The official Gmail app for iOS is designed to give you the complete Google Mail experience on your mobile, adding a number of features that are not available through the native iOS Mail app.
Features of the Gmail application include the ability to read mails with threaded conversations, as well as quick organization of mails by archiving, labeling, starring, deleting and reporting as spam. The Gmail app makes it very easy to search through all of your inbox, and allows you to add attachments to emails - something that the iOS Mail app sadly lacks.
Those of you who have used the Gmail web app in Safari will be instantly familiar with the layout of the app. Essentially it's the same design and functionality packaged into app format. This feels a bit disappointing given that Google could've created a unique native app.
That said, there are a few features of the Gmail app are different to the web app version. There's a slide-out side panel that allows you to browse through mail folders, labels and previous chats. Annoyingly, you can't scroll through messages or email lists while this side panel is open.
Of course, the Gmail app is also different from the mobile web version in that it alerts you to new email without you having to open the application. It does this through notifications and badges on the app icon.
There's lots of room for improvement within the Gmail app. For example, it still doesn't support multiple accounts, and accessing mail feels sluggish at times.
Gmail users should install this official app to get more features than are available in iOS Mail at the moment. However, the Gmail app still needs a few improvements.