HELOBeyond Code
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MailtrapRailsware
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Related Products
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About
HELO is a desktop application designed to simplify email testing and debugging for web developers by capturing and analyzing outgoing emails generated by applications during development. Instead of sending emails to real recipients, HELO exposes a local SMTP server that intercepts outgoing messages and displays them inside the application, allowing developers to inspect and verify them before deployment. This approach helps prevent common problems such as broken links, missing images, formatting errors, and other issues that often appear in production emails. It provides detailed debug views that show the email in multiple formats, including HTML rendering, plain text, raw source code, and full message headers, giving developers a complete understanding of how the message is structured. Automated validation tools check links within the email to confirm they return valid HTTP responses, reducing the risk of sending emails with invalid or broken URLs.
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About
Mailtrap is an email delivery platform for developers and product teams, providing a flexible RESTful API and SMTP service to send emails at scale. The platform is built 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. Developers can integrate quickly using SDKs for major languages (Python, Ruby, PHP, etc.) and manage high-volume sending with a customizable API. The platform provides industry-best analytics with helicopter-view dashboards to monitor key metrics and 30-day logs for easy debugging.
Trusted by over 150,000 monthly active users including Yelp, PayPal, Atlassian, and Adobe.
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
Web developers building applications that send transactional or automated emails and need a local tool to test, debug, and validate those emails before deployment
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Audience
Digital products’ dev and marketing teams that send high-volume emails with a focus on high deliverability.
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Screenshots and Videos |
Screenshots and Videos |
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Pricing
$49 per month
Free Version
Free Trial
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Pricing
$15/month
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationBeyond Code
Founded: 2017
Germany
usehelo.com
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Company InformationRailsware
Founded: 2007
United States
mailtrap.io
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Categories |
Categories |
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Email Testing Features
A/B Testing
Accessibility Testing
Deliverability Rates
DMARC Analytics
HTML Validation
Improvement Recommendations
IP Blacklist Checking
Pre-Send Email Testing
Preview Across Browsers & Devices
Reporting / Analytics
Sender Reputation Scoring
Spam Testing
Email Deliverability Features
Deliverability Alerts
Deliverability Reporting
DMARC Analytics
Email Address Verification
Email Content Testing
Email Previewing
Inbox Placement Testing
IP Blacklist Monitoring
Reputation Reporting
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Integrations
Bolt.new
Claude
Cursor
Elixir
HTML
Heroku
Laravel
Lovable
Node.js
PHP
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Integrations
Bolt.new
Claude
Cursor
Elixir
HTML
Heroku
Laravel
Lovable
Node.js
PHP
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