hpcalc.org

https://hpcalc.org· First analyzed 15 May 2026· Updated 15 May 2026

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hpcalc.org

Mobile

Sponsored

Hosting Provider

Linode (Akamai)

linode.com

IP Address

173.255.244.176

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Fremont, United States

ASN

AS63949

Organization

Linode

Server

Apache

Nameservers

ns2.r4l.com.ns1.r4l.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

497 ms10%

Speed Index

646 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

94 KB

16 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Linode (Akamai)

Technology Stack

1 Technologies Detected

Web Servers

Apachev2.4.52

SEO Analysis

D57/100

Meta Tags11/15

Content12/12

Headings0/8

Technical10/25

E-E-A-T3/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

hpcalc.orghpcalc.org

hpcalc.org - HP Calculator Archive

The largest, best source on the Internet for software for and information about Hewlett Packard's HP Prime, HP 50g, HP 49G, HP 48 series, HP 38G, and HP 28 s...

Description truncated.

Title Length34 chars

Recommended: 50-60 chars (~199px / 580px)

Description Length183 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

10 issues found

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Crawlability

Sitemap

robots.txt

6 rules

Local SEO

Local Search Readiness

3/100

Poor

1 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

F36/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

0/25

Citation

6/25

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:28%

Words:2,044

Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary53w

Descriptive Headings

Canonical URL

Open Graph0/3

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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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.

58/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

3/20

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.

72/100

A+

10 mg

CO₂e / view

94.0 KB

Page Weight

95%

Cleaner Than

New Visitor

11 mg

Returning (cached)

5 mg

Annual (10K/mo)

1.1 kg

Emission Segments

Data Center

<0.001 g

Network

3 mg

Device

6 mg

Resource Breakdown

Images

85.7 KB

CSS

897 B

HTML

7.4 KB

Green Hosting Verified

Linode (Akamai)

Provider Match

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

51d

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/1.1

Valid From

06.04.2026

Valid Until

05.07.2026

Subject Alternative Names (1)

www.hpcalc.org

SHA-256 Fingerprint

19:74:E3:3A:39:BA:5E:AC:CD:CD:98:35:2B:D3:4B:E0:F6:35:E2:AD...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

7267

content-type

text/html; charset=UTF-8

date

Fri, 15 May 2026 05:47:23 GMT

keep-alive

timeout=5, max=100

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.hpcalc.org

Domain Information

hpcalc.org

Domain Age

27y 11m

Created

10.06.1998

Expires

09.06.2027

Last Updated

08.01.2026

Registrar

Register4Less, Inc.

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.

45/100

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.

Viewport

width=device-width, initial-scale=0.9

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Arial

WCAG AAA

76/100

Readability

/30

22/30

16px · LH --

Hierarchy

/20

10/20

WCAG

/25

24/25

16.01:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Arial

Body Font

Arial

Sans16px

Contrast Ratio

16.01:1

WCAG AAA (≥7:1)

Reading Comfort

Single Family

left aligned

16px

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

⚠️ Hard to read: Flesch score 46/100. Simplify sentences for wider reach.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 16.0:1).

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

Flesch 46

Color Palette

11 unique colors

5.98:1 AA Light

#ffffff

Background· 80.60000000000001%

#5f6469

Other· 1.4%

#151b1e

Secondary· 1.8%

#030607

Primary· 1.7%

#2d3539

Secondary· 1.6%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

hpcalc.org

27 years old

Location detected: 🇺🇸 United Statesvia ip

Register4Less, Inc.

Sponsored

Last analyzed: 15 May 2026 at 05:47

Historical Analysis & Change Tracking