What are some alternatives?
When comparing Storybird and Archive of Our Own, you can also consider the following products
Storyboard That - Storyboard That is the world's best online storyboard creator.
Fanfiction.net - The most popular fan fiction website in the world according to Wikipedia
My Storybook - Make children's storybooks online for free.
Cowbird - Cowbird is a simple tool for telling stories, and a public library of human experience.
Little Bird Tales - Little Bird Tales: Capture the Voice of Childhood.
Unlimited Fan Fiction - Your ad-free fanfiction archive.