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lisp.org

https://lisp.org· First analyzed 14 May 2026· Updated 14 May 2026
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lisp.org
Desktop screenshot of lisp.org
Mobile screenshot of lisp.org
Mobile

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Hosting Provider

Hetzner
hetzner.com

IP Address

176.9.149.219

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Falkenstein, Germany

ASN

AS24940

Organization

Hetzner

Nameservers

curitiba.ns.porkbun.com.fortaleza.ns.porkbun.com.maceio.ns.porkbun.com.salvador.ns.porkbun.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
229 ms10%
Speed Index
298 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
49 KB
2 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Hetzner

SEO Analysis

F34/100
8
11
3
Meta Tags4/15
Content1/12
Headings5/8
Technical6/25
E-E-A-T0/7
Images4/7
Links2/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
L
lisp.orglisp.org

John McCarthy, 1927-2011

No description available for this page.

Title Length24 chars

Recommended: 50-60 chars (~142px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

  • • Missing meta description — important for click-through rates in SERPs
  • • Very thin content (11 words). Search engines need substantial content for ranking.
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

14 issues found

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Crawlability

Sitemap
robots.txt

3 rules

Sitemap reference found

Allows all crawlers

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

F23/100
Bot Access
20/25
Machine Read.
3/25
Schema Data
0/25
Citation
0/25

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:13%
Words:8
Token eff.:Too Short
Sections/1K:10

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headingsavg 1w
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.
C
68/100
8
Passed
5
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
8/20
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.
2 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.
76/100
A+
5 mg
CO₂e / view
49.4 KB
Page Weight
95%
Cleaner Than
New Visitor
6 mg
vs
Returning (cached)
3 mg
Annual (10K/mo)
600 g
Emission Segments
Data Center
<0.001 g
Network
2 mg
Device
3 mg
Resource Breakdown
Images
48.8 KB
HTML
585 B
Green Hosting Verified
Hetzner Online GmbH
GWF Verified
2 recommendations
  • •Carbon footprint recommendation preview...
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B

Security Score

76%Good
Static / Informational

HTTPS

No WAF

31d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

17.03.2026

Valid Until

15.06.2026

Subject Alternative Names (2)

lisp.orgwww.lisp.org

SHA-256 Fingerprint

DB:5A:2D:AC:3B:FC:C8:35:63:03:22:68:43:12:4B:B3:7C:62:0E:C5...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

allow
GET, POST, HEAD
content-encoding
⚡ Brotli(br)
content-type
text/html
date
Thu, 14 May 2026 21:45:09 GMT
etag
W/"1cb-4b02a61fe1880"
last-modified
Wed, 26 Oct 2011 02:26:26 GMT
Good Warning Issue

Email Infrastructure

Fastmail

Score

20

SPF
DKIM
DMARC

MX Records (2)

in1-smtp.messagingengine.com
in2-smtp.messagingengine.com

Domain Information

lisp.org

Domain Age
29y 11m

Created

28.05.1996

Expires

27.05.2027

Last Updated

17.04.2026

Registrar

Porkbun 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.
F
32/100
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...
Upgrade to view recommendations

Typography & Readability

Times New Roman

WCAG AAA
75/100
Readability
/30
21/30

16px · LH --

Hierarchy
/20
16/20

2x ratio

WCAG
/25
24/25

9.4:1 min contrast

Performance
/25
14/25

1 font

Heading Font

Times New Roman

Serif32px

Body Font

Times New Roman

Serif16px

Contrast Ratio

9.4:1

WCAG AAA (≥7:1)

Reading Comfort

Single Font Family

center aligned
32px
h1
19px
h3

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

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 9.4:1).

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

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

✅ 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

10 unique colors
17.58:1 AAA Light
#ffffff
Background· 66.89999999999999%
#191919
Text· 11.1%
#dacfd0
Primary· 7.300000000000001%
#ccbdc2
Secondary· 3.4%
#a66772
Secondary· 2.5%
#78636c
Secondary· 2.2%
#cda8aa
Secondary· 1.6%
#38272a
Secondary· 1.1%

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Website Identity

lisp.org

29 years old
Location detected: 🇩🇪 Germanyvia ip
Porkbun LLC📧 Fastmail

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Last analyzed: 14 May 2026 at 21:45

Historical Analysis & Change Tracking