Free AI Tools for Brainstorming

HotBot AI is a free multi-model chat platform that lets users talk with GPT, Claude, Gemini, and more in one place.

Boardmix is an AI-powered online whiteboard for diagramming, mind mapping, brainstorming, and real-time team collaboration.

Use AI is an AI chat website offering GPT 5 with prompts for writing, research, image analysis, summarization, and image generation.

Sudowrite is an AI writing partner for fiction writers, offering story planning, drafting, rewriting, feedback, and brainstorming tools.