Software Alternatives, Accelerators & Startups

Zyntra App VS Smtp4dev

Compare Zyntra App VS Smtp4dev and see what are their differences

Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Zyntra App logo Zyntra App

Zyntra is a disposable email platform for QA teams and test automation workflows. It helps you capture, assert, and validate email content as part of your end-to-end tests — without manual setup or flaky workarounds.

Smtp4dev logo Smtp4dev

Smtp4dev is an all-in-one SMTP server designed to develop and test emails in your applications.
  • Zyntra App
    Image date //
    2025-04-25
  • Zyntra App
    Image date //
    2025-04-25
  • Zyntra App
    Image date //
    2025-04-25
  • Zyntra App
    Image date //
    2025-04-25
  • Zyntra App
    Image date //
    2025-04-25
  • Zyntra App
    Image date //
    2025-04-25

Zyntra is a disposable email platform for QA teams and test automation workflows.

It helps you capture, assert, and validate email content as part of your end-to-end tests — without manual setup or flaky workarounds.

Use it to:

• Generate unlimited private inboxes automatically, with one line of code
• Trigger real emails (OTP, password resets, invites) and read them via API or Web viewer
• Prevent test emails from leaking to real users — all inboxes are private by default
• Run isolated tests in CI/CD with no collisions or cleanup
• Validate your entire email-based flow, just like in production (real SMTP)

Zyntra works with any testing framework or language and includes an official Node.js SDK for fast integration. Ephemeral inboxes are retained for 24 hours; persistent ones for at least 7 days.

Built by QA, for QA — Zyntra helps you stop babysitting test environments and focus on verifying what matters.

  • Smtp4dev Landing page
    Landing page //
    2023-09-24

Zyntra App

Website
zyntra.app
$ Details
freemium $9.0 / Monthly (10000 e-mails)
Release Date
2025 March
Startup details
Country
Ukraine
Employees
1 - 9

Smtp4dev

Website
github.com
Pricing URL
-
$ Details
-
Release Date
-

Zyntra App features and specs

No features have been listed yet.

Smtp4dev features and specs

  • Open Source
    SMTP4dev is open-source, allowing developers to access, modify, and contribute to the code. This promotes community collaboration and transparency.
  • Local Testing
    Provides an easy way to test emails locally without the need to send messages through external servers, which can speed up development and debugging.
  • Cross-Platform
    Compatible with multiple operating systems (Windows, macOS, Linux), making it versatile for developers using different environments.
  • Web Interface
    Features a user-friendly web interface for viewing and managing received emails, simplifying the process for users to interact with the tool.
  • No Configuration Needed
    Runs with minimal configuration, enabling easy setup and use for developers who need a quick solution.

Possible disadvantages of Smtp4dev

  • Limited Features
    Lacks advanced email testing features such as spam score analysis or integration with CI/CD pipelines, which could be needed for more comprehensive testing.
  • Not Suitable for Production
    Designed for local testing and is not intended to be used as a production mail server, limiting its use case to development environments only.
  • Security Concerns
    Running an SMTP server locally might pose security risks if not properly managed, especially when testing with real data.
  • Dependency Management
    Since it's a third-party tool, it can require management of dependencies and regular updates to ensure compatibility with existing workflows.

Zyntra App videos

No Zyntra App videos yet. You could help us improve this page by suggesting one.

Add video

Smtp4dev videos

Sending Email with SMTP4Dev and MailKit (#210)

More videos:

  • Review - send email to localhost using smtp4dev and view in outlook

Category Popularity

0-100% (relative to Zyntra App and Smtp4dev)
Email
48 48%
52% 52
Email Testing
0 0%
100% 100
APIs
100 100%
0% 0
Office Suites
0 0%
100% 100

User comments

Share your experience with using Zyntra App and Smtp4dev. For example, how are they different and which one is better?
Log in or Post with

Social recommendations and mentions

Based on our record, Smtp4dev seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Zyntra App mentions (0)

We have not tracked any mentions of Zyntra App yet. Tracking of Zyntra App recommendations started around Apr 2025.

Smtp4dev mentions (2)

  • How do you guys write end to end test which will trigger a mailer endpoint?
    Depends on the infrastructre setup, but if you're able to specify smtp server the backend will use you can you something like https://github.com/mailhog/MailHog or https://github.com/rnwood/smtp4dev to catch any sent email, regardless of email address and read it via the respective api. Both mailhog and smtp4dev have decent api documentation. Source: over 2 years ago
  • Make smtp server
    If so you could check out smtp4dev, it gives you a locally hosted client that you can use to intercept any mail send out by your app and displays them in a nice web based gui interface so can see what they look like. Source: almost 3 years ago

What are some alternatives?

When comparing Zyntra App and Smtp4dev, you can also consider the following products

Mailosaur - Email Testing for QA & Development Teams.

Mailtrap - Email Delivery Platform that delivers just in time.
 Great for businesses and individuals.

Mailinator - Any Inbox. Any Time.

MailHog - MailHog is an email testing tool inspired by MailCatcher, but easier to install.

FakeSMTP - FakeSMTP is a Free Fake SMTP Server with GUI for testing emails in applications easily.

testmail.app - QA tool for automating end-to-end email tests. Get unlimited private email addresses and inboxes for testing new user signups, transactional emails and drip campaigns, deliverability and spam scores, etc.