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What is Mailtrap?

Mailtrap is a modern email delivery platform for developer and product teams sending emails at scale. It provides a flexible RESTful API and SMTP service with a focus on high inboxing rates, fast delivery, and 24/7 technical support from deliverability experts. Mailtrap ensures 99.99% uptime with dedicated IPs, auto warm-up, and sender reputation protection through multi-tenant accounts. Quick integration is available via ready-to-use code snippets and SDKs for major programming languages, with 30-day access to email logs. Trusted by over 150,000 monthly active users, including Yelp, PayPal, Atlassian, and Adobe.

What is HELO?

HELO is a desktop application designed to simplify the process of email testing and debugging for web developers by capturing and analyzing emails generated during the application development stage. Instead of sending emails to real recipients, HELO includes a local SMTP server that intercepts outgoing messages and displays them within the application, allowing developers to inspect and verify the content prior to launch. This approach is essential for preventing common problems, such as broken links, missing images, and formatting errors, which may arise in live emails. The application provides detailed debugging views that illustrate the email in various formats—such as HTML display, plain text, raw source code, and full message headers—giving developers a thorough understanding of the email's architecture. Additionally, HELO implements automated validation tools to verify the links within the email, ensuring they return valid HTTP responses and significantly reducing the risk of distributing emails with invalid or broken URLs. By incorporating these capabilities, HELO not only streamlines the development process but also fosters greater confidence in the integrity of email communications before they are delivered to end users. Ultimately, this results in a more efficient workflow and enhances overall email quality, which is crucial in maintaining user engagement and satisfaction.

Media

Media

Integrations Supported

Bolt.new
Claude
Cursor
Elixir
HTML
Laravel
Lovable
Node.js
Python
Retool
Ruby
Ruby on Rails
Stripo.email
Symfony
Tabular
Vercel
Visual Studio Code
Windsurf Editor
n8n
v0

Integrations Supported

Bolt.new
Claude
Cursor
Elixir
HTML
Laravel
Lovable
Node.js
Python
Retool
Ruby
Ruby on Rails
Stripo.email
Symfony
Tabular
Vercel
Visual Studio Code
Windsurf Editor
n8n
v0

API Availability

Has API

API Availability

Has API

Pricing Information

$15/month
Free Trial Offered?
Free Version

Pricing Information

$49 per month
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Railsware

Date Founded

2007

Company Location

United States

Company Website

mailtrap.io

Company Facts

Organization Name

Beyond Code

Date Founded

2017

Company Location

Germany

Company Website

usehelo.com

Categories and Features

Email Deliverability

DMARC Analytics
Deliverability Alerts
Deliverability Reporting
Email Address Verification
Email Content Testing
Email Previewing
IP Blacklist Monitoring
Inbox Placement Testing
Reputation Reporting

Email Testing

A/B Testing
Accessibility Testing
DMARC Analytics
Deliverability Rates
HTML Validation
IP Blacklist Checking
Improvement Recommendations
Pre-Send Email Testing
Preview Across Browsers & Devices
Reporting / Analytics
Sender Reputation Scoring
Spam Testing

Categories and Features

Email Testing

A/B Testing
Accessibility Testing
DMARC Analytics
Deliverability Rates
HTML Validation
IP Blacklist Checking
Improvement Recommendations
Pre-Send Email Testing
Preview Across Browsers & Devices
Reporting / Analytics
Sender Reputation Scoring
Spam Testing

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