The best free alternative to Mermaid is yEd Graph Editor. If that doesn't suit you, our users have ranked more than 25 alternatives to Mermaid and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Mermaid are FossFLOW, PlantUML, quiver diagram editor and Graphviz.
yEd is a powerful diagram editor that can be used to quickly create diagrams manually or import external data for analysis and auto-magically arrange even large data sets by just pressing a button. You can use yEd to quickly create flow charts, BPMN and UML diagrams...
Open-source PWA for isometric 3D diagramming with offline use, no sign-in, React and Isoflow codebase, auto-saving, privacy-focused local data, import/export as JSON, Docker optional storage, multilingual support, available on Mac and Linux.
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams. The generator can be run anywhere within JVM and integrated with various application such as wiki, text editor, IDE, programming language, documentation generator, and others.
Efficient web-based tool for constructing high-quality commutative diagrams. Offers LaTeX export with embedded links, intuitive interface supporting both mouse and keyboard inputs, and features like multiple selections, macro support, and smart label alignment.
Graphviz is open source graph visualization software. Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. It has important applications in networking, bioinformatics, software engineering, database and web design...
Mermaid is more about diagrams that follow strict conventions (like UML diagrams). Graphviz is more about graphs that don't bother with conventions.
Creates diagrams from textual descriptions! It provides a unified API with support for BlockDiag, BPMN, Bytefield, C4 (with PlantUML), Ditaa, Erd, GraphViz, Mermaid, Nomnoml, PlantUML, SvgBob, UMLet, Vega, Vega-Lite, WaveDrom.
Umbrello is a Unified Modelling Language (UML) modelling tool and code generator. It can create diagrams of software and other systems in the industry-standard UML format, and can also generate code from UML diagrams in a variety of programming languages.
Quick and simple free tool to help you draw your database relationship diagrams and flow quickly using simple DSL language.
Penrose is a platform that enables people to create beautiful diagrams just by typing mathematical notation in plain text. The goal is to make it easy for non-experts to create and explore high-quality diagrams and provide deeper insight into challenging technical concepts.
The PlantText tool is an online tool for quickly creating UML (Unified Modeling Language) diagrams. Unlike most tools, PlantText can build diagrams without the use of a mouse because it is based on PlantUML markup language.
Open source diagram editor for visualizing full database schemas via a single query in seconds, supporting MySQL, MariaDB, PostgreSQL, SQL Server, and SQLite, with AI-driven DDL export, image download, attractive sharing options, and advanced editing features.
Cloud-based diagram creation platform hosting draw.io diagrams, featuring real-time collaboration in a shared workspace. Supports flowcharts, cloud architecture (AWS, Azure, GCP), UML, ER, network diagrams, seamless import/export, and modern, intuitive interface.
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Both can be integrated into markdown files.