vioscale
Comparison

Email on Acid vs MailSlurp

On the evidence we track, Email on Acid leads this comparison with a composite score of 58/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Email on Acid full profile →MailSlurp full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
★Email on Acid58
MailSlurp50
Score
Vioscale score
Email on Acid58 / 100medium · 66%updating
MailSlurp50 / 100medium · 54%updating
Pricing
Free tier
Email on Acid✗
MailSlurp✓
Model
Email on Acidcommercial
MailSlurpfreemium
Price level
Email on Acidhigh
MailSlurplow
Starting price
Email on Acid$99
MailSlurp–
Transparent
Email on Acid✓
MailSlurp✗
Integrations
Count
Email on Acid–
MailSlurp8
Security
Gdpr
Email on Acid✓
MailSlurp–
Iso27001
Email on Acid✓
MailSlurp–
Soc2
Email on Acid✓
MailSlurp✓
Reliability
Sla pct
Email on Acid99.9
MailSlurp–
Market
Availability
Email on AcidAvailable worldwide · Popular in US
MailSlurp–

Capabilities

Feature-by-feature on the axes that matter for email testing dev. “-” means undocumented, not absent.

Capabilities
API assertions
Email on Acid✓
MailSlurp✓
Rendering preview
Email on Acid✓
MailSlurp✓
Spam score check
Email on Acid✓
MailSlurp✓
Blocklist deliverability check
Email on Acid✓
MailSlurp✓
SMS testing
Email on Acid✗
MailSlurp✓
Production sending addon
Email on Acid✗
MailSlurp✓
Ci cd integration
Email on Acid✗
MailSlurp✓
Multi user inboxes
Email on Acid✗
MailSlurp✓
Open source
Email on Acid✗
MailSlurp✗

What each one is

The product in its own terms, so the numbers below have context.

Email on Acid

Leader

Tests email campaigns across 100+ email clients and devices to identify rendering issues, validate content for inbox compatibility, check accessibility compliance, and detect deliverability problems before sending.

Independently observed

MailSlurp

A testing and automation platform providing real email inboxes and phone numbers via APIs and SDKs, enabling developers to verify email flows, OTP delivery, and message behavior in automated tests and CI/CD pipelines.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Email on Acid

Leader
from $99/moSubscription7-day trial

From $99/month. 7-day free trial.

  • Basic$99/month, $0.15 per preview overage
    • 1,000 email previews per month
    • 100+ email preview clients and devices
    • Unlimited users
    • API access
    • Overage charges for additional previews
  • Premium$199/month
    • 2,000 email previews per month
    • 100+ email preview clients and devices
    • Unlimited users
    • Accessibility tests (WCAG 2.2 / European Accessibility Act compliance)
    • HTML code analysis
    • +2 more
  • CustomContact sales
    • Custom preview allotments
    • Phone and chat support
    • Dedicated support documentation
as of verify ↗

MailSlurp

Free tier
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Email on Acid✓
MailSlurp✓
Deployment
Cloud / SaaS
Email on Acid✓
MailSlurp✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

Email on Acid

Leader

Not documented yet.

MailSlurp

8 total
  • Zapier
  • Gmail
  • Outlook
  • Dropbox
  • Google Drive
  • Playwright
  • CypressJS
  • ACCELQ
Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.