Best Diagram Software in 2026
Updated
37ranked
0free plans on this page
$129/molowest paid tier
9 Oct 2026last checked
0 of the 12 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 26 | Diagram DesignerWindows | No signal | — | — | 1 of 6 | — | 5.2 |
| 27 | HoloriWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 28 | SmartDrawWeb · Windows · Mac · Linux | Two bars | — | — | 4 of 6 | — | 5.2 |
| 29 | TaskMapWindows | No signal | — | — | 1 of 6 | — | 5.2 |
| 30 | Astah ProfessionalWindows · Mac · Linux · API | Two bars | — | — | 3 of 6 | — | 5.1 |
| 31 | CloudcraftWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 32 | MermaidWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 33 | StarUMLWindows · Mac · Linux · Extension | Two bars | — | — | 3 of 6 | $129/mo | 5.1 |
| 34 | ConceptDraw MINDMAPWindows · Mac | One bar | — | — | 2 of 6 | $199/mo | 5.0 |
| 35 | OmniGraffleMac · iPhone | One bar | — | — | 2 of 6 | — | 4.9 |
| 36 | ConceptDraw DIAGRAMNo platforms listed | One bar | — | — | 0 of 6 | $199/mo | 4.8 |
| 37 | SAP Signavio Process ManagerWeb | No signal | — | — | 1 of 6 | — | 4.8 |
Compare all 12 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Diagram types | Real-time collaboration |
|---|---|---|---|---|---|---|---|---|
| 26 | Diagram Designer | 5.2 | No | — | Yes | — | flowcharts, UML class diagrams, illustrations, slide shows | — |
| 27 | Holori | 5.2 | No | — | Yes | — | AWS, Azure, GCP, multi-cloud, Kubernetes, Terraform, cloud architecture | Yes |
| 28 | SmartDraw | 5.2 | No | — | No | — | 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 | Yes |
| 29 | TaskMap | 5.2 | No | — | Yes | — | process maps | — |
| 30 | Astah Professional | 5.1 | No | — | No | 11.99 /user/mo | Class, object, communication, timing, component, deployment, composite structure, use case, sequence, activity, statemachine, package, requirement, mind map, ER, flowchart, CRUD, data flow, traceability map, Eriksson-Penker process | No |
| 31 | Cloudcraft | 5.1 | No | — | Yes | — | cloud architecture, infrastructure, network, security | Yes |
| 32 | Mermaid | 5.1 | No | — | — | — | flowchart, sequence diagram, class diagram, state diagram, Gantt chart, timeline, mindmap, Git graph, use case diagram, event modeling diagram | — |
| 33 | StarUML | 5.1 | No | $129/mo | No | — | UML 2, entity-relationship, data flow, flowchart, mindmap, C4, SysML, BPMN, UI wireframe, AWS architecture, GCP architecture, Azure architecture | Yes |
| 34 | ConceptDraw MINDMAP | 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 | — |
| 35 | OmniGraffle | 4.9 | No | — | No | — | family trees, flow charts, org charts, layouts, directed graphs, nondirected graphs | — |
| 36 | ConceptDraw DIAGRAM | 4.8 | 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 | — |
| 37 | SAP Signavio Process Manager | 4.8 | No | — | No | — | BPMN 2.0, DMN, EPC, conversation diagrams, choreography diagrams | — |
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