vioscale
Comparison

GreenMail vs Testmail.app

On the evidence we track, Testmail.app leads this comparison with a composite score of 82/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

GreenMail full profile →Testmail.app full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
GreenMail58
★Testmail.app82
Score
Vioscale score
GreenMail58 / 100low · 31%
Testmail.app82 / 100low · 42%
Pricing
Free tier
GreenMail✓
Testmail.app✓
Model
GreenMailcommercial
Testmail.appfreemium
Price level
GreenMailfree
Testmail.applow
Starting price
GreenMail–
Testmail.app$12
Transparent
GreenMail–
Testmail.app✓
Integrations
Count
GreenMail–
Testmail.app3
Security
Gdpr
GreenMail–
Testmail.app✓
Scorecard
GreenMail6.4
Testmail.app–
Vulnerabilities
Reliability
Sla pct
GreenMail–
Testmail.app99.99
Status page
GreenMail–
Testmail.app✓
Adoption
Dependent repos
GreenMail2,587
Testmail.app–
Github stars
GreenMail740
Testmail.app–
Activity
Commits last 30d
GreenMail28
Testmail.app–
Release
Cadence days
GreenMail43
Testmail.app–
History
GreenMail20 items
Testmail.app–
License
Spdx
GreenMailApache-2.0
Testmail.app–
Language
Primary
GreenMailJava
Testmail.app–
Market
Availability

Capabilities

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

Capabilities
API assertions
GreenMail✓
Testmail.app-
Rendering preview
GreenMail✗
Testmail.app-
Spam score check
GreenMail✗
Testmail.app-
Blocklist deliverability check
GreenMail✗
Testmail.app-
SMS testing
GreenMail✗
Testmail.app-
Production sending addon
GreenMail✗
Testmail.app-
Ci cd integration
GreenMail✓
Testmail.app-
Multi user inboxes
GreenMail✓
Testmail.app-
Open source
GreenMail✓
Testmail.app-

What each one is

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

GreenMail

A testing framework that emulates email server behavior (SMTP, POP3, IMAP) to help developers verify email functionality in their applications during testing, without requiring actual email infrastructure or sending real messages.

Independently observed

Testmail.app

Leader

Provides temporary, addressable mailboxes and APIs enabling developers to capture and verify emails in automated test workflows and CI/CD pipelines without contacting real users.

Independently observed

Pricing

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

GreenMail

Open sourceFree tier
as of verify ↗

Testmail.app

Leader
from $12/moSubscriptionFree tier14-day trial

From free to $299/month. Free tier with 100 emails/month. 14-day trial.

  • FreeFree
    • 100 emails/month
    • Unlimited users, email addresses, and mailboxes
  • Essential$12/month or $9/month billed annually
    • 10,000 emails/month
    • Full API access
  • Pro$39/month or $29/month billed annually
    • 50,000 emails/month
    • Unlimited custom namespaces
    • Visual email viewer
    • Priority support
  • Enterprise$129/month or $89/month billed annually
    • 1,000,000 emails/month
    • SSO with SAML 2.0 or OIDC
    • SCIM support
    • Enterprise invoicing
    • 99.99% uptime SLA
  • Unlimited$299/month or $269/month billed annually
    • 10,000,000 emails/month
    • All Enterprise features
    • Unlimited custom domains
    • Custom contracts with enterprise compliance support
as of verify ↗

Platform & deployment

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

Platforms
Web
GreenMail–
Testmail.app✓
Deployment
Cloud / SaaS
GreenMail✗
Testmail.app✓
Self-hosted
GreenMail✓
Testmail.app✗

Integrations

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

GreenMail

Not documented yet.

Testmail.app

Leader
3 total
  • Microsoft Entra ID
  • Okta
  • OneLogin
Independently observed

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