ZapFast WhatsApp, native and fast

A lightweight WhatsApp app for Linux, macOS, and Windows. Chat, send voice messages, and share files.

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What is ZapFast?

GitHub

ZapFast showing a conversation with an attachment, voice messages, reactions, a quoted reply, and a link preview

⚡

Lightweight

Opens in under a second and uses about 200MB of RAM. No browser engine.

🦀

Native, in Rust

Built with egui and fastframe, the framework behind a family of native desktop apps. No browser engine inside.

🎤

Voice messages

Play, seek, and record voice messages in the chat. OGG/Opus support is built in.

🖼️

Attachments

Photos, GIFs, stickers, documents, polls, locations, and link previews appear in the chat. Add captions before sending files.

🔔

Background mode

Closing the window keeps ZapFast linked in the tray. Notifications show the chat picture, and muted chats stay quiet.

👥

Several numbers

Link more than one WhatsApp number and switch between them from your picture at the foot of the rail beside the chat list.

🎨

Themes

Light, dark, or the system’s appearance, custom colour themes, and on Omarchy your desktop theme.

Make a theme

⌨️

Keyboard shortcuts

Search, switch chats, reply, and record with shortcuts. Select and copy text, including across messages.

🔓

Open source

MIT-licensed Rust that links through whatsapp-rust. The linking process is documented.

Read the source

Want Spotify just as fast and native? Spotifast is ZapFast's sibling: the same native interface, for Spotify. Both are built on fastframe, the shared foundation for native Rust apps built with egui.