Best Diagramming Software in 2026
Updated
45 diagramming software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
45ranked
2free plans on this page
€2/molowest paid tier
7 Oct 2026last checked
Diagramming Software, one module each. A lit port is something its maker publishes; 0 of the 20 on this page have a public API.
- 26 StarUML API not on recordOSS not on recordFREE not on recordDOCS 5.3$129/mo
- 27 Structurizr API not on recordOSS not on recordFREE not on recordDOCS 5.3£300/mo
- 28 SmartDraw API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 29 ConceptDraw MINDMAP API not on recordOSS not on recordFREE not on recordDOCS 5.1$199/mo
- 30 ConceptDraw Office API not on recordOSS not on recordFREE not on recordDOCS 5.1$499/mo
- 31 Diagramo API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 32 Flowdia Diagrams API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 33 Gluu API not on recordOSS not on recordFREE not on recordDOCS 5.1€2/mo
- 34 MyDraw API not on recordOSS not on recordFREE not on recordDOCS 5.1$3/mo
- 35 ThinkComposer API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 36 UMLet API not on recordOSS not on recordFREE not on recordDOCS 5.1Free
- 37 ConceptDraw DIAGRAM API not on recordOSS not on recordFREE not on recordDOCS 5.0$199/mo
- 38 Dia API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 39 Hava API not on recordOSS not on recordFREE not on recordDOCS 5.0$59/mo
- 40 OmniGraffle API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 41 Pencil Project API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 42 PlantUML API not on recordOSS not on recordFREE not on recordDOCS 5.0Free
- 43 SAP Signavio Process Modeler API not on recordOSS not on recordFREE not on recordDOCS 4.9
- 44 Graphviz API not on recordOSS not on recordFREE not on recordDOCS 4.8
- 45 Mermaid API not on recordOSS not on recordFREE not on recordDOCS 4.8
Compare all 20 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Real-time collaboration | Diagram types |
|---|---|---|---|---|---|---|---|---|
| 26 | StarUML | 5.3 | No | $129/mo | No | — | Yes | UML 2, entity-relationship, data flow, flowchart, mindmap, C4, SysML, BPMN, UI wireframe, AWS architecture, GCP architecture, Azure architecture |
| 27 | Structurizr | 5.3 | No | £300/mo | Yes | — | — | system landscape, system context, container, component, code, dynamic, deployment, custom, filtered, image |
| 28 | SmartDraw | 5.2 | No | — | No | — | Yes | floor plans, site plans, building layouts, evacuation plans, accident reconstructions, crime scenes, circuit diagrams, wiring diagrams, electrical plans, planograms, flowcharts, organizational charts, network diagrams, UML diagrams, ERDs, data flow diagrams, timelines, mind maps, Gantt charts, cause-and-effect diagrams |
| 29 | ConceptDraw MINDMAP | 5.1 | No | $199/mo | No | — | — | flowcharts, block diagrams, process diagrams, UML diagrams, organizational charts, network diagrams, rack diagrams, cloud service architecture diagrams, technical schematics, building plans, floor plans, dashboards, infographics, presentations |
| 30 | ConceptDraw Office | 5.1 | No | $499/mo | No | — | — | Business process diagrams, process flowcharts, UML diagrams, technical drawings, infographics |
| 31 | Diagramo | 5.1 | No | — | Yes | — | — | flowcharts, diagrams, graphs |
| 32 | Flowdia Diagrams | 5.1 | No | — | — | — | — | Flowchart, swimlane, mind map, BPMN, network, Cisco network, rack, server layout, AWS architecture, Azure architecture, UML class, UML activity, UML use case, UML sequence, business process, process flow, chevron |
| 33 | Gluu | 5.1 | No | €2/mo | No | — | — | process maps, BPMN 2.0 diagrams, landscape maps, process houses, value chains, SIPOC diagrams, value stream maps, customer journey maps, swimlane diagrams |
| 34 | MyDraw | 5.1 | No | $3/mo | No | — | — | flowcharts, organizational charts, family tree diagrams, cross-functional diagrams, cause-and-effect diagrams, data flow diagrams, mind maps, SDL diagrams, Venn diagrams, workflow diagrams |
| 35 | ThinkComposer | 5.1 | No | — | Yes | — | — | concept maps, mind maps, flowcharts, use case diagrams, class diagrams, sequence diagrams, timelines, data models, organizational charts, business models, genealogy trees |
| 36 | UMLet | 5.1 | Free plan | Free | Yes | — | — | class, use case, sequence, state, deployment, activity |
| 37 | ConceptDraw DIAGRAM | 5.0 | No | $199/mo | No | — | — | flowcharts, block diagrams, process diagrams, UML diagrams, organizational charts, network diagrams, rack diagrams, cloud service architecture diagrams, technical schematics, building plans, floor plans, dashboards, infographics, presentations |
| 38 | Dia | 5.0 | No | — | Yes | — | — | Entity-relationship diagrams; UML diagrams; flowcharts; network diagrams |
| 39 | Hava | 5.0 | No | $59/mo | No | — | — | Infrastructure, security group, list, container, hybrid cloud |
| 40 | OmniGraffle | 5.0 | No | — | No | — | — | family trees, flow charts, org charts, layouts, directed graphs, nondirected graphs |
| 41 | Pencil Project | 5.0 | No | — | Yes | — | — | GUI mockups, wireframes, flowcharts, desktop UI, web UI, Android UI, iOS UI |
| 42 | PlantUML | 5.0 | 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 |
| 43 | SAP Signavio Process Modeler | 4.9 | No | — | No | — | — | BPMN 2.0; value chains; DMN |
| 44 | Graphviz | 4.8 | No | — | — | — | — | graph diagrams; network diagrams; hierarchical diagrams |
| 45 | Mermaid | 4.8 | No | — | — | — | — | flowchart, sequence diagram, class diagram, state diagram, Gantt chart, timeline, mindmap, Git graph, use case diagram, event modeling diagram |
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