HELO

HELO

Beyond Code
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+

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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

charlymail is an email verification and lead data platform built for people who send at volume: cold outreach teams, affiliate marketers and lead-generation agencies. • VALIDATE — syntax, domain, MX records, role addresses, disposable domains, catch-all detection • SMTP — a deep check that opens a conversation with the receiving mail server and confirms the mailbox exists, without sending any message • ENRICH — name, gender, country, provider and corporate/personal classification • COLLECT — scrape addresses by niche from public sources Most services charge full price for every address in your file, including the obviously broken ones. charlymail splits the work. The first pass costs one token per address and filters out the junk. You then narrow the list by score, provider or country, and only that subset gets the expensive SMTP check. Addresses verified recently come back from cache for free.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

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

B2B

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

$49 per month
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

Reviews/Ratings

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

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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
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Beyond Code
Founded: 2017
Germany
usehelo.com

Company Information

charlymail
Founded: 2026
charlymail.com

Alternatives

Alternatives

Debug Mail

Debug Mail

DebugMail.io
Minty Email Tester

Minty Email Tester

MintyEmailTester.com
MailInput

MailInput

Devro LABS

Categories

Categories

Integrations

HTML

Integrations

HTML
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