If you use Gmail but are not satisfied with the user interface Google Inbox may be the right alternative for you. It is a different interface for Gmail that is supposed to organize your email better and reduce the clutter in your mailbox. It is also more in line with Google’s new Material Design philosophy. Trying it does not affect your access to the traditional Gmail and you can easily use either service to access your email.
You can request an invite to use Google Inbox but you will have to download the Google Inbox app on your phone before you can get access to the web interface.