vioscale
Comparison

Mailosaur vs MailSlurp

On the evidence we track, Mailosaur leads this comparison with a composite score of 61/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Mailosaur full profile →MailSlurp full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
★Mailosaur61
MailSlurp50
Score
Vioscale score
Mailosaur61 / 100medium · 55%
MailSlurp50 / 100medium · 54%
Pricing
Free tier
Mailosaur✗
MailSlurp✓
Model
Mailosaurcommercial
MailSlurpfreemium
Price level
Mailosaurmid
MailSlurplow
Starting price
Mailosaur$20
MailSlurp–
Transparent
Mailosaur✓
MailSlurp✗
Integrations
Count
Mailosaur20
MailSlurp8
Security
Disclosure policy
Mailosaur✓
MailSlurp–
Gdpr
Mailosaur✓
MailSlurp–
Iso27001
Mailosaur✓
MailSlurp–
Pci
Mailosaur✓
MailSlurp–
Soc2
Mailosaur–
MailSlurp✓
Market
Availability

Capabilities

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

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

What each one is

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

Mailosaur

Leader

Provides tools for validating emails and SMS messages through dedicated inboxes and phone numbers, with rendering previews across devices and email clients, integration into CI/CD pipelines, and automation via APIs and testing framework support.

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.

Mailosaur

Leader
from $20/moSubscription14-day trial

From $20/month (billed annually). Free 14-day trial.

  • Personal$20/month (billed annually)
    • Email compatibility testing
    • API for test automation
    • Forward emails to external addresses
  • Core$50/month (popular)
    • Team access
    • Multiple inboxes
    • Email accessibility testing
    • Mail rules
    • POP3/IMAP connectivity
    • +1 more
  • EnterpriseContact sales
    • Custom users and inboxes
    • SSO (SAML2/OIDC)
    • Separate permissions
    • Enterprise security
    • Account manager
    • +1 more
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
Mailosaur✓
MailSlurp✓
CLI
Mailosaur✓
MailSlurp✗
Deployment
Cloud / SaaS
Mailosaur✓
MailSlurp✓

Integrations

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

In common (1)
  • Playwright

Mailosaur

Leader
21 total - 20 not shared
  • Selenium
  • Cypress
  • TestCafe
  • WebdriverIO
  • Cucumber
  • Robot Framework
  • Ghost Inspector
  • Postman
  • Insomnia
  • PowerShell
  • Node.js
  • Java
  • Python
  • Ruby
  • .NET
  • PHP
  • Go
  • JavaScript
  • Okta
  • Microsoft Entra
Independently observed

MailSlurp

8 total - 7 not shared
  • Zapier
  • Gmail
  • Outlook
  • Dropbox
  • Google Drive
  • CypressJS
  • ACCELQ
Independently observed

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