Kiwi provides a "native" feel for Gmail on your desktop. It turns the Gmail web interface into a standalone application, allowing you to open multiple accounts in separate windows just like traditional software. How to Choose the Right App
If you use more than just Gmail, Shift is a powerhouse. It creates a dedicated workstation where your Gmail accounts, Google Calendar, and Drive live side-by-side. It eliminates the need to constantly log in and out of different browser sessions. 2. Mailbird (Windows) multiple gmail accounts app download
The Ultimate Guide to Managing Multiple Gmail Accounts: Best Apps to Download Kiwi provides a "native" feel for Gmail on your desktop