
Nessus
AlienVault USM (from AT&T Cybersecurity)
Tenable.io
BoxCryptor
Mega
Google Drive
Cryptomator
Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.

Thunderbird
Mailbird
eM Client
Microsoft Outlook
Apple Mail
ProtonMail
Mailspring
The Power Email App for busy professionals, like you.

Website, pricing, platforms and company facts side by side.
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| Website | qualys.com | postbox-inc.com |
| Pricing | ||
| Company | Startup from the United States | — |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Qualys is recommended for businesses of all sizes that need a cloud-based, scalable, and comprehensive security solution. It's particularly beneficial for organizations that require vulnerability management, compliance monitoring, and those operating in highly regulated industries where security is paramount.
Overall verdict
Why this product is good
Recommended for
Postbox is recommended for power users, professionals, and businesses that require advanced email organization features, customizability, and integration with other productivity tools.
Walkthroughs and reviews on video.
Qualys Review by SecNetlab
More videos
App Pick of the Week: Postbox
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Qualys and Postbox. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Qualys Container Security is one of 21 applications that fall under the Qualys Cloud Platform umbrella. The Cloud Platform is available for the cloud and on-premises container deployments. Qualys’ Container Runtime...
Qualys is a cloud-based application security scanner that is known for its ability to crawl every corner of your IT network’s portfolio to detect all types of web assets. It grants users full 24/7 visibility of their...
Qualys is a cloud platform that continuously detects and protects against attacks anytime, anywhere. It is next-generation vulnerability management for hybrid IT environments. Qualys’ integrated approach to IT...
Postbox is a tool that helps you to add dynamic data fields to responses and templates. It allows you to reuse HTML snippet within message replies. This Outlook mail client alternative app provides more than 25 design...
Outlook, an email client with a similar Microsoft interface and similar features to Thunderbird, should be considered by anyone using Microsoft Office. Many power users like PostBox for Windows and Mac, MailMate for...
Next up, on our list of the best Thunderbird alternatives, we have PostBox. It is accessible for Windows and Mac. It offers some advanced features as you can point out particular folders as favorites for quick action.
When comparing Qualys and Postbox, you can also consider the following products.

Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
Compare Nessus to Qualys or Postbox:

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Compare Thunderbird to Qualys or Postbox:

AlienVault USM Anywhere delivers powerful threat detection, incident response, and compliance management for cloud, on-premises, and hybrid environments.
Compare AlienVault USM (from AT&T Cybersecurity) to Qualys or Postbox:

Mailbird is the best email client for Windows 7, 8 and 10
Compare Mailbird to Qualys or Postbox:

Tenable.io Cyber Exposure platform helps to protect any asset on any computing platform and eliminate blind spots.
Compare Tenable.io to Qualys or Postbox:

eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
Compare eM Client to Qualys or Postbox: