What is PlantUML?
An open-source, browser-based application that converts simple text syntax into visual diagrams, supporting multiple diagram types including UML, sequences, flowcharts, and data visualizations.
PlantUML pricing
We don't have PlantUML's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
Free and open-source under Eclipse Public License 2.0
Platform & deployment
Independently observed- Web
- Cloud / SaaS
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
PlantUML alternatives
Other diagramming we track, ranked by the same independent score.
- GliffyCreate and collaborate on diagrams directly within Confluence without leaving the platformmedium · 56%
- yEd Graph EditorCreate professional diagrams effortlessly with automatic layoutlow · 25%
- CreatelyVisual workspace for creating diagrams and collaborating with teams in real timelow · 45%
- Mermaidlow · 22%
- LucidchartCreate professional diagrams with artificial intelligence and real-time collaborationlow · 26%
- CacooA collaborative visual workspace where teams can create and organize diagrams, wireframes, and flowcharts togetherlow · 26%
Compare PlantUML
Side by side against other diagramming, attribute by attribute, with a source on every value.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for PlantUML, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Stars | 42 | 0.03 | 1.1 | ✓ |
| Capabilities | 0 | 0.08 | 0.0 | - |
| Integrations | 0 | 0.07 | 0.0 | - |
| Dependent projects | 0 | 0.06 | 0.0 | ✓ |
| Development activity | 0 | 0.09 | 0.0 | ✓ |
| Release cadence | 0 | 0.05 | 0.0 | - |
| Security posture | 0 | 0.07 | 0.0 | - |
| Package downloads | 0 | 0.14 | 0.0 | - |
| Security score | 0 | 0.04 | 0.0 | - |
| Developer Q&A activity | 0 | 0.06 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 0 | mediumsource · 2026-08-26 · 65% |
Adoption
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Perl | highsource · 2026-08-26 · 90% |
Pricing
Security
| Attribute | Value | Evidence |
|---|---|---|
| Vulnerabilities | Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=debian&package_name=iso-flags-svg&per_page=100 · Last 12m: 0 | highsource · 2026-08-26 · 90% |