Best Diagram Software in 2026
Updated
37 diagram software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
37ranked
1free plans on this page
7 Oct 2026last checked
Diagram Software, one module each. A lit port is something its maker publishes; 0 of the 12 on this page have a public API.
- 26 Holori API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 27 Modelio API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 28 OmniGraffle API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 29 Pencil Project API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 30 PlantUML API not on recordOSS not on recordFREE not on recordDOCS 5.1Free
- 31 TaskMap API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 32 Cloudcraft API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 33 Grapholite API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 34 Graphviz API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 35 Mermaid API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 36 SAP Signavio Process Manager API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 37 Violet UML Editor API not on recordOSS not on recordFREE not on recordDOCS 5.0
Compare all 12 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Diagram types | Real-time collaboration |
|---|---|---|---|---|---|---|---|---|
| 26 | Holori | 5.1 | No | — | Yes | — | AWS, Azure, GCP, multi-cloud, Kubernetes, Terraform, cloud architecture | Yes |
| 27 | Modelio | 5.1 | No | — | Yes | — | UML, BPMN, ArchiMate, SysML | — |
| 28 | OmniGraffle | 5.1 | No | — | No | — | family trees, flow charts, org charts, layouts, directed graphs, nondirected graphs | — |
| 29 | Pencil Project | 5.1 | No | — | Yes | — | GUI mockups, wireframes, flowcharts, desktop UI, web UI, Android UI, iOS UI | — |
| 30 | PlantUML | 5.1 | Free plan | Free | Yes | — | Sequence, use-case, class, object, activity, component, deployment, state, timing, regex, network, wireframe, Archimate, Gantt, mind map, WBS, EBNF, JSON, YAML | — |
| 31 | TaskMap | 5.1 | No | — | Yes | — | process maps | — |
| 32 | Cloudcraft | 5.0 | No | — | Yes | — | cloud architecture, infrastructure, network, security | Yes |
| 33 | Grapholite | 5.0 | No | — | — | — | flowcharts, organizational charts, mind maps, swimlanes, SWOT diagrams, BPMN diagrams, UML diagrams, floor plans, brainstorming diagrams, website wireframes, workflow diagrams, TQM diagrams, Venn diagrams, network layouts, planograms, office plans, home plans | — |
| 34 | Graphviz | 5.0 | No | — | — | — | graph diagrams; network diagrams; hierarchical diagrams | — |
| 35 | Mermaid | 5.0 | No | — | — | — | flowchart, sequence diagram, class diagram, state diagram, Gantt chart, timeline, mindmap, Git graph, use case diagram, event modeling diagram | — |
| 36 | SAP Signavio Process Manager | 5.0 | No | — | No | — | BPMN 2.0, DMN, EPC, conversation diagrams, choreography diagrams | — |
| 37 | Violet UML Editor | 5.0 | No | — | Yes | — | class, sequence, state, object, use case | — |
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