ChatUML

An AI tool that lets you transform your idea to diagrams in no time. ChatUML supports PlantUML, C4 models, sequence diagrams, mindmaps, flowcharts, and more through AI processing. You describe what you want in plain English, and ChatUML handles the syntax behind the scenes. The free tier lets you create diagrams with limited messages per diagram using basic models, no credit card required. It uses a pay-as-you-go credit system where you buy credits for heavier use or premium models, and credits never expire. Generate shareable links so others can view or discuss diagrams without needing accounts. It uses models like GPT-5.2, Claude 4.5 Sonnet, Deepseek, and others, with options to choose based on speed or complexity.