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

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.

About

Free of any frameworks, setups, configs, build steps, or packaging. Can be used with any framework or just with vanilla Javascript. Style it to your heart's content. Change font, logo, colors, and theme. Inject external HTML or embed it into another HTML document. Create beautiful, customizable, interactive API documentation from OpenAPI specification. Use It just like any other HTML tag, Change its attribute using JavaScript and see it react to those changes. Basic knowledge of HTML is all that's required. Minimal dependencies, no runtime, and no virtual DOM ensure the lowest memory consumption, Just the native and raw speed of modern browsers. Loved by tech writers, designers, dev-ops, testers, and developers alike, due to its simplicity, interoperability, and powerful features. No special build-steps, runtime, or framework are required. Comes with built-in console to Try out the APIs. Supports authentication mechanism. No validation ensures you can test negative cases.

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

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

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

Audience

Any user in search of a tool to create beautiful, customizable, interactive API documentation

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

Support

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

API

Offers API Not Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Screenshots and Videos

Pricing

$49 per month
Free Version Supported
Free Trial Not Supported

Pricing

Free
Free Version 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 Supported
In Person Not Supported

Company Information

Beyond Code
Founded: 2017
Germany
usehelo.com

Company Information

JavaScript
Founded: 1995
United States
javascript.com

Company Information

RapiDoc
United States
rapidocweb.com

Alternatives

Alternatives

Alternatives

Debug Mail

Debug Mail

DebugMail.io
5.0 out of 5 stars
AssemblyScript

AssemblyScript

The AssemblyScript Project
Minty Email Tester

Minty Email Tester

MintyEmailTester.com
5.0 out of 5 stars
ClickHelp

ClickHelp

5.0 out of 5 stars

Categories

Email Testing Supported

Categories

Categories

API Documentation Supported

Integrations

16x Prompt Not Supported
AI Fellows Not Supported
AiXcoder Not Supported
Blocksy Not Supported
D24 Not Supported
GPT-5 thinking Not Supported
GPT-5.5 Not Supported
Goose Not Supported
Grok 4.20 Not Supported
Kottster Not Supported
MetaMonster Not Supported
Mobiscroll Not Supported
Muse Spark 1.3 Not Supported
OpenAI o3-mini-high Not Supported
PaizaCloud Not Supported
Paperplane Not Supported
Tabnine Not Supported
Workflow Engine Not Supported
Zen Protocol Not Supported
pdfme Not Supported

Integrations

16x Prompt Supported
AI Fellows Supported
AiXcoder Supported
Blocksy Supported
D24 Supported
GPT-5 thinking Supported
GPT-5.5 Supported
Goose Supported
Grok 4.20 Supported
Kottster Supported
MetaMonster Supported
Mobiscroll Supported
Muse Spark 1.3 Supported
OpenAI o3-mini-high Supported
PaizaCloud Supported
Paperplane Supported
Tabnine Supported
Workflow Engine Supported
Zen Protocol Supported
pdfme Supported

Integrations

16x Prompt Not Supported
AI Fellows Not Supported
AiXcoder Not Supported
Blocksy Not Supported
D24 Not Supported
GPT-5 thinking Not Supported
GPT-5.5 Not Supported
Goose Not Supported
Grok 4.20 Not Supported
Kottster Not Supported
MetaMonster Not Supported
Mobiscroll Not Supported
Muse Spark 1.3 Not Supported
OpenAI o3-mini-high Not Supported
PaizaCloud Not Supported
Paperplane Not Supported
Tabnine Not Supported
Workflow Engine Not Supported
Zen Protocol Not Supported
pdfme Not Supported
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