vioscaleAI
Comparison

Email on Acid vs GreenMail

No clear leader: Email on Acid (57.7) and GreenMail (55.9) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Email on Acid full profile →GreenMail full profile →
Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
Email on Acid58
GreenMail56
Score
vioscaleAI score
Email on Acid58 / 100medium · 64%
GreenMail56 / 100low · 31%
Pricing
Free tier
Email on Acid✗
GreenMail✓
Model
Email on Acidcommercial
GreenMailopen_source
Price level
Email on Acidhigh
GreenMailfree
Starting price
Email on Acid$99
GreenMail–
Transparent
Email on Acid✓
GreenMail–
Security
Gdpr
Email on Acid✓
GreenMail–
Iso27001
Email on Acid✓
GreenMail–
Scorecard
Email on Acid–
GreenMail6.6
Soc2
Email on Acid✓
GreenMail–
Vulnerabilities
Reliability
Sla pct
Email on Acid99.9
GreenMail–
Adoption
Dependent repos
Email on Acid–
GreenMail2,587
Github stars
Email on Acid–
GreenMail747
Activity
Commits last 30d
Email on Acid–
GreenMail30
Release
Cadence days
Email on Acid–
GreenMail29
History
Email on Acid–
GreenMail20 items
License
Spdx
Email on Acid–
GreenMailApache-2.0
Language
Primary
Email on Acid–
GreenMailJava
Market
Availability
Email on AcidAvailable worldwide · Popular in US
GreenMail–
Content
Faq
Email on Acid6 items
GreenMail4 items

Capabilities

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

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

What each one is

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

Email on Acid

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

GreenMail

GreenMail is a lightweight testing tool that simulates SMTP, POP3, and IMAP email servers for application testing. It allows developers to extract, verify, and modify test messages within a contained environment while supporting SSL encryption.

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

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 ↗

GreenMail

Open sourceFree 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✓
GreenMail–
Deployment
Cloud / SaaS
Email on Acid✓
GreenMail✗
Self-hosted
Email on Acid✗
GreenMail✓
Still deciding?

Email on Acid or GreenMail: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

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