Lots of users of the world love and picked Viewer for Gmail for their stand-alone gmail client. Thank you! Viewer for Gmail is a Mac version email client for Gmail with fancy iPad UI or Inbox UI or desktop UI. You don't need to open your web browser any more. If you're heavy web user with multiple tabs, it causes slow user experience in some cases. But Viewer for Gmail is a stand-alone application, so you don't worry about web browser's slowness.
* Mail notification (sound, banner, dock, badge) is supported.
* Viewer for Gmail is a 3rd party application for Gmail.