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certifier.io

https://certifier.io· First analyzed 17 May 2026· Updated 17 May 2026
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certifier.io
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Mobile screenshot of certifier.io
Mobile

Sponsored

Hosting Provider

Vercel
vercel.com

IP Address

76.76.21.21

Site Location

🇵🇱 Cracow, Polandvia schema_nap

Server Location

🇺🇸 Walnut, United States

ASN

AS16509

Organization

Vercel, Inc

Server

Vercel

CDN

Cloudflare

WAF

Cloudflare

Nameservers

glen.ns.cloudflare.com.liv.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
570 ms10%
Speed Index
741 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
5.4 MB
165 requests

Image Optimization

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

Architecture Stack

Hybrid
⚡ SSG
Frontend
Framework
Next.js
Styling
Tailwind CSS
CMS
HubSpot CMS
Infrastructure
Platform
Vercel
CDN
Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

17 Technologies Detected

Analytics

5
Google Analytics
Google Analytics 4
Hotjar
AmplitudeMicrosoft Clarity

Other

2
GSAPLottie

CSS Frameworks

2
Tailwind CSS
Ant Design

Customer Support

2
IntercomZendesk

Meta Frameworks

1
Next.js

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

Marketing

1
HubSpot

Reviews

1
Trustpilot

Platforms

1
Vercel

SEO Analysis

A81/100
26
3
0
Meta Tags13/15
Content6/12
Headings8/8
Technical24/25
E-E-A-T2/7
Images7/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile3/4
Indexability3/3
C
certifier.iocertifier.io

Certifier | #1 Certificate Maker Software

Certifier is the leading software to create, issue, and verify certificates in bulk. An AI-powered platform for managing digital certificates, credentials, a...

Description truncated.
Title Length41 chars

Recommended: 50-60 chars (~246px / 580px)

Description Length167 chars

Recommended: 120-160 chars

Issues (0)

    3 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    3,049 URLs

    robots.txt

    5 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    42/100
    Fair
    12 9

    Sponsored

    AI & LLM Readiness

    D42/100
    Bot Access
    20/25
    Machine Read.
    1/25
    Schema Data
    10/25
    Citation
    11/25

    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
    Text ratio:1%
    Words:4,391
    Token eff.:Poor Structure

    Structured Data

    5 JSON-LD
    Person×1.3Organization×1.1WebSiteVideoObject
    sameAs entity links

    Citation Readiness

    Opening Summary33w
    Descriptive Headings
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (10)
    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
    87/100
    14
    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
    20/20
    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.
    47/100
    F
    553 mg
    CO₂e / view
    5.4 MB
    Page Weight
    5%
    Cleaner Than
    New Visitor
    633 mg
    vs
    Returning (cached)
    316 mg
    Annual (10K/mo)
    66.4 kg
    Emission Segments
    Data Center
    27 mg
    Network
    163 mg
    Device
    364 mg
    Resource Breakdown
    JavaScript
    2.0 MB
    Images
    254.2 KB
    CSS
    41.0 KB
    Fonts
    268.4 KB
    HTML
    234.2 KB
    Other
    2.6 MB
    Green Hosting Verified
    Vercel
    Provider Match
    6 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    76%Good
    Static / Informational

    HTTPS

    No WAF

    41d

    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

    29.03.2026

    Valid Until

    27.06.2026

    Subject Alternative Names (1)

    certifier.io

    SHA-256 Fingerprint

    6A:FB:76:7D:CF:0B:FA:A6:AB:33:58:61:48:90:5C:90:17:AC:BA:FE...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-origin
    *
    age
    86706
    cache-control
    🟡 0s(public, max-age=0, must-revalidate)
    content-disposition
    inline
    content-encoding
    ⚡ Brotli(br)
    content-type
    text/html; charset=utf-8
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    70

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (5)

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

    +1 more

    Domain Information

    certifier.io

    Domain Age
    5y 1m

    Created

    04.04.2021

    Expires

    04.04.2027

    Last Updated

    10.03.2026

    Registrar

    Cloudflare, Inc

    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
    Data Protection Officer mentioned
    Legitimate interest basis mentioned

    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 Friendly26 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
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    ttFirsNeue

    WCAG AA
    70/100
    Readability
    /30
    20/30

    18px · LH 1.44

    Hierarchy
    /20
    12/20

    0.78x ratio · ✓ H1→H6

    WCAG
    /25
    22/25

    4.67:1 min contrast

    Performance
    /25
    16/25

    1 font · 10 req

    Heading Font

    ttFirsNeue

    Sans14px

    Body Font

    ttFirsNeue

    Sans18px

    Contrast Ratio

    4.67:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    ~35 CPL

    Narrow lines
    14px
    h1
    48px
    h2
    28px
    h3
    18px
    p
    Octave
    Scale

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

    ✅ Optimal line spacing: 1.44 ratio (ideal range 1.4–1.6).

    ❌ Very complex text: Flesch score 20/100. Consider shorter sentences and simpler words.

    ✅ 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.

    ⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

    GGoogle FontsFlesch 20

    Color Palette

    5 unique colors
    10.37:1 AAA Dark
    #404040
    Other· 62.599999999999994%
    #ffffff
    Primary· 29.900000000000002%
    #1f2536
    Secondary· 3.7%
    #2e385f
    Secondary· 1.5%

    Business & Marketing Stack

    9 Tools Detected

    Enterprise

    CRM Systems

    1
    HubSpotMid-Market

    Customer Relationship Management platforms

    Customer Support

    1
    IntercomMid-Market

    Live chat and helpdesk tools

    Behavior Analytics

    4
    Google AnalyticsFree
    Microsoft ClarityFree
    AmplitudeMid-Market
    Google Tag ManagerFree

    User behavior and product analytics

    Scheduling

    1
    CalendlySMB

    Appointment and meeting schedulers

    Privacy & Cookies

    1
    CookiebotMid-Market

    Cookie consent and privacy compliance tools

    Social Media

    1
    Pinterest WidgetsFree

    Social widgets and sharing tools

    6

    Categories

    9

    Total Tools

    0

    Enterprise

    4

    Mid-Market

    Assessment: Sophisticated marketing and sales technology infrastructure

    Sponsored

    Scripts & Styles

    30 Resources

    20
    Scripts
    10
    Styles
    8
    Async
    10
    Defer

    Top Script Sources

    local(10)consent.cookiebot.com(2)widget.intercom.io(1)scripts.clarity.ms(1)js-eu1.hs-banner.com(1)

    Website Identity

    How Did Certifier Boost Brand Recognition? | Karolin Zeugträger (Impact Academy)

    How Did Certifier Boost Brand Recognition? | Karolin Zeugträger (Impact Academy)

    VideoObject

    In this testimonial, Karolin Zeugträger from Impact Academy shares how Certifier significantly boosted their brand recognition by simplifying the certificate generation process. Discover how Certifier\'s easy-to-use platform has transformed their workflow, making it efficient and time-saving. ------

    [email protected]
    certifier.io/
    5 years old

    Dolnych Młynów 3/1, Cracow

    31-124, Cracow, Małopolskie

    PL

    Location detected: 🇵🇱 Poland, Cracowvia schema_nap
    Cloudflare, Inc📧 Google WorkspaceenEst. 2020

    Sponsored

    Last analyzed: 17 May 2026 at 16:17

    Historical Analysis & Change Tracking

    certifier.io Technology Stack - Built With Next.js, GSAP, Lottie, Tailwind CSS, Ant Design | StackOptic | StackOptic