physicsoverflow.org

https://physicsoverflow.org· First analyzed 04 May 2026· Updated 04 May 2026

Export

physicsoverflow.org

Mobile

Sponsored

Hosting Provider

Universitaet Bielefeld

IP Address

129.70.28.251

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Bielefeld, Germany

ASN

AS680

Organization

Universitaet Bielefeld

Server

Apache

Nameservers

ns1.dmsolutions.de.ns3.dmsolutions.de.ns2.dmsolutions.de.ns4.dmsolutions.de.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

671 ms10%

Speed Index

872 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

726 KB

34 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Universitaet Bielefeld

Technology Stack

5 Technologies Detected

Libraries

CSS Frameworks

Fonts

Web Servers

Languages

SEO Analysis

D59/100

Meta Tags13/15

Content11/12

Headings8/8

Technical10/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile3/4

Indexability3/3

physicsoverflow.orgphysicsoverflow.org

Recent activities (of the last week ) | PhysicsOverflow

A site including a section devoted to open paper refereeing and a forum for advanced physics, from graduate-level and beyond, including Theoretical Physics, ...

Description truncated.

Title Length55 chars

Recommended: 50-60 chars (~334px / 580px)

Description Length251 chars

Recommended: 120-160 chars

Issues (2)

• Most images missing alt text (21/25) — critical for accessibility and SEO
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

11 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

46,832 URLs

robots.txt

438 rules

Sitemap reference found

Local SEO

Local Search Readiness

1/100

Poor

16 2

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

Sponsored

AI & LLM Readiness

F23/100

Bot Access

12/25

Machine Read.

8/25

Schema Data

0/25

Citation

3/25

AI Bot Access

7/14 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:4%

Words:582

Token eff.:Optimal

Sections/1K:8.6

Structured Data

No Schema

Citation Readiness

Opening Summary16w

Descriptive Headingsavg 2.8w

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...

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.

40/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

8/20

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

Forms & Inputs

3/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

14/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

7/15

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.

4 recommendations

•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.

39/100

90 mg

CO₂e / view

725.7 KB

Page Weight

80%

Cleaner Than

New Visitor

103 mg

Returning (cached)

51 mg

Annual (10K/mo)

10.8 kg

Emission Segments

Data Center

20 mg

Network

22 mg

Device

48 mg

Resource Breakdown

JavaScript

522.2 KB

Images

44.1 KB

CSS

142.7 KB

Fonts

2.2 KB

HTML

14.4 KB

Green Hosting Not Verified

Universitaet Bielefeld

6 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

36d

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/1.1

Valid From

12.03.2026

Valid Until

10.06.2026

Subject Alternative Names (2)

physicsoverflow.orgwww.physicsoverflow.org

SHA-256 Fingerprint

CD:93:95:79:31:4A:7C:19:34:44:7F:1C:23:E4:99:12:4E:38:41:15...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Mon, 04 May 2026 17:46:15 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.physicsoverflow.org

Domain Information

physicsoverflow.org

Domain Age

12y 3m

Created

28.01.2014

Expires

28.01.2027

Last Updated

16.12.2025

Registrar

RegistryGate GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

35/100

Not 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.

4 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Roboto

WCAG Partial

62/100

Readability

/30

24/30

15px · LH 1.50

Hierarchy

/20

11/20

1.4x ratio · ✓ H1→H6

WCAG

/25

16/25

3.06:1 min contrast

Performance

/25

11/25

1 font · 4 req

Heading Font

Roboto

Sans21px

Body Font

Roboto

Sans15px

Contrast Ratio

3.06:1

1 issue

Reading Comfort

~68 CPL

Optimal (45–75)

21px

18px

15px

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

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~68 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 30/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 3.1:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

GGoogle FontsFlesch 30

Color Palette

8 unique colors

3.68:1 AA Large Light

#ffffff

Background· 81%

#82877d

Other· 2.7%

#ffc83a

Accent· 6.2%

#a8bdc5

Secondary· 3.8%

#c7d5da

Secondary· 2.5%

#eae6d9

Secondary· 2%

#fad777

Primary· 0.6%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

.(6)pulse.w3counter.com(1)rules.quantcount.com(1)secure.quantserve.com(1)code.jquery.com(1)

Website Identity