vioscale
Comparison

MailSlurp 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.

MailSlurp full profile →Testmail.app full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
MailSlurp50
★Testmail.app82
Score
Vioscale score
MailSlurp50 / 100medium · 54%updating
Testmail.app82 / 100low · 42%updating
Pricing
Free tier
MailSlurp✓
Testmail.app✓
Model
MailSlurpfreemium
Testmail.appfreemium
Price level
MailSlurplow
Testmail.applow
Starting price
MailSlurp–
Testmail.app$12
Transparent
MailSlurp✗
Testmail.app✓
Integrations
Count
MailSlurp8
Testmail.app3
Security
Gdpr
MailSlurp–
Testmail.app✓
Soc2
MailSlurp✓
Testmail.app–
Reliability
Sla pct
MailSlurp–
Testmail.app99.99
Status page
MailSlurp–
Testmail.app✓
Market
Availability

Capabilities

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

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

What each one is

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

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

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.

MailSlurp

Free 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
MailSlurp✓
Testmail.app✓
Deployment
Cloud / SaaS
MailSlurp✓
Testmail.app✓

Integrations

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

MailSlurp

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

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.