Apps similar to ZapFast include WhatsApp, which has a free version. Other options are Whatsie, WaEnhancer, Tinode and ZapZap. You can choose from more than 10 Instant Messengers like ZapFast for Linux, Android, the web, Mac and Windows.
Exchange messages without SMS fees using this app for iPhone, Android and desktop, featuring group chats, multimedia sharing, and video calls. The app requires an internet connection and the latest version for optimal functionality.
United States
Whatsie is a native Linux desktop wrapper for WhatsApp Web, built on Qt and QtWebEngine. It brings WhatsApp out of the browser tab and into a proper desktop application with system integration, privacy controls, and customization options unavailable in a plain browser.
India
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Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line administration tool in python + gRPC. Clients for Android, iPhone, and Web - ReactJS (all licensed under Apache 2.0).
United States
Unofficial whatsapp web desktop client for OSX, Linux and Windows. Build with Electron.
Never ever miss a WhatsApp notification again while you are on your desktop computer. This extension makes it possible to receive WhatsApp notifications even when there is no WhatsApp tab or Chrome window at all open.
WhatsDesk is a unofficial client of Whatsapp. This project only insert a web whatsapp in a electron app and add desktop notification
Messenger for WhatsApp™ (WA Messenger) is a wrapper for WhatsApp Web. It loads WhatsApp Web in toolbar popup UI and has badge icon text notification for all new conversations (even if toolbar popup is closed).
Germany
EU
Karere is a native GTK4 application that provides a seamless WhatsApp web experience integrated with your Linux desktop. Built with modern technologies like Libadwaita, Blueprint UI, and WebKitGTK 6.0, it offers a clean, responsive interface that follows GNOME design principles.
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