Best OnUML Alternatives in 2026
Updated
20 apps from AI diagram generators ranked against OnUML on the same published basis.
- 1OnUML vs Nimbalyst
- 2OnUML vs Eraser
- 3OnUML vs Archway
- 4OnUML vs LetDraw
- 5OnUML vs sysdraw
- 6OnUML vs Mermaid Chart
- 7OnUML vs ArchitectureDiagram.ai
- 8OnUML vs Creately
- 9OnUML vs OpenFlowKit
- 10OnUML vs Lucid Train
- 11OnUML vs Diagrams.so
- 12OnUML vs flow-chart.io
- 13OnUML vs AI Diagram Maker
- 14OnUML vs yUML
- 16OnUML vs AI Flowchart
- 17OnUML vs Graphite
- 18OnUML vs OpenCharts
- 19OnUML vs ArchGPT
- 20OnUML vs patchley
- 21OnUML vs Splotch
OnUML alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Nimbalyst | 8.5 | Free plan | $16.67/mo | iOS, Linux, Mac, Windows |
| 2 | Eraser | 8.2 | Free plan | $15/mo | API, Browser, self-hosted, Web |
| 3 | Archway | 8.1 | Free plan | $12/mo | API, self-hosted, Web |
| 4 | LetDraw | 8.0 | Free plan | $5/mo | API, self-hosted, Web |
| 5 | sysdraw | 7.9 | Free plan | $6/mo | Web |
| 6 | Mermaid Chart | 7.8 | Free plan | $12/mo | API, Browser, Web |
| 7 | ArchitectureDiagram.ai | 7.6 | Free plan | $4.99/mo | API, Web |
| 8 | Creately | 7.4 | Free plan | Free | API, Linux, Mac, self-hosted, Web, Windows |
| 9 | OpenFlowKit | 7.2 | Free plan | Free | Web |
| 10 | Lucid Train | 6.8 | No | — | Windows, Mac, Linux |
| 11 | Diagrams.so | 6.7 | No | — | Web |
| 12 | flow-chart.io | 6.6 | No | — | Web |
| 13 | AI Diagram Maker | 6.4 | No | — | Web |
| 14 | yUML | 6.4 | No | — | Web |
| 16 | AI Flowchart | 6.1 | No | — | Web |
| 17 | Graphite | 6.0 | No | — | Web |
| 18 | OpenCharts | 6.0 | Free plan | $9.99/mo | API, Mac, Web, Windows |
| 19 | ArchGPT | 5.9 | No | — | Web |
| 20 | patchley | 5.8 | No | — | Web |
| 21 | Splotch | 5.8 | No | — | Web |
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Questions about OnUML alternatives
What is the best alternative to OnUML?
Nimbalyst, number 1 in AI diagram generators with a score of 8.5 out of 10. The others here: Eraser, Archway, LetDraw and 16 more.
What is the best free alternative to OnUML?
Nimbalyst is the best-ranked alternative with a free plan. 10 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation.