vioscale
Comparison

Maildev vs Mailosaur

No leader: the top candidate Maildev has only 0.24 confidence (low), below the 0.35 needed to declare a winner. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Maildev full profile →Mailosaur full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
Maildev64
Mailosaur61
Score
Vioscale score
Maildev64 / 100low · 24%
Mailosaur61 / 100medium · 55%
Pricing
Free tier
Maildev✓
Mailosaur✗
Model
Maildevcommercial
Mailosaurcommercial
Price level
Maildevfree
Mailosaurmid
Starting price
Maildev–
Mailosaur$20
Transparent
Maildev✓
Mailosaur✓
Integrations
Count
Maildev–
Mailosaur20
Security
Disclosure policy
Maildev–
Mailosaur✓
Gdpr
Maildev–
Mailosaur✓
Iso27001
Maildev–
Mailosaur✓
Pci
Maildev–
Mailosaur✓
Scorecard
Maildev4.6
Mailosaur–
Vulnerabilities
Adoption
Dependent repos
Maildev313
Mailosaur–
Github stars
Maildev6,032
Mailosaur–
Activity
Commits last 30d
Maildev24
Mailosaur–
Release
Cadence days
Maildev46
Mailosaur–
History
Maildev20 items
Mailosaur–
License
Spdx
MaildevMIT
Mailosaur–
Language
Primary
MaildevTypeScript
Mailosaur–
Market
Availability

Capabilities

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

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

What each one is

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

Maildev

Runs as a local SMTP server with a web inbox interface to capture and review emails generated by your application during development. Supports AI agent integration through the Model Context Protocol for automated email inspection.

Independently observed

Mailosaur

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

Pricing

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

Maildev

FreeFree tier

Free & open source (MIT)

as of verify ↗

Mailosaur

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 ↗

Platform & deployment

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

Platforms
Web
Maildev✓
Mailosaur✓
CLI
Maildev✓
Mailosaur✓
Deployment
Cloud / SaaS
Maildev✗
Mailosaur✓
Self-hosted
Maildev✓
Mailosaur✗

Integrations

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

Maildev

Not documented yet.

Mailosaur

21 total
  • Selenium
  • Playwright
  • 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

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