Back to Search
functional.cafe favicon

functional.cafe

https://functional.cafe· First analyzed 28 May 2026· Updated 28 May 2026
Export
functional.cafe
Desktop screenshot of functional.cafe
Mobile screenshot of functional.cafe
Mobile

Sponsored

Hosting Provider

DataCamp Limited

IP Address

185.111.111.155

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS212238

Organization

DataCamp Limited

Server

BunnyCDN-FR1-1072

CDN

CDN

Nameservers

coco.bunny.net.kiki.bunny.net.

Performance

73

Core Web Vitals

Weight

First Contentful Paint
5.0 s10%
Speed Index
6.5 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.3 MB
142 requests

Image Optimization

WebPAVIFResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
DataCamp Limited
CDN
CDN

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

2 Technologies Detected

CSS Frameworks

1
Tailwind CSS

CDN

1
Bunny CDN

SEO Analysis

D56/100
15
10
1
Meta Tags7/15
Content10/12
Headings3/8
Technical14/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile4/4
Indexability3/3
F
functional.cafefunctional.cafe

About - Functional Café

functional.cafe is an instance for people interested in functional programming and languages.

Title Length23 chars

Recommended: 50-60 chars (~138px / 580px)

Description Length93 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (3/4) — critical for accessibility and SEO

11 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

6 rules

Local SEO

Local Search Readiness

6/100
Poor
2 14 2

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

Sponsored

AI & LLM Readiness

F39/100
Bot Access
19/25
Machine Read.
8/25
Schema Data
0/25
Citation
12/25

AI Bot Access

13/14 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:9%
Words:651
Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary47w
Descriptive Headings
Canonical URL
Open Graph3/3
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
74/100
13
Passed
5
Critical
2
Warnings
Images & Alt Text
18/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
9/20
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
4/15
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.
70/100
B
135 mg
CO₂e / view
1.3 MB
Page Weight
70%
Cleaner Than
New Visitor
155 mg
vs
Returning (cached)
77 mg
Annual (10K/mo)
16.2 kg
Emission Segments
Data Center
7 mg
Network
40 mg
Device
89 mg
Resource Breakdown
JavaScript
678.4 KB
CSS
632.0 KB
HTML
14.0 KB
Other
16.1 KB
Green Hosting Verified
Hetzner Online GmbH
GWF Verified
1 recommendation
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A

Security Score

81%Very Good
Interactive

HTTPS

No WAF

84d

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

22.05.2026

Valid Until

20.08.2026

Subject Alternative Names (1)

functional.cafe

SHA-256 Fingerprint

A0:60:D7:56:E1:41:56:CC:54:CB:1D:35:A6:28:16:F1:C8:1B:F5:9B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

cache-control
🔴 No Cache(no-cache)
cdn-cache
MISS
cdn-cachedat
05/28/2026 15:34:57
cdn-edgestorageid
1318
cdn-proxyver
1.55
cdn-pullzone
3710728
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

65

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

mxext2.mailbox.org
mxext3.mailbox.org
mxext1.mailbox.org

Domain Information

functional.cafe

Domain Age
9y 1m

Created

05.04.2017

Expires

05.04.2027

Last Updated

29.11.2025

Registrar

TLD Registrar Solutions Ltd.

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.
B
71/100
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, viewport-fit=cover
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

mastodon-font-sans-serif

WCAG AAA
72/100
Readability
/30
19/30

15px · LH 1.47

Hierarchy
/20
11/20

1.6x ratio

WCAG
/25
24/25

7.35:1 min contrast

Performance
/25
18/25

1 font · 3 req

Heading Font

mastodon-font-sans-serif

Sans24px

Body Font

mastodon-font-sans-serif

Sans15px

Contrast Ratio

7.35:1

WCAG AAA (≥7:1)

Reading Comfort

~36 CPL

Narrow lines
24px
h1
15px
h4
15px
p

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.47 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 28/100. Consider shorter sentences and simpler words.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 7.3:1).

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

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

Buy on MyFontsFlesch 28

Color Palette

9 unique colors
7.4:1 AAA Light
#ffffff
Background· 70.19999999999999%
#565558
Other· 1.8%
#181820
Primary· 0%
#382e5d
Secondary· 2.1%

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

Sponsored

Scripts & Styles

13 Resources

3
Scripts
10
Styles
0
Async
0
Defer

Top Script Sources

local(3)

Website Identity

functional.cafe

marco@functional.cafe
9 years old
Location detected: 🇩🇪 Germanyvia ip
TLD Registrar Solutions Ltd.en-GB

Social Profiles

GitHub

Sponsored

Last analyzed: 28 May 2026 at 15:35

Historical Analysis & Change Tracking