HELO

HELO

Beyond Code
+

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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.

About

HTML Email Check includes all the tools developers need to create, check and validate their HTML emails with, including instant validation results, an integrated HTML editor, layout viewer, and email sending. Validation of the HTML markup, structure, and client-specific tags. Validation of CSS formatting, inline CSS, and client-specific styling. Validation of font types, web fonts, and client-specific styling. Checking of image sources, dimensions, and attributes. Checking for working URL's, special links, and attributes. Layout and HTML structure testing on non client-specific devices. Send up to 10 test emails at a time directly to your inbox. Covering important aspects your email should include before sending. Every day is different and sometimes you need to react quickly to a certain situation or last-minute changes.

About

JavaScript is a scripting language and programming language for the web that enables developers to build dynamic elements on the web. Over 97% of the websites in the world use client-side JavaScript. JavaScript is one of the most important scripting languages on the web. Strings in JavaScript are contained within a pair of either single quotation marks '' or double quotation marks "". Both quotes represent Strings but be sure to choose one and STICK WITH IT. If you start with a single quote, you need to end with a single quote. There are pros and cons to using both IE single quotes tend to make it easier to write HTML within Javascript as you don’t have to escape the line with a double quote. Let’s say you’re trying to use quotation marks inside a string. You’ll need to use opposite quotation marks inside and outside of JavaScript single or double quotes.

Platforms Supported

Windows Not Supported
Mac Supported
Linux Not Supported
Cloud Not Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Supported

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

Audience

Developers looking for a solution that helps create, check and validate their HTML emails

Audience

Web developers and anyone looking for a mobile solution for running and developing web content

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

API

Offers API Not Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Screenshots and Videos

Pricing

$49 per month
Free Version Supported
Free Trial Not Supported

Pricing

$14.95 per month
Free Version Not Supported
Free Trial Not Supported

Pricing

Free
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Beyond Code
Founded: 2017
Germany
usehelo.com

Company Information

HTML Email Check
Founded: 2016
Germany
www.htmlemailcheck.com

Company Information

JavaScript
Founded: 1995
United States
javascript.com

Alternatives

Alternatives

Minty Email Tester

Minty Email Tester

MintyEmailTester.com
5.0 out of 5 stars

Alternatives

Debug Mail

Debug Mail

DebugMail.io
5.0 out of 5 stars
PilotMail

PilotMail

Netling Digital
AssemblyScript

AssemblyScript

The AssemblyScript Project
Minty Email Tester

Minty Email Tester

MintyEmailTester.com
5.0 out of 5 stars
HELO

HELO

Beyond Code
PutsMail

PutsMail

Litmus

Categories

Email Testing Supported

Categories

Email Testing Supported

Categories

Integrations

Appier AIRIS Not Supported
Claude Opus 4.8 Not Supported
DataGrip Not Supported
Eclipse Che Not Supported
Falcon Mamba 7B Not Supported
GPT-5 nano Not Supported
GPT-5.3 Instant Not Supported
Halo Security Not Supported
Kitto Not Supported
Nightwatch.js Not Supported
Nova Not Supported
OpenAI o1-mini Not Supported
OrbitDB Not Supported
Scrape.do Not Supported
Sider Scan Not Supported
SmartBear AQTime Pro Not Supported
SnippetsLab Not Supported
WizyChat Not Supported
ZenRows Not Supported
Zuar Portal Not Supported

Integrations

Appier AIRIS Not Supported
Claude Opus 4.8 Not Supported
DataGrip Not Supported
Eclipse Che Not Supported
Falcon Mamba 7B Not Supported
GPT-5 nano Not Supported
GPT-5.3 Instant Not Supported
Halo Security Not Supported
Kitto Not Supported
Nightwatch.js Not Supported
Nova Not Supported
OpenAI o1-mini Not Supported
OrbitDB Not Supported
Scrape.do Not Supported
Sider Scan Not Supported
SmartBear AQTime Pro Not Supported
SnippetsLab Not Supported
WizyChat Not Supported
ZenRows Not Supported
Zuar Portal Not Supported

Integrations

Appier AIRIS Supported
Claude Opus 4.8 Supported
DataGrip Supported
Eclipse Che Supported
Falcon Mamba 7B Supported
GPT-5 nano Supported
GPT-5.3 Instant Supported
Halo Security Supported
Kitto Supported
Nightwatch.js Supported
Nova Supported
OpenAI o1-mini Supported
OrbitDB Supported
Scrape.do Supported
Sider Scan Supported
SmartBear AQTime Pro Supported
SnippetsLab Supported
WizyChat Supported
ZenRows Supported
Zuar Portal Supported
Claim HELO and update features and information
Claim HELO and update features and information
Claim HTML Email Check and update features and information
Claim HTML Email Check and update features and information
Claim JavaScript and update features and information
Claim JavaScript and update features and information