name: Email on Acid
description: Email on Acid (now branded as Mailgun Inspect) is an email testing and
  pre-deployment quality assurance platform with a REST API for rendering email previews
  across 100+ email clients and devices, checking accessibility compliance (WCAG 2.2),
  validating HTML/CSS compatibility, running spam filter analysis, and automating
  pre-send email testing workflows via HTTP Basic Authentication.
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
url: https://raw.githubusercontent.com/api-evangelist/email-on-acid/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
aid: email-on-acid
type: Index
tags:
  - Email Testing
  - Email Previews
  - Email Clients
  - Spam Testing
  - Accessibility
  - HTML Validation
  - Email Quality Assurance
  - Pre-Deployment Testing
apis:
  - name: Email on Acid API
    description: REST API for automating email testing across 100+ email clients and
      devices, including email rendering previews, spam filter testing, seed list
      management, and accessibility checks. Supports sandbox mode for development
      and test result storage for 90 days.
    image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    humanURL: https://api.emailonacid.com/docs/latest
    baseURL: https://api.emailonacid.com/v5
    tags:
      - Email Testing
      - Email Previews
      - Spam Testing
      - Email Clients
      - Rendering
    properties:
      - type: Documentation
        url: https://api.emailonacid.com/docs/latest
      - type: OpenAPI
        url: https://raw.githubusercontent.com/api-evangelist/email-on-acid/refs/heads/main/openapi/email-on-acid-openapi.yml
    contact:
      - FN: Email on Acid Support
        url: https://www.emailonacid.com/contact/
common:
  - type: Website
    url: https://www.emailonacid.com
  - type: Documentation
    url: https://api.emailonacid.com/docs/latest
  - type: GitHubOrg
    url: https://github.com/emailonacid
  - type: LinkedIn
    url: https://www.linkedin.com/company/email-on-acid
  - type: Blog
    url: https://www.emailonacid.com/blog/
  - type: Pricing
    url: https://www.emailonacid.com/pricing/
  - type: StatusPage
    url: https://status.emailonacid.com/
  - type: X
    url: https://twitter.com/EmailOnAcid
  - type: Plans
    url: plans/email-on-acid-plans-pricing.yml
  - type: RateLimits
    url: rate-limits/email-on-acid-rate-limits.yml
  - type: FinOps
    url: finops/email-on-acid-finops.yml
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com