Ferdium is a community fork of Franz. The Catalina-compatible version ( 6.4.1 ) works flawlessly. It allows you to run WhatsApp Web plus Messenger, Telegram, and Slack in one window—saving RAM on an older Mac.
Google Chrome (latest Catalina version) + web.whatsapp.com pinned to your Dock (click the ··· in Chrome → More tools → Create shortcut → Open as window). This mimics a native app and reliably supports QR linking, notifications, and stickers.
| Feature | WhatsApp Web (via Browser) | WhatsApp Web (as "Install App") | | :--- | :--- | :--- | | | None, runs in a browser tab. | "Install Page as App" in Chrome creates a standalone window. | | Performance | Can be slower and memory-intensive if many tabs are open. | Often feels faster and more stable because it runs as a dedicated process. | | Notifications | Works, but depends on the browser staying open. | Usually more reliable, with its own Dock icon and notifications. | | Calls (Voice/Video) | Fully supported, works best on Chrome, Edge, Firefox, and Safari. | Same as WhatsApp Web. | | Keyboard Shortcuts | Limited to standard browser shortcuts. | More robust system integration, but still mirroring the web client. | | Offline/Background | Phone no longer needs to be online, but the browser tab must be open. | Same as WhatsApp Web, but in its own window. | | Best for Catalina | A reliable primary method. | The preferred method for an app-like experience without compatibility issues. | whatsapp web mac os 10.15.7
One common question is how to keep using efficiently on this specific version of macOS. Since WhatsApp recently updated its desktop architecture, the "Desktop App" experience has changed. Here is everything you need to know about running WhatsApp on macOS 10.15.7. 1. The Browser Method (WhatsApp Web)
Safari 15 on Catalina works, but with caveats. You may encounter a "Your browser is not supported" warning. If so: Ferdium is a community fork of Franz
To use WhatsApp on your Mac without installing the incompatible app, follow these steps: How to Use WhatsApp on Mac 10.15.7 - Expert Q&A
: You can enable browser notifications so you receive banners and sounds in the macOS Notification Center, even when you aren't looking at the browser. Google Chrome (latest Catalina version) + web
Many users assume the web version is a stripped-down experience, but modern WhatsApp Web is incredibly powerful. Here are the core features you can use on your Catalina Mac: