# CollideAI > AI roleplay for Android. You bring a world and a character, the AI plays > everything else and remembers what you built. Free to download. CollideAI is an AI roleplay chat app. You create characters and a setting, then play in one of two modes. There is no fixed script and no intended path: the story goes wherever your choices take it. ## Modes - **Story mode**: you control one character. The AI narrates everyone else, allies, enemies and bystanders, along with timing, terrain and what your choices cost you. Any moment can be captured as a picture. - **Texting mode**: no prose and no narrator, just an SMS-style thread with one character who writes the way they talk and sends photos that match how they have looked all along. ## What it does - **Memory that holds**: backstory is locked, current state (injuries, moods, who is speaking to whom) updates as you play. It still tracks two hundred messages in. - **Rewind any moment**: delete a message and everything after it goes too, including what the AI learned from it, so you can take the other branch from a clean state. - **Canon worlds or your own**: start in an established setting and it already knows the rules, or describe something new and it builds outward from what you give it. Popular starting points include Attack on Titan, Demon Slayer, Jujutsu Kaisen, My Hero Academia, Naruto and One Piece. - **Pictures**: turn any scene into an image, and receive photos from characters while texting. - **Everything is a switch**: photos, text effects and sound each toggle off, so it runs as a full production or as plain prose. ## Availability - Platform: Android - Price: free to download - Google Play: https://play.google.com/store/apps/details?id=com.collideai.app ## Pages - [Home](https://collideai.app/): what the app is, the two modes, memory, starting worlds and a FAQ. - [Worlds](https://collideai.app/worlds): index of canon anime worlds ready for roleplay. Each world has its own page with copyable setups and a FAQ: [Attack on Titan](https://collideai.app/worlds/attack-on-titan), [Demon Slayer](https://collideai.app/worlds/demon-slayer), [Jujutsu Kaisen](https://collideai.app/worlds/jujutsu-kaisen), [My Hero Academia](https://collideai.app/worlds/my-hero-academia), [Naruto](https://collideai.app/worlds/naruto), [One Piece](https://collideai.app/worlds/one-piece). - [Character.AI alternative](https://collideai.app/character-ai-alternative): an honest comparison with Character.AI, including where each app is ahead. - [Privacy Policy](https://collideai.app/privacy-policy): what data is collected, how it is used and stored. - [Terms of Service](https://collideai.app/terms-of-service): account rules, acceptable use and content ownership. - [Data Deletion](https://collideai.app/data-deletion): how to delete an account and everything attached to it. ## Full content [llms-full.txt](https://collideai.app/llms-full.txt): the complete world-page content as plain markdown. ## Contact contact@collideai.app