache(no-cache, no-store, max-age=0, must-revalidate)

cf-cache-status

DYNAMIC

cf-ray🇺🇸 Washington DC

a0641ee4c8c77075-IAD

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt1.aspmx.l.google.com

alt3.aspmx.l.google.com

alt4.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

alexsteffen.com

Domain Age

15y 6m

Created

10.11.2010

Expires

10.11.2028

Last Updated

27.08.2025

Registrar

Gandi SAS

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.

56/100

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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Helvetica + Helvetica Neue

WCAG Partial

64/100

Readability

/30

25/30

18px · LH 1.70

Hierarchy

/20

13/20

2.33x ratio

WCAG

/25

15/25

1:1 min contrast

Performance

/25

11/25

System fonts

Heading Font

Helvetica

Sans42px

Body Font

Helvetica Neue

Sans18px

Contrast Ratio

1:1

5 issues

Reading Comfort

~34 CPL

Narrow lines

42px

27px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

⚠️ Partial contrast: 5 elements below WCAG AA threshold (min 1.0:1).

❌ Broken heading hierarchy: 2 level skip(s). Screen readers rely on sequential headings (h1→h2→h3).

✅ Strong hierarchy: Headlines are 2.3x larger than body text.

✅ System fonts: Zero font loading delay — best possible LCP impact.

GGoogle Fonts Buy on MyFontsFlesch 55

Color Palette

8 unique colors

5.1:1 AA Light

#ffffff

Background· 87.29999999999998%

#6c6e73

Other· 1.7%

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

alexsteffen.nationbuilder.com(7)connect.facebook.net(2)platform.twitter.com(2)assets.nationbuilder.com(2)ssl.google-analytics.com(1)

Website Identity

Alex Steffen

Person

Alex Steffen is a leading climate futurist and advisor known for his pioneering work on climate foresight, ruggedization, and personal climate strategies

www.alexsteffen.com

15 years old

Location detected: 🇳🇱 Netherlandsvia ip

Gandi SAS📧 Google Workspace

Social Profiles

Facebook X (Twitter)

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Last analyzed: 04 Jun 2026 at 04:17

Historical Analysis & Change Tracking