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resend.com

https://resend.com· First analyzed 05 May 2026· Updated 05 May 2026
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resend.com
Desktop screenshot of resend.com
Mobile screenshot of resend.com
Mobile

Sponsored

Hosting Provider

Vercel
vercel.com

IP Address

76.76.21.22

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Walnut, United States

ASN

AS16509

Organization

Vercel, Inc

Server

Vercel

Nameservers

ns-399.awsdns-49.com.ns-1017.awsdns-63.net.ns-1047.awsdns-02.org.ns-1910.awsdns-46.co.uk.

Performance

97

Core Web Vitals

Weight

First Contentful Paint
1.0 s10%
Speed Index
1.3 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
11.4 MB
140 requests

Image Optimization

Lazy LoadWebPResponsiveVercel Image Optimization
0–49
50–89
90–100

Architecture Stack

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

Technology Stack

6 Technologies Detected

Analytics

2
Plausible AnalyticsPlausible

Meta Frameworks

1
Next.js

Other

1
Lottie

CSS Frameworks

1
Tailwind CSS

Platforms

1
Vercel

SEO Analysis

B77/100
23
7
0
Meta Tags8/15
Content6/12
Headings7/8
Technical24/25
E-E-A-T5/7
Images7/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile3/4
Indexability3/3
R
resend.comresend.com

Resend · Email for developers

The best way to reach humans instead of spam folders. Deliver transactional and marketing emails at scale.

Title Length29 chars

Recommended: 50-60 chars (~176px / 580px)

Description Length106 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    10 URLs

    10 sub-sitemaps

    robots.txt

    5 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    18/100
    Poor
    5 12

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

    Sponsored

    AI & LLM Readiness

    C64/100
    Bot Access
    20/25
    Machine Read.
    18/25
    Schema Data
    10/25
    Citation
    16/25

    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
    Text ratio:3%
    Words:2,981
    Token eff.:Optimal

    Structured Data

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

    Citation Readiness

    Opening Summary24w
    Descriptive Headingsavg 3w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (7)
    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
    14
    Passed
    2
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    18/20
    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
    4/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    2 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.
    46/100
    F
    1.18 g
    CO₂e / view
    11.4 MB
    Page Weight
    5%
    Cleaner Than
    New Visitor
    1.34 g
    vs
    Returning (cached)
    672 mg
    Annual (10K/mo)
    141.1 kg
    Emission Segments
    Data Center
    58 mg
    Network
    346 mg
    Device
    773 mg
    Resource Breakdown
    JavaScript
    2.9 MB
    Images
    863.3 KB
    CSS
    126.8 KB
    Fonts
    624.7 KB
    HTML
    66.3 KB
    Other
    6.8 MB
    Green Hosting Verified
    Vercel
    Provider Match
    7 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A+

    Security Score

    100%Excellent
    Static / Informational

    HTTPS

    No WAF

    84d

    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

    29.04.2026

    Valid Until

    28.07.2026

    Subject Alternative Names (1)

    resend.com

    SHA-256 Fingerprint

    83:29:4A:CA:AB:DC:F5:E8:CC:4B:BF:D6:1E:22:A2:04:20:7C:20:87...

    Upgrade to view header details

    HTTP Headers

    Developer Console

    age
    0
    cache-control
    🔴 No Cache(private, no-cache, no-store, max-age=0, must-revalidate)
    content-encoding
    ⚡ Brotli(br)
    content-security-policy
    default-src 'self'; connect-src 'self' data: https://api....
    content-type
    text/html; charset=utf-8
    date
    Tue, 05 May 2026 02:50:29 GMT
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    95

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    MX Records (5)

    alt4.aspmx.l.google.com
    alt1.aspmx.l.google.com
    alt2.aspmx.l.google.com
    aspmx.l.google.com

    +1 more

    Domain Information

    resend.com

    Domain Age
    23y 8m

    Created

    23.08.2002

    Expires

    23.08.2026

    Last Updated

    19.07.2025

    Registrar

    Amazon Registrar, 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.
    A
    85/100
    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

    Typography & Readability

    domaine + inter

    WCAG Partial
    66/100
    Readability
    /30
    24/30

    18px · LH 1.50

    Hierarchy
    /20
    14/20

    5.33x ratio

    WCAG
    /25
    16/25

    1:1 min contrast

    Performance
    /25
    12/25

    3 fonts · 8 req

    Heading Font

    domaine

    Sans96px

    Body Font

    inter

    Sans18px

    Contrast Ratio

    1:1

    39 issues

    Reading Comfort

    ~40 CPL

    Narrow lines
    96px
    h1
    77px
    h2
    20px
    h4
    18px
    p

    ✅ Excellent readability: 18px body text is ideal for all devices.

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

    ⚠️ Hard to read: Flesch score 47/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 39 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 5.3x larger than body text.

    Buy on MyFontsFluid Type (rem)Flesch 47

    Color Palette

    3 unique colors
    2.45:1 Fail Dark
    #020202
    Primary· 86.1%
    #4c4d4d
    Other· 3.4%

    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

    25 Resources

    20
    Scripts
    5
    Styles
    20
    Async
    0
    Defer

    Top Script Sources

    local(20)

    Website Identity

    Resend

    Resend

    Organization

    Email API for developers

    resend.com/
    23 years old
    Location detected: 🇺🇸 United Statesvia ip
    Amazon Registrar, Inc.📧 Google WorkspaceenEst. 2022

    Sponsored

    Last analyzed: 05 May 2026 at 02:50

    Historical Analysis & Change Tracking