Hey Product Hunt! If you've spent any time with character chat apps, you've probably noticed the same thing I did: the story is on rails. Same opener, same beats, same ending — and the moment a session ends, the character is locked into that one universe. You can't cast them into a different story tomorrow. casto opens both of those up. Build your characters once, then drop them into whatever premise you sketch out. An AI screenwriter takes it from there and writes a 5-episode serialized story around the cast you chose. After every chapter you pick what happens next, so the plot bends to your twists instead of a fixed route. And the same character can be cast into a different story whenever you want — your universe just keeps expanding. A few things I'd love feedback on: - Does the "casting" metaphor click for you, or feel forced? - 5 episodes per story — too short, just right, too long? - What character traits do you wish you could define? casto is live on iOS and Android, in 6 languages (English, Korean, Japanese, German, French, Traditional Chinese). Free daily generations + a soft in-app currency ("popcorn") for higher-quality runs. Happy to dig into anything in the thread. Thanks for taking a look!

Casto

Cast your characters in your own AI-written stories

Cast your characters in your own AI-written stories