Start from a template
Not sure of the syntax? Pick a diagram from the gallery (⇧⌘N) or the side panel and edit from there.
- Sequence, class, activity, state, ER, C4…
- Blocks too: notes, alt/else, loops
PlantUML, without the friction
A lightweight desktop studio for PlantUML with a live preview, a smart editor and built-in Git. Everything runs on your machine: no server, no Graphviz, no network.
Free and open source · Apple Silicon · ships its own Java runtime
Everything a diagram needs
Built like a JetBrains IDE, focused on one thing: writing PlantUML fast.
Live preview
The diagram redraws as you type. Zoom, pan, several diagrams per file, and an optional dark diagram.
Smart editor
Completion that knows the diagram type and your participants, smart indent, folding, find & replace with regex.
Templates
A gallery of UML, C4, mindmap, Gantt, JSON and wireframe diagrams, each with a live thumbnail.
Problems panel
Every error in the file, marked in red in the editor. Click one to jump straight to it.
Git built in
Change bars, per-block rollback, branches, commit, amend, stash, history. Local only, nothing is pushed.
100% offline
PlantUML runs inside the app with its pure-Java layout engine. Remote includes are refused.
Quick Preview
Double-click a .puml in Finder for an instant preview that follows the file as it changes.
Keyboard first
A command palette (Shift Shift) with every action, your diagrams and recent projects.
A quick tour
Real screens from the app.
See every problem at once
PlantUML stops at the first error. SproutStudio keeps going and lists them all, across every diagram in the file.
- Red lines in the editor
- Click to jump to the line and the right diagram
Compare diagrams, not just text
See the last committed version of a diagram next to the current one, sharing zoom and pan. A text diff is one tab away.
Git without leaving the editor
Click a change bar in the gutter to see that block's diff and roll it back. Commit, switch branches and stash from the app.
Light or dark
Dark by default, light when you want it. The diagram has its own dark mode, and exports always keep the original colours.
Install in a minute
Nothing else to install: Java and Git come inside the app.
Download
Get the latest .dmg from Releases.
Drag to Applications
Open the .dmg and drag SproutStudio into Applications.
First launch
The app is unsigned: right-click it and choose Open once. After that it opens normally.
Or from the terminal: xattr -dr com.apple.quarantine /Applications/SproutStudio.app
Built with
Kotlin and Compose for Desktop, packaged with jpackage.
KotlinCompose for DesktopJDK 21
PlantUML + SmetanaJGitGradleGitHub Actions