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optuna.org

https://optuna.org· First analyzed 29 May 2026· Updated 29 May 2026
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optuna.org
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Mobile

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Hosting Provider

GitHub Pages
pages.github.com

IP Address

185.199.110.153

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

ns-273.awsdns-34.com.ns-751.awsdns-29.net.ns-1161.awsdns-17.org.ns-1630.awsdns-11.co.uk.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
813 ms10%
Speed Index
1.1 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
295 KB
21 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
CMS
Medium
Infrastructure
Platform
GitHub Pages
CDN
Fastly

Technology Stack

8 Technologies Detected

CSS Frameworks

3
Bootstrapv4.4.1
Tailwind CSS
Ant Design

Icon Libraries

2
Font AwesomeMaterial Icons

Libraries

1
jQueryv3.4.1

Fonts

1
Google Fonts

Advertising

1
Google Ads

SEO Analysis

B70/100
21
6
1
Meta Tags13/15
Content12/12
Headings8/8
Technical15/25
E-E-A-T0/7
Images3/7
Links4/5
URL5/5
Social4/5
Freshness0/4
Mobile3/4
Indexability3/3
O
optuna.orgoptuna.org

Optuna - A hyperparameter optimization framework

Optuna is an automatic hyperparameter optimization software framework, particularly designed for machine learning.

Title Length48 chars

Recommended: 50-60 chars (~305px / 580px)

Description Length114 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (14/19) — critical for accessibility and SEO

7 issues found

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Crawlability

Sitemap

Type: standard

1 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

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.

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AI & LLM Readiness

D40/100
Bot Access
20/25
Machine Read.
12/25
Schema Data
0/25
Citation
8/25

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
code blocksnav
Text ratio:14%
Words:2,327
Token eff.:Optimal
Sections/1K:11.2
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary10w
Descriptive Headingsavg 2.9w
Canonical URL
Open Graph3/3
Twitter Card1/3
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.
B
76/100
10
Passed
4
Critical
0
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
16/20
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
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
6/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 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.
64/100
A+
37 mg
CO₂e / view
295.4 KB
Page Weight
90%
Cleaner Than
New Visitor
42 mg
vs
Returning (cached)
21 mg
Annual (10K/mo)
4.4 kg
Emission Segments
Data Center
8 mg
Network
9 mg
Device
20 mg
Resource Breakdown
JavaScript
77.8 KB
Images
167.1 KB
CSS
36.2 KB
Fonts
1.2 KB
HTML
13.0 KB
Green Hosting Not Verified
GitHub Pages
4 recommendations
  • •Carbon footprint recommendation preview...
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B

Security Score

71%Good
Static / Informational

HTTPS

No WAF

47d

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

17.04.2026

Valid Until

16.07.2026

Subject Alternative Names (1)

optuna.org

SHA-256 Fingerprint

8F:19:F2:58:A3:F1:B3:6A:ED:52:16:E6:F0:18:76:50:5B:88:04:A3...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges
bytes
access-control-allow-origin
*
age
0
cache-control
🟡 600s(max-age=600)
content-encoding
📦 Gzip(gzip)
content-length
13033
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

optuna.org

Domain Age
7y 6m

Created

05.11.2018

Expires

05.11.2026

Last Updated

11.09.2025

Registrar

Gandi SAS

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.
C
68/100
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=1.0
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Helvetica

WCAG Partial
66/100
Readability
/30
22/30

17px · LH 1.50

Hierarchy
/20
15/20

2.47x ratio

WCAG
/25
13/25

2.18:1 min contrast

Performance
/25
16/25

3 fonts · 1 req

Heading Font

Helvetica

Sans42px

Body Font

Helvetica

Sans17px

Contrast Ratio

2.18:1

13 issues

Reading Comfort

~40 CPL

Narrow lines
42px
h1
34px
h2
26px
h3
17px
p

✅ Excellent readability: 17px body text is ideal for all devices.

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

❌ Very complex text: Flesch score 9/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 2.2:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

GGoogle FontsBuy on MyFontsFlesch 9

Color Palette

11 unique colors
6.41:1 AA Light
#ffffff
Background· 60.099999999999994%
#665b6b
Secondary· 1.1%
#243c61
Primary· 9%
#506e82
Secondary· 3.9%
#d6dce4
Secondary· 3.6%
#cbbcba
Secondary· 3.3%
#677e8f
Secondary· 3.2%
#9e8688
Secondary· 3.1%

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

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Scripts & Styles

14 Resources

10
Scripts
4
Styles
3
Async
7
Defer

Top Script Sources

.(4)api.iconify.design(2)ajax.googleapis.com(1)cdn.jsdelivr.net(1)stackpath.bootstrapcdn.com(1)

Website Identity

optuna.org

7 years old
Location detected: 🇺🇸 United Statesvia ip
Gandi SASen

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Last analyzed: 29 May 2026 at 23:40

Historical Analysis & Change Tracking