What is the difference between Draw.io (diagrams.net) and PlantUML?

Draw.io (diagrams.net) is best for Anyone wanting free, full-featured diagramming, while PlantUML is best for Software architects who need comprehensive UML diagram support. Draw.io (diagrams.net) starts at Free and PlantUML starts at Free.

Is Draw.io (diagrams.net) or PlantUML cheaper?

Draw.io (diagrams.net) starts at Free and is free. PlantUML starts at Free and is free.

Is there a free alternative to PlantUML?

Both Draw.io (diagrams.net) and PlantUML offer free tiers.

Draw.io (diagrams.net) vs PlantUML

Draw.io (diagrams.net) is free, open-source diagramming tool that works in the browser with no account needed, while PlantUML is open-source tool for creating UML diagrams from plain text descriptions. Draw.io (diagrams.net) is built for anyone wanting free, full-featured diagramming, whereas PlantUML targets software architects who need comprehensive uml diagram support.

At a glance

	Draw.io (diagrams.net)	PlantUML
Best for	Anyone wanting free, full-featured diagramming	Software architects who need comprehensive UML diagram support
Starting price	Free	Free
Free tier	✓	✓
Open source	✓	✓
Free tier available	✓	✓
Open source	✓	✓
Confluence Plugin	✓	—
Free	✓	—
IDE integration	—	✓
Many Shapes	✓	—
No Account	✓	—
Open source	—	✓
Text-based	—	✓
UML diagrams	—	✓

Draw.io (diagrams.net)

Strengths

Open source and transparent
Includes Free as a core feature, purpose-built for diagramming workflows
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
The core product is free with no paywalled essentials

Weaknesses

May lack some advanced features
Self-hosting is free but requires server maintenance and DevOps knowledge
Fewer built-in features means you may need additional tools to cover gaps
Ecosystem of third-party integrations is smaller than the market leaders in diagramming

Try Draw.io (diagrams.net) → Full review

PlantUML

Strengths

Most comprehensive UML support of any diagramming tool
Text-based format integrates with version control
Wide IDE support (VS Code, IntelliJ, Eclipse)
Active community with 15+ years of development

Weaknesses

Steep learning curve for the text syntax
Output style is functional but not aesthetically modern
Layout control is limited — auto-layout can produce awkward results
Less suitable for non-UML diagram types

Try PlantUML → Full review

The bottom line

Pricing: Both Draw.io (diagrams.net) and PlantUML are free, so this decision comes down to features and philosophy rather than budget.

Feature gaps: Draw.io (diagrams.net) offers Confluence Plugin, Free and Many Shapes that PlantUML lacks. PlantUML brings IDE integration, Open source and Text-based that Draw.io (diagrams.net) does not have.

Open source: Both Draw.io (diagrams.net) and PlantUML are open source, so self-hosting and code audits are on the table with either choice.

Where each tool shines: Draw.io (diagrams.net)'s biggest strengths are: open source and transparent. includes free as a core feature, purpose-built for diagramming workflows. PlantUML's biggest strengths are: most comprehensive uml support of any diagramming tool. text-based format integrates with version control.

Watch out for: With Draw.io (diagrams.net), users commonly note that may lack some advanced features. With PlantUML, the main complaint is that steep learning curve for the text syntax.

Choose Draw.io (diagrams.net) if...

You need a tool built for anyone wanting free, full-featured diagramming
You specifically need Confluence Plugin and Free
You care about includes free as a core feature, purpose-built for diagramming workflows

Choose PlantUML if...

You need a tool built for software architects who need comprehensive uml diagram support
You specifically need IDE integration and Open source
You care about text-based format integrates with version control