You should say:

　　what the app it is

　　what contents it has

　　how do you use it

　　and explain why you think this app is useful.

　　The App I would recommend is called Instapaper, which you can download from Apple Store.

　　Instapaper is one of those tools you didn’t know you needed until you use it. It’s my latest go-to tool for remembering and organizing what I want to read. I think this is useful coz I always find myself browsing the web and happening upon a story or two that I definitely want to read, but for whatever reason I just cannot read it at that particular moment. Most of this resort to saving it as a bookmark so you can read it later. But bookmarks are difficult to access on multiple computers.

　　Instapaper allows you to easily save them for later, when you do have time, so you don’t just forget about them or skim through them. While you’re browsing the web, when you find something you want to remember to read later to click a little icon in your web browser toolbar. That saves all of the text of the article. That’s Instapaper: the critically acclaimed, award-winning app to read web pages on the go, in the air, or on the couch.