Citadel-KZ
OPEN SOURCE
Open-source email client
About
Citadel-KZ is a free and open-source email client that offers features like tabbed email, advanced search, and support for add-ons and themes. It provides a lightweight and customizable email experience.
Pricing
Pricing Type
Open Source
Free tier available
Billing
One-time payment
Last checked: February 26, 2026
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Key Facts
Categories
Platforms
Mac
Windows
Linux
Company
Citadel-KZ
Founded
Founded in 1988
Country
Global
Language
English