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92 endpoints available across 10 categories

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WCAG 2.1/2.2 accessibility analysis across 24 checks

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Accessibility Audit

COMPLIANCE

Performs automated HTML-based accessibility analysis across 24 checks covering key WCAG 2.1 success criteria (also applicable to WCAG 2.2). Covers ARIA, semantic HTML, form labels, headings, images, language, navigation, viewport, media, tables, links, SVGs, and more. Automated checks cover approximately 63% of automatable WCAG 2.1 Level A/AA success criteria but cannot replace manual testing — areas like color contrast, keyboard navigation, and dynamic content require browser-based or manual evaluation. Returns a weighted score out of 100 with letter grade and actionable recommendations.

What it does

Analyzes the page across 24 accessibility checks: ARIA attributes and landmarks, semantic HTML elements, form input label associations (explicit, implicit, and aria-based), language attributes, heading hierarchy, image alt text presence and quality, skip navigation links, tab index misuse, generic link text, page title, viewport zoom restrictions, autoplay media, media captions, table accessibility, button accessible names, iframe titles, duplicate IDs, link accessible names, autocomplete attributes, meta refresh, SVG accessibility, fieldset/legend form groups, inline focus suppression, and object/embed/canvas alternatives.

Why it's useful

Web accessibility is both a legal requirement (ADA, WCAG) and a business imperative — it expands your audience and improves usability for everyone. Automated audits catch common issues at scale that manual testing would miss.

Common use cases

WCAG Compliance Check
Accessibility Specialist

Audit pages against WCAG 2.1/2.2 Level A and AA criteria to identify compliance gaps across 24 automated checks.

Benefit: Reduce legal risk and improve inclusivity for users with disabilities.

Development QA
Frontend Developer

Check new pages or components for accessibility regressions before deployment with detailed per-category scoring.

Benefit: Catch a11y regressions early in the development cycle with actionable recommendations.

Enterprise Compliance
Compliance Officer

Monitor accessibility compliance across all public-facing web properties with consistent scoring methodology.

Benefit: Track and report on accessibility progress across the organization with transparent, weighted scoring.

Scoring methodology24 checks / 100 pts

Each check maps to a WCAG 2.1 success criterion. The total score (0-100) determines the grade: A+ (95-100), A (85-94), B (70-84), C (50-69), D (30-49), F (0-29).

CheckWCAGLevelWeight
Semantic HTML

Usage of semantic elements (header, nav, main, footer, article, section)

1.3.1A10
Form Labels

Input label coverage via explicit, implicit, or ARIA labeling

1.3.1 / 4.1.2A10
Image Alt Text

Alt text presence (60%) and quality (40%) blended score

1.1.1A10
Heading Order

H1 presence, sequential hierarchy, no skipped levels

1.3.1 / 2.4.6A10
Language

Valid lang attribute on the html element

3.1.1A7
ARIA

ARIA landmark roles and attribute usage

4.1.2A6
Viewport Zoom

No user-scalable=no or maximum-scale < 2

1.4.4AA5
Skip Navigation

Skip-to-content link for keyboard navigation

2.4.1A4
Page Title

Descriptive title element present (generic titles like "Home" or "Untitled" receive partial credit)

2.4.2A4
Link Text

No generic link text (click here, read more, etc.)

2.4.4A3
Tab Index

No positive tabindex values (anti-pattern)

2.4.3A3
Link Accessibility

No empty or image-only links missing alt text

2.4.4 / 4.1.2A3
Autoplay Media

No unmuted autoplay audio or video

1.4.2A2
Media Captions

Captions/subtitles on video and audio elements

1.2.2A3
Tables

Caption, header cells, and scope on data tables

1.3.1A3
Duplicate IDs

Each id attribute must be unique (*SC 4.1.1 removed in WCAG 2.2 but duplicate IDs break ARIA/label associations)

4.1.1*A2
Autocomplete

Autocomplete on identifiable inputs (name, email, phone)

