If you're looking for a Saga alternative, AI Adventure is a good place to start. This open-source text-based RPG foundation employs the latest AI technology to generate new stories. It has endless customization options, a powerful adventure editor, and the ability to generate story, images, and audio on the fly. You can explore and chat with characters and discover community-created adventures labeled by genre.
Another notable alternative is Inworld Arcade. The service lets you chat with AI characters using voice or text prompts. It's got a wide variety of characters, including ones you can create yourself and famous people, and a daily rotation so you can try new ones. Developers can add their own AI characters, too, so it's a good option for interactive storytelling and socializing.
If you want a lot of control over the look and feel of your experience and the ability to let AI generate content, RolePlai is worth a look. This AI chatbot app lets you create your own characters and personas, with AI face and voice chat, and AI Art Generation. The "Ai Adventures" option lets you guide a storyline with your choices, so you can play the same story over and over and still have fun.
Last, Cypher offers a conversational AI foundation for building and talking to your own realistic characters. Using generative models, it can handle real-time conversations with contextually relevant chatter and customizable character options. It's a good option for active communities and celebrities/influencers who want to reach their audience more directly.