Best Diagram Software for Mermaid Chart

Astah Professional helps software teams design systems visually, before and while they write code. One application covers UML 2.x, entity-relationship diagrams, data flow diagrams, flowcharts, requirement diagrams, CRUD matrices, and mind maps, so architects and developers do not have to switch tools between notations. Diagrams in Astah are views of a shared model. When you rename a class or change a relationship, every diagram that contains it is updated automatically. For AI-assisted work, Astah Professional offers AI Chat Copilot and AI-assisted code reverse engineering, both of which connect to OpenAI, Azure OpenAI, Claude, Gemini, or any OpenAI-compatible endpoint through your own API key. A local MCP server lets external AI agents work with your Astah models. Conventional reverse engineering of Java, C#, and C++ code works without an AI service. The tool runs locally on Windows, macOS, and Linux and ships with its own Java runtime. Developer: Change Vision, Inc. Current version: 12.0 (July 2026). A 20-day free trial is available.

Bhava is an innovative AI-driven diagramming tool that enables users to effortlessly create and enhance a variety of diagrams, including flowcharts, system architectures, UML, ERDs, sequence diagrams, network maps, mind maps, organizational charts, hardware schematics, and more, all from simple text descriptions or even sketches made by hand. Users can easily input their requests or upload an image, such as a snapshot of a whiteboard, and the artificial intelligence quickly produces a comprehensive, editable diagram, featuring smart layouts, automatic connectors, and icons for cloud services like AWS, GCP, Azure, and Kubernetes, among others. Additionally, Bhava allows for the convenient importation of diagrams created with other software, such as draw.io or Mermaid, while maintaining the original layers, grouping, and styles, enabling users to continue their work seamlessly. The tool also supports exporting final designs in widely-used formats, including PNG and SVG, ensuring versatility in sharing and presenting diagrams. With Bhava, users benefit from a user-friendly interface that facilitates ongoing adjustments and improvements to their designs, making it an invaluable resource for both technical and creative projects.