StackOptic
Back to Search
buttondown.email favicon

buttondown.email

https://buttondown.email· First analyzed 27 Apr 2026· Updated 27 Apr 2026
Export
buttondown.email
Desktop screenshot of buttondown.email
Mobile screenshot of buttondown.email
Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)
aws.amazon.com

IP Address

54.221.251.148

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Ashburn, United States

ASN

AS14618

Organization

AWS EC2 (us-east-1)

Server

Heroku

CDN

Cloudflare

WAF

Cloudflare

Nameservers

apollo.ns.cloudflare.com.ivy.ns.cloudflare.com.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
775 ms10%
Speed Index
1.0 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
500 KB
37 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Hybrid
🔀 Hybrid
Frontend
Framework
Next.js
Styling
Tailwind CSS
Infrastructure
Platform
Vercel
CDN
Cloudflare

Technology Stack

4 Technologies Detected

Meta Frameworks

1
Next.js

CSS Frameworks

1
Tailwind CSS

Payments

1
Stripe

Platforms

1
Heroku

SEO Analysis

A84/100
25
5
0
Meta Tags14/15
Content8/12
Headings8/8
Technical20/25
E-E-A-T7/7
Images3/7
Links5/5
URL5/5
Social5/5
Freshness2/4
Mobile4/4
Indexability3/3
B
buttondown.emailbuttondown.email

Buttondown — Newsletter software for people like you

Buttondown is the last email platform you'll migrate to. We're focused on your success, not on bleeding you dry.

Title Length52 chars

Recommended: 50-60 chars (~322px / 580px)

Description Length112 chars

Recommended: 120-160 chars

Issues (0)

    5 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    744 URLs

    robots.txt

    5 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    25/100
    Needs Work
    7 10

    Sponsored

    AI & LLM Readiness

    C60/100
    Bot Access
    20/25
    Machine Read.
    11/25
    Schema Data
    10/25
    Citation
    19/25

    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:4%
    Words:746
    Token eff.:Optimal
    Sections/1K:5.4
    Depth:1/5

    Structured Data

    4 JSON-LD
    Person×1.3Organization×1.1WebSiteBreadcrumbList
    sameAs entity links

    Citation Readiness

    Opening Summary115w
    Descriptive Headingsavg 6.5w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (4)
    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
    83/100
    13
    Passed
    2
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    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
    11/15
    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.
    1 recommendation
    • •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.
    75/100
    A
    51 mg
    CO₂e / view
    499.7 KB
    Page Weight
    90%
    Cleaner Than
    New Visitor
    58 mg
    vs
    Returning (cached)
    29 mg
    Annual (10K/mo)
    6.1 kg
    Emission Segments
    Data Center
    3 mg
    Network
    15 mg
    Device
    33 mg
    Resource Breakdown
    JavaScript
    199.0 KB
    Images
    25.3 KB
    CSS
    249.7 KB
    HTML
    19.5 KB
    Other
    6.2 KB
    Green Hosting Verified
    Amazon Web Services (AWS)
    Provider Match
    2 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    0%Critical
    Critical / Transactional

    HTTPS

    No WAF

    60d

    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

    28.03.2026

    Valid Until

    26.06.2026

    Subject Alternative Names (1)

    buttondown.com

    SHA-256 Fingerprint

    73:B5:D2:67:4F:35:3A:A4:B9:EE:46:96:30:3E:82:32:C3:27:81:31...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-credentials
    true
    access-control-allow-headers
    X-CSRF-Token, X-Requested-With, Accept, Accept-Version, Cont...
    access-control-allow-methods
    GET,OPTIONS,PATCH,DELETE,POST,PUT
    access-control-allow-origin
    *
    age
    0
    cache-control
    🔴 No Cache(private, no-cache, no-store, max-age=0, must-revalidate)
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    90

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (5)

    alt4.aspmx.l.google.com
    alt3.aspmx.l.google.com
    aspmx.l.google.com
    alt2.aspmx.l.google.com

    +1 more

    Domain Information

    buttondown.email

    Domain Age
    8y 12m

    Created

    01.05.2017

    Expires

    01.05.2027

    Last Updated

    10.02.2026

    Registrar

    Cloudflare, Inc

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    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.
    B
    70/100
    Mobile Friendly
    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
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Auto Pro

    WCAG AA
    77/100
    Readability
    /30
    23/30

    24px · LH 1.33

    Hierarchy
    /20
    19/20

    4x ratio · ✓ H1→H6

    WCAG
    /25
    22/25

    4.7:1 min contrast

    Performance
    /25
    13/25

    1 font · 6 req

    Heading Font

    Auto Pro

    Sans96px

    Body Font

    Auto Pro

    Sans24px

    Contrast Ratio

    4.7:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    Single Font Family

    left aligned
    96px
    h1
    60px
    h2
    24px
    p

    ✅ Excellent readability: 24px body text is ideal for all devices.

    ⚠️ Tight line spacing (1.33). Increase to 1.4–1.6 for better readability.

    ✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 4.7:1).

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

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

    ✅ Lean font stack: 1 font families keeps load times fast.

    Buy on MyFontsFlesch 69

    Color Palette

    10 unique colors
    21:1 AAA Light
    #ffffff
    Background· 72.3%
    #000000
    Text· 3.5%
    #0067fd
    Primary· 5.6%
    #3a3c48
    Secondary· 5.3%
    #fef28b
    Primary· 4.7%
    #fbbea7
    Accent· 2.4%
    #b7c4ce
    Secondary· 2.4%
    #987e8f
    Secondary· 2.1%

    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

    Sponsored

    Scripts & Styles

    15 Resources

    14
    Scripts
    1
    Styles
    12
    Async
    0
    Defer

    Top Script Sources

    local(13)cdn.seline.com(1)

    Website Identity

    Buttondown

    Buttondown

    Organization

    Newsletter software for people like you. Everyone from Pulitzer Prize winners and Fortune 500s to study groups and first-time authors love Buttondown.

    support@buttondown.com
    buttondown.com
    8 years old
    Location detected: 🇺🇸 United Statesvia ip
    Cloudflare, Inc📧 Google WorkspaceenEst. 2017

    Sponsored

    Last analyzed: 27 Apr 2026 at 23:02

    Historical Analysis & Change Tracking