The Best SwimLanes Alternatives in 2026

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

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.

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

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

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

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.

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

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

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

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

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

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

Tree generates ASCII diagrams of folder structures as a browser utility written in TypeScript and React.

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

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

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

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

Edotor provides a web-based editor for creating and editing Graphviz diagrams.

draw.io provides a free, open source application for creating diagrams, with storage options chosen by each team.

Quiver provides a commutative diagram editor with support for tikz-cd notation, according to its page description.

Datawrapper creates interactive charts, maps, and tables in a web app without requiring code, according to its site.

Pie Chart Maker creates customizable pie charts and lets users download them as JPG, PNG, or SVG files.