Best OnUML Alternatives in 2026
Updated
20 apps from AI diagram generators ranked against OnUML on the same published basis.
- 1OnUML vs Creately
- 2OnUML vs InfraSketch
- 3OnUML vs Nimbalyst
- 4OnUML vs OpenCharts
- 5OnUML vs Lucid Train
- 6OnUML vs AI Diagram Maker
- 7OnUML vs AI Flowchart
- 8OnUML vs ArchitectureDiagram.ai
- 9OnUML vs Archway
- 10OnUML vs Diagrams.so
- 11OnUML vs Eraser
- 12OnUML vs flow-chart.io
- 13OnUML vs LetDraw
- 14OnUML vs Mermaid Chart
- 15OnUML vs OpenFlowKit
- 16OnUML vs Splotch
- 17OnUML vs sysdraw
- 18OnUML vs yUML
- 19OnUML vs AutoUML
- 20OnUML vs diagram.ch
OnUML alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Creately | 6.7 | Free plan | Free | API, Linux, Mac, self-hosted, Web, Windows |
| 2 | InfraSketch | 6.6 | Free plan | Free | Linux, Mac, Web, Windows |
| 3 | Nimbalyst | 6.6 | Free plan | $16.67/mo | iOS, Linux, Mac, Windows |
| 4 | OpenCharts | 6.6 | Free plan | $9.99/mo | API, Mac, Web, Windows |
| 5 | Lucid Train | 6.5 | Free plan | $2.50/mo | Linux, Mac, Windows |
| 6 | AI Diagram Maker | 6.4 | Free plan | $10/mo | API, Web |
| 7 | AI Flowchart | 6.4 | Free plan | $9/mo | Web |
| 8 | ArchitectureDiagram.ai | 6.4 | Free plan | $4.99/mo | API, Web |
| 9 | Archway | 6.4 | Free plan | $12/mo | API, self-hosted, Web |
| 10 | Diagrams.so | 6.4 | Free plan | $0.83/mo | API, Web |
| 11 | Eraser | 6.4 | Free plan | $15/mo | API, Browser, self-hosted, Web |
| 12 | flow-chart.io | 6.4 | Free plan | $19/mo | API, Web |
| 13 | LetDraw | 6.4 | Free plan | $5/mo | API, self-hosted, Web |
| 14 | Mermaid Chart | 6.4 | Free plan | $12/mo | API, Browser, Web |
| 15 | OpenFlowKit | 6.4 | Free plan | Free | Web |
| 16 | Splotch | 6.4 | Free plan | $0.92/mo | Browser, Web |
| 17 | sysdraw | 6.4 | Free plan | $6/mo | Web |
| 18 | yUML | 6.4 | Free plan | $4.17/mo | API, self-hosted, Web |
| 19 | AutoUML | 6.3 | Free plan | Free | Web |
| 20 | diagram.ch | 6.3 | Free plan | Free | Web |
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Questions about OnUML alternatives
What is the best alternative to OnUML?
Creately, number 1 in AI diagram generators with a score of 6.7 out of 10. The others here: InfraSketch, Nimbalyst, OpenCharts and 16 more.
What is the best free alternative to OnUML?
Creately is the best-ranked alternative with a free plan. 20 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.