1.3.5AA2
Meta Refresh

No meta http-equiv=refresh redirect or reload

2.2.1A2
SVG Accessibility

Accessible names on non-decorative SVGs via title or aria-label

1.1.1A2
Form Groups

Fieldset and legend for radio/checkbox groups

1.3.1A2
Buttons

All buttons have accessible names

4.1.2A2
Focus Management

No inline outline:none suppressing focus indicators

2.4.7AA2
Iframes

Title attribute on all iframe elements

2.4.1A2
Media Alternatives

Alternative text for object, embed, and canvas elements

1.1.1A1
Total100

Related endpoints

API Path/v1/domain/accessibility
Required Tierdeveloper+

Available Endpoints

The playground provides access to 92 endpoints. Get an API key for full access to all features.

All

All available playground endpoints

  • Accessibility Audit
  • Analytics Detection
  • API CORS Check
  • API Version Detection
  • ASN Lookup
  • +85 more

DNS Records

Query, validate, and monitor DNS records

  • CAA Records
  • DNS Lookup
  • DNS Propagation
  • DNS Rebinding Check
  • DNSSEC Check
  • +7 more

Email Security

Protect email deliverability, prevent spoofing, and validate addresses

  • BIMI Check
  • DKIM Check
  • DMARC Check
  • Email Hosting
  • Email Score
  • +3 more

Website Security

Assess SSL certificates, security headers, and your site's attack surface

  • Certificate Chain
  • Cipher Suites
  • CT Logs
  • HSTS Check
  • OCSP Status
  • +5 more

SEO & Content

Optimize search rankings, audit content quality, and track authority

  • Canonical URL
  • Content Freshness
  • Core Web Vitals
  • Domain Authority
  • Favicon
  • +12 more

Tech Stack

Discover the technologies, frameworks, and infrastructure behind any website

  • Analytics Detection
  • API CORS Check
  • API Version Detection
  • CDN Detection
  • CMS Detection
  • +7 more

Site Performance

Analyze page speed, caching, compression, and delivery optimization

  • Cache Headers
  • Compression Check
  • HTTP Version
  • Page Weight
  • Performance Score
  • +3 more

Threat Intelligence

Detect malicious domains, suspicious IPs, and emerging threats

  • Bogon Check
  • Bogon Ranges
  • Domain Threat Check
  • IP Reputation
  • Privacy Detection
  • +2 more

Network & IP

IP geolocation, ASN lookups, and network diagnostics

  • ASN Lookup
  • ASN Prefixes
  • IP Geolocation
  • IP Range Info
  • IP WHOIS
  • +4 more

Compliance

WCAG accessibility, GDPR privacy, and regulatory compliance audits

  • Accessibility Audit
  • Compliance Score
  • Internationalization Check
  • Privacy Audit

Domain Reports

Comprehensive domain intelligence, health checks, and competitive analysis

  • Competitive Analysis
  • Domain Intelligence
  • Website Health

Example cURL Requests

Test the API from your terminal with these example commands.

DNS Lookup

curl -H "Authorization: Bearer YOUR_API_KEY" "https://api.edgedns.dev/v1/dns/lookup?domain=google.com&type=A"

Email Score

curl -H "Authorization: Bearer YOUR_API_KEY" "https://api.edgedns.dev/v1/score/email?domain=google.com"

Security Score

curl -H "Authorization: Bearer YOUR_API_KEY" "https://api.edgedns.dev/v1/score/security?domain=google.com"

Technology Detection

curl -H "Authorization: Bearer YOUR_API_KEY" "https://api.edgedns.dev/v1/domain/tech?domain=github.com"

DKIM Check

curl -H "Authorization: Bearer YOUR_API_KEY" "https://api.edgedns.dev/v1/security/dkim?domain=google.com"

IP Geolocation

curl -H "Authorization: Bearer YOUR_API_KEY" "https://api.edgedns.dev/v1/ip/geolocation?ip=8.8.8.8"

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