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langchain.dev

https://langchain.dev· First analyzed 15 May 2026· Updated 15 May 2026
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langchain.dev
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Mobile

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Hosting Provider

Vercel
vercel.com

IP Address

76.76.21.21

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Walnut, United States

ASN

AS16509

Organization

Vercel, Inc

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns-cloud-d4.googledomains.com.ns-cloud-d2.googledomains.com.ns-cloud-d1.googledomains.com.ns-cloud-d3.googledomains.com.

Performance

73

Core Web Vitals

Weight

First Contentful Paint
5.1 s10%
Speed Index
6.6 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
165 KB
91 requests

Image Optimization

Lazy LoadWebPAVIFResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Webflow

Technology Stack

16 Technologies Detected

Analytics

4
Google Analytics
Google Analytics 4
SegmentPlausible Analytics

Other

2
GSAPv3.12.5Lottie

Libraries

1
jQueryv3.5.1

UI Components

1
Swiper

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

Marketing

1
HubSpot

Email Marketing

1
Mailchimp

Advertising

1
LinkedIn Ads

CDN

1
Cloudflare

Customer Support

1
Zendesk

SEO Analysis

B76/100
22
6
0
Meta Tags15/15
Content10/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images5/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile3/4
Indexability3/3
L
langchain.devlangchain.dev

LangChain: Observe, Evaluate, and Deploy Reliable AI Agents

LangChain provides the engineering platform and open source frameworks developers use to build, test, and deploy reliable AI agents.

Title Length59 chars

Recommended: 50-60 chars (~346px / 580px)

Description Length132 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    470 URLs

    robots.txt

    1 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    6/100
    Poor
    2 13 2

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

    Sponsored

    AI & LLM Readiness

    D47/100
    Bot Access
    20/25
    Machine Read.
    13/25
    Schema Data
    0/25
    Citation
    14/25

    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:879
    Token eff.:Optimal
    Sections/1K:2.3
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary240w
    Descriptive Headingsavg 6.5w
    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
    85/100
    14
    Passed
    1
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    20/20
    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
    9/15
    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.
    78/100
    A+
    17 mg
    CO₂e / view
    164.6 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    19 mg
    vs
    Returning (cached)
    10 mg
    Annual (10K/mo)
    2.0 kg
    Emission Segments
    Data Center
    <0.001 g
    Network
    5 mg
    Device
    11 mg
    Resource Breakdown
    JavaScript
    131.1 KB
    Fonts
    1.0 KB
    HTML
    32.4 KB
    Green Hosting Verified
    Vercel
    Provider Match
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    56%Poor
    Interactive

    HTTPS

    WAF

    79d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Google Trust Services

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-256

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    05.05.2026

    Valid Until

    03.08.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (1)

    www.langchain.com

    SHA-256 Fingerprint

    1C:88:47:AC:54:64:CB:6E:DF:DF:D1:C4:99:F9:E7:EB:89:4C:E1:FE...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    age
    78713
    alt-svc
    h3=":443"; ma=86400
    cf-cache-status
    HIT
    cf-ray🇫🇷 Paris
    9fc35d3e2e5a9e5b-CDG
    content-encoding
    📦 Gzip(gzip)
    content-security-policy
    frame-ancestors 'self'
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    95

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    MX Records (1)

    smtp.google.com

    Domain Information

    langchain.dev

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot
    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
    77/100
    Mobile Friendly10 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
    width=device-width, initial-scale=1
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Twklausanne

    WCAG Partial
    72/100
    Readability
    /30
    23/30

    18px · LH 1.60

    Hierarchy
    /20
    17/20

    3.5x ratio · ✓ H1→H6

    WCAG
    /25
    12/25

    1:1 min contrast

    Performance
    /25
    20/25

    2 fonts · 3 req

    Heading Font

    Twklausanne

    Sans63px

    Body Font

    Twklausanne

    Sans18px

    Contrast Ratio

    1:1

    41 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    63px
    h1
    72px
    h2
    63px
    h3
    36px
    h4
    18px
    p

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

    ✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

    ❌ Very complex text: Flesch score 23/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 41 elements below WCAG AA threshold (min 1.0:1).

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

    ✅ Strong hierarchy: Headlines are 3.5x larger than body text.

    GGoogle FontsBuy on MyFontsFlesch 23

    Color Palette

    5 unique colors
    Light
    #030710
    Primary· 87.9%
    #046dd9
    Accent· 5.5%
    #87b6de
    Accent· 3%
    #122438
    Accent· 2.1%
    #265e98
    Accent· 1.5%

    Business & Marketing Stack

    9 Tools Detected

    Enterprise

    CRM Systems

    1
    HubSpotMid-Market

    Customer Relationship Management platforms

    Marketing Automation

    1
    MailchimpSMB

    Email marketing and automation platforms

    Behavior Analytics

    4
    Google Tag ManagerFree
    Google AnalyticsFree
    SegmentEnterprise
    PlausibleSMB

    User behavior and product analytics

    Advertising

    1
    LinkedIn AdsEnterprise

    Ad platforms and retargeting pixels

    Privacy & Cookies

    2
    CookieYesSMB
    CookiebotMid-Market

    Cookie consent and privacy compliance tools

    5

    Categories

    9

    Total Tools

    2

    Enterprise

    2

    Mid-Market

    Assessment: Sophisticated marketing and sales technology infrastructure

    Sponsored

    Scripts & Styles

    22 Resources

    20
    Scripts
    2
    Styles
    9
    Async
    4
    Defer

    Top Script Sources

    googletagmanager.com(3)cdn.jsdelivr.net(3)cdn-cookieyes.com(2)cdnjs.cloudflare.com(2)js-na2.hs-banner.com(1)

    Website Identity

    langchain.dev

    Location detected: 🇺🇸 United Statesvia ip
    📧 Google Workspaceen

    Social Profiles

    X (Twitter)LinkedIn

    Sponsored

    Last analyzed: 15 May 2026 at 16:02

    Historical Analysis & Change Tracking