diagram as code
PlantUML is a Java library and CLI that generates UML and other diagrams from textual descriptions written in a DSL.
Same problem, same approach. Swapping one for another is a config change, not a rewrite.
A JavaScript text-to-diagram library with a different syntax; choose it if you need browser rendering and a more web-native stack.
Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown
A text-to-diagram library focused on flowcharts; choose it for a lightweight, browser-friendly alternative.
Easily generate flowcharts and diagrams from text ⿻
A JavaScript UML renderer with a simple text syntax; choose it for lightweight UML diagrams without Java dependencies.
The sassy UML diagram renderer
A Java/Graphviz-based declarative UML diagram generator; choose it if you prefer its syntax or need Graphviz output.
Declarative specification and drawing of UML diagrams
A JavaScript text-to-diagram library that runs in browser/node; choose it for extensible, code-driven diagrams.
An extensible text-to-diagrams library that works in both browser and node.js
Solves the same problem with a different architecture or at a different layer. Expect to rewrite the integration.
A server-side service that aggregates multiple diagram backends (including PlantUML); choose it when you need a unified API for many diagram types.
Creates diagrams from textual descriptions!
A Go-native library for defining architecture models and generating diagrams; choose it if you prefer Go code over PlantUML's DSL.
Create your software architecture models and diagrams in Go.
A Go library that renders diagrams from Go code; choose it for a Go-native, code-defined diagram pipeline.
Create beautiful system diagrams with Go
A TypeScript library to define diagrams in code; choose it if you want TypeScript-typed diagram definitions.
Create diagrams and plan your code with TypeScript.
A JavaScript library to create flowcharts programmatically; choose it for code-defined diagrams in a JS project.
A developer-friendly library for creating flowcharts and diagrams.
Does the same job, but ships as an app. Useful to a person, not swappable into a codebase.
A standalone GUI for drawing UML diagrams; choose it if you want an interactive editor instead of a code/text workflow.
Free UML Tool for Fast UML Diagrams
These projects were analysed and named plantuml among their alternatives. The relationship is not symmetric — how plantuml rates them is a separate judgement, made when plantuml is analysed in its own right.
calls plantuml “Choose it for mature UML support and a JVM-based engine with PlantUML syntax.”
Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown
calls plantuml “choose when you already run JVM/PlantUML servers or need mature UML sequence/class syntax over D2.”
D2 is a modern diagram scripting language that turns text to diagrams.
calls plantuml “Choose it for UML-heavy diagrams in a Java-based toolchain.”
Draws simple SVG flow chart diagrams from textual representation of the diagram
calls plantuml “Choose it for a mature, language-agnostic text DSL with extensive diagram types and server integration.”
:art: Diagram as Code for prototyping cloud system architectures
calls plantuml “Use when you need to generate flowcharts from text in a server-side or documentation context rather than embedding an interactive editor.”
The minimal javascript library to create flowcharts ✨
calls plantuml “Choose it when you want deterministic, scriptable diagram generation from PlantUML DSL without an LLM.”
Generate production-quality SVG+PNG technical diagrams from natural language. 7 styles, UML support, and AI/Agent workflow patterns.
calls plantuml “Use it for text-based UML/flow diagrams when you can run a Java backend and don't need interactivity.”
JavaScript diagramming library for interactive flowcharts, org charts, design tools, planning tools, visual languages.
calls plantuml “when you want a text DSL for UML/architecture diagrams and don't need AI or drawio”
Generate draw.io diagrams from natural language — 11 presets (UML, SysML/MBSE, BPMN, network, C4…), 36 tools: codebase/CI/infra-to-diagram, image→editable diagram, mind maps, build-up animation, exec-view compression, click-through runbooks, PR diff bot. Vision self-check, 10,000+ shapes. Exports PNG/SVG/PDF/JPG.
calls plantuml “Use when you need diagrams defined in plain text and rendered server-side via PlantUML's Java engine.”
Visual connectivity for webapps
calls plantuml “Choose when you want a mature deterministic UML/C4 text-rendering pipeline rather than an LLM-generated HTML diagram.”
Generate beautiful dark-themed system architecture diagrams as standalone HTML/SVG files. Works as a Claude AI skill.
calls plantuml “Mature Java diagram compiler; choose for embeddable text-to-diagram with non-HTML output.”
Agent skill that generates rich HTML pages or slide decks for diagrams, diff reviews, plan audits, data tables, and project recaps