StackOptic
Back to Search
circuitcellar.com favicon

circuitcellar.com

https://circuitcellar.com· First analyzed 07 May 2026· Updated 07 May 2026
Export
circuitcellar.com
Desktop screenshot of circuitcellar.com
Mobile screenshot of circuitcellar.com
Mobile

Sponsored

Hosting Provider

Google Cloud Platform
cloud.google.com

IP Address

35.212.80.127

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Washington, United States

ASN

AS15169

Organization

Google Cloud (us-east4)

Server

Nginx

CDN

Proxy Cache

Nameservers

norm.ns.cloudflare.com.kate.ns.cloudflare.com.

Performance

90

Core Web Vitals

Weight

First Contentful Paint
1.5 s10%
Speed Index
1.9 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.4 MB
107 requests

Image Optimization

Lazy LoadWebPResponsiveJetpack Photon (WordPress)
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPressv6.9.1
cms
voiceCustom

Technology Stack

24 Technologies Detected

Plugins

15
Bns Featured CategoryCookie Law InfoMeks Flexible ShortcodesExtendifyLeaky PaywallLeaky Paywall CouponsSimple Sponsorships Premium
WP Rocket
Nextend Smart Slider3 ProLeaky Paywall Registration RedirectMolongui AuthorshipLeaky Paywall Recurring Payments
Yoast SEO
Jetpack
WP Rocket

Analytics

2
Google Analytics
Google Analytics 4

Libraries

1
jQuery

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Fonts

1
Google Fonts

Email Marketing

1
Constant Contact

Payments

1
Stripe

Web Servers

1
Nginx

SEO Analysis

B72/100
20
7
2
Meta Tags9/15
Content10/12
Headings3/8
Technical20/21
E-E-A-T3/7
Images3/7
Links5/5
URL5/5
Social4/5
Freshness4/4
Mobile3/4
Indexability3/3
C
circuitcellar.comcircuitcellar.com

Home - Circuit Cellar

Premier media resource for embedded electronics tech. Embedded Systems, microcontrollers, Raspberry Pi, Arduino, & more info to inspire professional engineers.

Title Length21 chars

Recommended: 50-60 chars (~124px / 580px)

Description Length159 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (63/117) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Local SEO

Local Search Readiness

13/100
Poor
4 12 1

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

Sponsored

AI & LLM Readiness

D53/100
Bot Access
20/25
Machine Read.
11/25
Schema Data
4/25
Citation
18/25

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
nav
Text ratio:3%
Words:1,059
Token eff.:Optimal
Sections/1K:1.9
Depth:1/5

Structured Data

3 JSON-LD
WebSiteBreadcrumbListSearchAction

Citation Readiness

Opening Summary732w
Descriptive Headingsavg 4.3w
Canonical URL
Open Graph2/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
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
70/100
11
Passed
4
Critical
3
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
17/20
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
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
2/15
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.
62/100
C
146 mg
CO₂e / view
1.4 MB
Page Weight
60%
Cleaner Than
New Visitor
167 mg
vs
Returning (cached)
84 mg
Annual (10K/mo)
17.5 kg
Emission Segments
Data Center
7 mg
Network
43 mg
Device
96 mg
Resource Breakdown
JavaScript
403.4 KB
Images
877.9 KB
CSS
132.5 KB
Fonts
2.0 KB
HTML
28.9 KB
Other
1.5 KB
Green Hosting Verified
Google Cloud
GWF Verified
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

0%Critical
Critical / Transactional

HTTPS

No WAF

74d

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

21.04.2026

Valid Until

20.07.2026

Subject Alternative Names (2)

circuitcellar.comwww.circuitcellar.com

SHA-256 Fingerprint

B2:65:C1:74:8E:A3:A8:E3:A8:55:5D:A4:23:5F:90:22:C9:9D:DB:05...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

cache-control
🟡 3s(max-age=3, must-revalidate, max-age=172800)
content-encoding
⚡ Brotli(br)
content-type
text/html; charset=UTF-8
date
Thu, 07 May 2026 11:47:57 GMT
expires
Fri, 08 May 2026 21:21:11 GMT
host-header
8441280b0c35cbc1147f8ba998a563a7
Good Warning Issue

Email Infrastructure

Google Workspace

Score

90

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt1.aspmx.l.google.com
alt3.aspmx.l.google.com
alt2.aspmx.l.google.com
aspmx.l.google.com

+1 more

Domain Information

circuitcellar.com

Domain Age
30y 3m

Created

23.01.1996

Expires

24.01.2027

Last Updated

25.01.2026

Registrar

GoDaddy.com, LLC

DNSSEC
Not Enabled

Privacy & Compliance

CookieYes

Cookie Consent Banner
CookieYes
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: CookieYes
Privacy policy page linked
Data Protection Officer mentioned

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 Friendly6 breakpoints
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
user-scalable=yes, width=device-width, initial-scale=1.0, maximum-scale=1, minimum-scale=1
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Roboto Slab + Open Sans

WCAG Partial
62/100
Readability
/30
17/30

12px · LH 1.47

Hierarchy
/20
12/20

3.33x ratio

WCAG
/25
18/25

1:1 min contrast

Performance
/25
15/25

2 fonts · 2 req

Heading Font

Roboto Slab

Sans40px

Body Font

Open Sans

Sans12px

Contrast Ratio

1:1

35 issues

Reading Comfort

~48 CPL

Optimal (45–75)
40px
h1
25px
h2
15px
h4
12px
p

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

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

✅ Optimal line length: ~48 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 35 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 3.3x larger than body text.

GGoogle FontsBuy on MyFontsFluid Type (rem)

Color Palette

11 unique colors
16.67:1 AAA Light
#ffffff
Background· 27.9%
#1d1e21
Text· 7.2%
#080b0f
Primary· 6.5%
#6c5c4e
Secondary· 5.9%
#042f1e
Accent· 5.3%
#8eb3ba
Secondary· 5%
#44596a
Secondary· 4.2%
#412926
Secondary· 4%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

1
GDPR Cookie ConsentFree

Cookie consent and privacy compliance tools

2

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

Sponsored

Scripts & Styles

30 Resources

20
Scripts
10
Styles
11
Async
4
Defer

Top Script Sources

linuxgizmos.advertserve.com(6)circuitcellar.com(6)googletagmanager.com(4)c0.wp.com(2)google-analytics.com(1)

Website Identity

Home - Circuit Cellar

Premier media resource for embedded electronics tech. Embedded Systems, microcontrollers, Raspberry Pi, Arduino, & more info to inspire professional engineers.

circuitcellar.com/
30 years old
Location detected: 🇺🇸 United Statesvia ip
GoDaddy.com, LLC📧 Google Workspaceen-US

Sponsored

Last analyzed: 07 May 2026 at 11:48

Historical Analysis & Change Tracking