What are some alternatives?
When comparing Storybird and Wattpad, you can also consider the following products
My Storybook - Make children's storybooks online for free.
Commaful - Largest multimedia fiction site in the world. A lot of short stories, poetry, and fanfiction.
Storyboard That - Storyboard That is the world's best online storyboard creator.
Penana - Read the best stories from our aspiring writers! Come in to interact with writers and other fans!
Fanfiction.net - The most popular fan fiction website in the world according to Wikipedia
Cowbird - Cowbird is a simple tool for telling stories, and a public library of human experience.