Shortly is an iOS and Android app that pulls top-rated stories from Reddit’s /r/writingprompts community. Pulling from the best of the community’s short stories usually means you’ll read interesting takes on prompts like “You’re a killer dumping your latest victim into the river. Just as you’re about to be done, you spot another person. Doing exactly the same thing. And they’ve just spotted you, too.”
When you open Shortly, you can choose between a one, three, or five-minute story from the community, and you’ll be able to see the story’s writing prompt along with the story itself.
I use Pocket for my non-fiction stuff but this is a great way to get quick hits of some very good fiction.