Altus is described as 'Cross-platform desktop WhatsApp client with themes, multiple account support and much more!' and is an app. There are four alternatives to Altus for Linux, Flathub, Mac and Windows. The best Altus alternative is Whatsie, which is both free and Open Source. Other great apps like Altus are ZapZap, WhatsApp Desktop and Whakarere.
Feature rich WhatsApp web client based on Qt WebEngine for Linux Desktop
Whatsie Key features
Light and Dark Themes with automatic switching Customized Notifications & Native Notifications Keyboard Shortcuts BuiltIn download manager Mute Audio, Disable N.
Unofficial whatsapp web desktop client for OSX, Linux and Windows. Build with Electron.
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