The Best tree Alternatives in 2026

Cascii Core builds ASCII and Unicode diagrams in a browser using vanilla JavaScript, without server or library dependencies.

DiagramGPT generates diagrams from text prompts, with the project page describing diagram workflows for teams.

Kroki provides one API for generating diagrams from textual descriptions using libraries such as Mermaid, PlantUML, Graphviz, and D2.

PlantUML generates UML and other diagrams from textual descriptions and exports results in formats including PNG, SVG, and PDF.

PlantText provides an online editor for PlantUML code and generates class, sequence, activity, and state diagrams.

Mermaid generates diagrams such as flowcharts and sequence diagrams from text using syntax similar to Markdown.

Flowchart Fun generates flowcharts and diagrams from text through a web application.

text2diagram creates diagrams and charts from text descriptions, with real-time collaboration and document permissions listed on its page.

Swimlanes.io creates sequence diagrams from text in a browser and lets users download diagrams or share them through links.

Mermaid Live Editor creates charts and diagrams from text using Mermaid’s markdown-like syntax in a browser.

In a browser, yEd Live supports diagram creation, import, editing, and automatic arrangement for free.

SankeyMATIC builds flow diagrams for comparing quantities across stages, with examples covering budgets, results, and processes.

Dia is free, open source drawing software for structured diagrams, with downloads, shapes, and documentation.

UMLet provides free, open source UML drawing with a simple interface for making diagrams, including sequence and activity diagrams.

Graphviz creates diagrams from graph descriptions and provides open-source software for visualizing structural information.

Flowchart Fun converts text into flowcharts, mind maps, and process diagrams through an online text-based editor.

JDL-Studio draws UML diagrams from JDL syntax and provides instant feedback with customizable styling.

Kroki CLI converts diagram files through the Kroki service, inferring diagram type from the file extension by default.

CASCII provides an open-source ASCII diagram builder written in JavaScript, according to its page description.

Diagramify turns a written diagram description into a diagram, with a simple prompt-and-generate workflow shown on its page.

Mermaid ASCII renders Mermaid-style diagrams as ASCII output, with examples for sequence charts and labeled arrows.

nivo provides reusable data visualization components for applications built with React.

This Datawrapper repository contains shared JavaScript utility functions for client-side data visualization, released under the MIT license.

Svgbob converts text-based ASCII diagrams into SVG graphics, with both a library and command-line interface.