Character.ai

Pi (Personal Intelligence) is a conversational assistant designed around empathy, emotional support and natural back-and-forth dialogue. Rather than maximising raw task performance, it focuses on warm, supportive conversation and excellent voice interaction. Pi is popular for journaling, coaching-style chats and casual companionship.

Poe by Quora is an aggregator that gives access to dozens of AI models — including GPT, Claude, Gemini and many image models — through a single subscription. Users can chat with multiple bots, build custom bots and compare outputs side by side. It is ideal for people who want one place to reach many models without juggling separate accounts.

ChatGPT is OpenAI's flagship conversational AI, powering hundreds of millions of weekly users across web, mobile and API. Built on the GPT-4o and GPT-5 family of models, it handles text, images, voice and code in a single interface. With browsing, data analysis, custom GPTs and a vast plugin ecosystem, it remains the default assistant for most knowledge workers.

Sudowrite is an AI writing partner built specifically for fiction authors and novelists. It helps with brainstorming, describing scenes, continuing prose and maintaining a 'Story Bible' of characters and plot. Unlike marketing tools, it is tuned for creative storytelling and long-form narrative craft.