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slack.dev

https://slack.dev· First analyzed 14 May 2026· Updated 14 May 2026
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slack.dev
Desktop screenshot of slack.dev
Mobile screenshot of slack.dev
Mobile

Sponsored

Hosting Provider

Automattic, Inc

IP Address

192.0.66.150

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS2635

Server

Nginx

CDN

CDN

Nameservers

dns1.p05.nsone.net.dns2.p05.nsone.net.dns3.p05.nsone.net.dns4.p05.nsone.net.+4 more

Performance

100

Core Web Vitals

Weight

First Contentful Paint
435 ms10%
Speed Index
566 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
646 KB
50 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPressv6.9.4
cms
octothorpe::frontendv1.0.0Custom
by Mina Markham
View Theme

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

9 Technologies Detected

Plugins

4
PrismaticOctothorpe Core
Yoast SEO
Jetpack

Other

1
Lottie

CSS Frameworks

1
Tailwind CSS

Analytics

1
Google Analytics

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

A83/100
23
6
1
Meta Tags10/15
Content11/12
Headings8/8
Technical21/25
E-E-A-T5/7
Images3/7
Links5/5
URL5/5
Social4/5
Freshness4/4
Mobile4/4
Indexability3/3
S
slack.devslack.dev

Developer Hub | Slack Developers

Slack’s API documentation, developer community, and development resources.

Title Length32 chars

Recommended: 50-60 chars (~189px / 580px)

Description Length74 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

8 URLs

8 sub-sitemaps

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

15/100
Poor
4 13

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

Sponsored

AI & LLM Readiness

C62/100
Bot Access
20/25
Machine Read.
17/25
Schema Data
8/25
Citation
17/25

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.txtvalid
llms-full.txt
Semantic HTML
Heading Hierarchy
navheader/footer
Text ratio:5%
Words:912
Token eff.:Optimal
Sections/1K:24.1
Depth:2/5

Structured Data

5 JSON-LD
Organization×1.1WebSiteBreadcrumbListSearchAction
sameAs entity links

Citation Readiness

Opening Summary16w
Descriptive Headingsavg 3.7w
Canonical URL
Open Graph3/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (8)
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.
A+
92/100
16
Passed
1
Critical
0
Warnings
Images & Alt Text
20/20
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
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
15/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
10/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

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.
55/100
B
80 mg
CO₂e / view
645.9 KB
Page Weight
80%
Cleaner Than
New Visitor
91 mg
vs
Returning (cached)
46 mg
Annual (10K/mo)
9.6 kg
Emission Segments
Data Center
18 mg
Network
19 mg
Device
43 mg
Resource Breakdown
JavaScript
140.0 KB
Images
424.7 KB
CSS
40.7 KB
HTML
23.2 KB
Other
17.3 KB
Green Hosting Not Verified
Automattic, Inc
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

81d

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/2

Valid From

05.05.2026

Valid Until

03.08.2026

Subject Alternative Names (2)

slack.devwww.slack.dev

SHA-256 Fingerprint

26:54:F5:22:26:77:55:5D:4F:83:E8:38:C6:BE:1A:65:EC:9E:D2:6B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
cache-control
🟡 300s(max-age=300, must-revalidate)
content-encoding
⚡ Brotli(br)
content-type
text/html; charset=UTF-8
date
Thu, 14 May 2026 15:24:19 GMT
host-header
a9130478a60e5f9135f765b23f26593b
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

slack.dev

DNSSEC
Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner
OneTrust
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: OneTrust
Privacy policy page linked

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
62/100
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.
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

-apple-system

WCAG Partial
74/100
Readability
/30
25/30

16px · LH 1.55

Hierarchy
/20
19/20

4x ratio · ✓ H1→H6

WCAG
/25
18/25

1.58:1 min contrast

Performance
/25
12/25

System fonts

Heading Font

-apple-system

Sans64px

Body Font

-apple-system

Sans16px

Contrast Ratio

1.58:1

1 issue

Reading Comfort

~38 CPL

Narrow lines
64px
h1
56px
h2
32px
h3
16px
p

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

✅ Optimal line spacing: 1.55 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 1.6:1).

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

✅ Strong hierarchy: Headlines are 4.0x larger than body text.

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

Fluid Type (rem)Flesch 65

Color Palette

4 unique colors
Light
#4a154b
Accent· 73.9%
#380639
Primary· 14.799999999999999%
#ccbcc5
Secondary· 6%
#5b2a4b
Secondary· 5.2%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

1
OneTrustEnterprise

Cookie consent and privacy compliance tools

2

Categories

3

Total Tools

1

Enterprise

0

Mid-Market

Assessment: Well-developed marketing technology stack

Sponsored

Scripts & Styles

7 Resources

6
Scripts
1
Styles
2
Async
1
Defer

Top Script Sources

slack.dev(3)googletagmanager.com(1)cdn.cookielaw.org(1)stats.wp.com(1)

Website Identity

Slack Developers

Slack Developers

Organization

Build context-aware AI apps and agents with Slack, the work operating system. Get tools, documentation, community, and learning resources for developers.

slack.dev/
Location detected: 🇺🇸 United Statesvia ip
en-US

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Last analyzed: 14 May 2026 at 15:24

Historical Analysis & Change Tracking