rdrr.io

https://rdrr.io· First analyzed 30 Apr 2026· Updated 30 Apr 2026

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rdrr.io

Mobile

Sponsored

Hosting Provider

Hetzner

hetzner.com

IP Address

138.201.54.179

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Falkenstein, Germany

ASN

AS24940

Organization

Hetzner

Nameservers

ns-1181.awsdns-19.org.ns-15.awsdns-01.com.ns-1820.awsdns-35.co.uk.ns-669.awsdns-19.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

530 ms10%

Speed Index

689 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

312 KB

18 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Hetzner

Technology Stack

6 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Advertising

Google Ads Google AdSense

CSS Frameworks

Tailwind CSS

Fonts

Google Fonts

SEO Analysis

C65/100

Meta Tags7/15

Content7/12

Headings7/8

Technical22/25

E-E-A-T2/7

Images1/7

Links5/5

URL5/5

Social2/5

Freshness0/4

Mobile4/4

Indexability3/3

rdrr.iordrr.io

R Package Documentation

A comprehensive index of R packages and documentation from CRAN, Bioconductor, GitHub and R-Forge.

Title Length23 chars

Recommended: 50-60 chars (~143px / 580px)

Description Length98 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (1/1) — critical for accessibility and SEO

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

85 URLs

85 sub-sitemaps

robots.txt

6 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

15/100

Poor

5 13

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

Sponsored

AI & LLM Readiness

D42/100

Bot Access

20/25

Machine Read.

3/25

Schema Data

7/25

Citation

12/25

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:263

Token eff.:Too Short

Sections/1K:19

Structured Data

2 JSON-LD

Organization×1.1WebSiteSearchAction

sameAs entity links

Citation Readiness

Opening Summary11w

Descriptive Headingsavg 8.6w

Canonical URL

Open Graph2/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (10)

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.

51/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

11/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

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.

65/100

A+

32 mg

CO₂e / view

312.3 KB

Page Weight

90%

Cleaner Than

New Visitor

36 mg

Returning (cached)

18 mg

Annual (10K/mo)

3.8 kg

Emission Segments

Data Center

2 mg

Network

9 mg

Device

21 mg

Resource Breakdown

JavaScript

161.1 KB

Images

8.8 KB

CSS

125.3 KB

Fonts

3.2 KB

HTML

13.9 KB

Green Hosting Verified

Hetzner Online GmbH

GWF Verified

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

46%Poor

Interactive

HTTPS

No WAF

41d

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

12.03.2026

Valid Until

10.06.2026

Subject Alternative Names (5)

*.ext.rdrr.io*.proxy.rdrr.io*.rdrr.io*.svc.rdrr.iordrr.io

SHA-256 Fingerprint

6D:80:86:17:09:1B:A1:11:0D:43:2A:4E:1D:7B:6A:C7:0F:77:CA:E2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 1 Hours(s-maxage=3600, public, max-age=3600)

content-length

13967

content-type

text/html; charset=utf-8

date

Thu, 30 Apr 2026 12:03:09 GMT

expires

Thu, 30 Apr 2026 11:42:07 GMT

strict-transport-security

max-age=15724800; includeSubDomains

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

MX Records (5)

alt2.aspmx.l.google.com

alt1.aspmx.l.google.com

alt3.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

rdrr.io

Domain Age

11y 3m

Created

20.01.2015

Expires

20.01.2027

Last Updated

21.12.2025

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.

67/100

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, minimum-scale=1

1 recommendation

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Lato

WCAG Partial

67/100

Readability

/30

22/30

14px · LH 1.43

Hierarchy

/20

15/20

2x ratio

WCAG

/25

17/25

1:1 min contrast

Performance

/25

13/25

1 font · 3 req

Heading Font

Lato

Sans28px

Body Font

Lato

Sans14px

Contrast Ratio

1:1

16 issues

Reading Comfort

Single Font Family

left aligned

28px

24px

15px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 16 elements below WCAG AA threshold (min 1.0:1).

⚠️ 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.

GGoogle Fonts Buy on MyFonts

Color Palette

10 unique colors

Light

#ffffff

Background· 76.6%

#2185d0

Primary· 6.3%

#274053

Secondary· 4.5%

#f2711d

Primary· 3.8%

#e8ebec

Secondary· 3.2%

#93c9ad

Secondary· 1.9%

#7096ae

Secondary· 1.4%

#f6e1d0

Accent· 1.1%

Business & Marketing Stack

3 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)platform.twitter.com(2)googletagmanager.com(1)pagead2.googlesyndication.com(1)

Website Identity

R Package Documentation

Organization

ian@mutexlabs.com

11 years old

Location detected: 🇩🇪 Germanyvia ip

Gandi SAS📧 Google Workspaceen

Social Profiles

X (Twitter)GitHub

Sponsored

Last analyzed: 30 Apr 2026 at 12:03

Historical Analysis & Change Tracking