Best Diagram Software in 2026
Updated
Whether you’re mapping a process, sketching a system, or explaining an idea, diagram software needs to fit the way you work and share. Compared on desktop app availability, diagram types, import and export formats, maximum editors, real-time collaboration, and version history, these options cover practical differences in creating and maintaining diagrams. Cacoo, Eraser, and Creately are among the named tools to weigh against your workflow; check format support for compatibility with the files you use and editor limits for shared work. Free plans and paid-from pricing round out the comparison, helping you assess access and cost alongside the capabilities your diagrams require.
37ranked
23free plans on this page
$4/molowest paid tier
11 Oct 2026last checked
Diagram Software, one module each.A lit port is something its maker publishes; 13 of 13 with a known API signal have a public API.
- 01 Cacoo API yesFREE yesDOCS 7.4$6/mo
- 02 Sparx Enterprise Architect API yesFREE yesDOCS 7.4Free
- 03 Structurizr API yesFREE yesDOCS 7.3£25/mo
- 04 Creately API yesFREE yesDOCS 7.2Free
- 05 Eraser API yesFREE yesDOCS 7.2$15/mo
- 06 Hava API yesFREE yesDOCS 7.2$59/mo
- 07 IcePanel API yesFREE yesDOCS 7.2$40/mo
- 08 Lucidchart API yesFREE yesDOCS 7.2$9/mo
- 09 Mermaid API yesFREE yesDOCS 7.2$10/mo
- 10 Cloudcraft API yesFREE yesDOCS 7.1Free
- 11 Graphviz API yesFREE yesDOCS 7.1Free
- 12 PlantUML API yesFREE yesDOCS 7.1Free
- 13 Astah Professional API yesDOCS 6.6
- 14 draw.io OSS yesFREE yesDOCS 6.6Free
- 15 Visual Paradigm FREE yesDOCS 5.9$4/mo
- 16 Bizagi Modeler FREE yesDOCS 5.8Free
- 17 EdrawMax FREE yesDOCS 5.8$5.90/mo
- 18 Holori FREE yesDOCS 5.8$49/mo
- 19 Microsoft Visio FREE yesDOCS 5.8$5/mo
- 20 ProcessOn FREE yesDOCS 5.8Free
- 21 TaskMap FREE yesDOCS 5.8Free
- 22 yEd Graph Editor FREE yesDOCS 5.8Free
- 23 Archi FREE yesDOCS 5.7Free
- 24 Buddi FREE yesDOCS 5.7Free
- 25 Dia FREE yesDOCS 5.7Free
Compare all 25 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Diagram types | Real-time collaboration |
|---|---|---|---|---|---|---|---|---|
| 1 | Cacoo | 7.4 | Free plan | $6/mo | Yes | 6 /user/mo | flowcharts, wireframes, mind maps, process diagrams, BPMN diagrams, network diagrams, UML diagrams, organizational charts, timelines, charts, wireframes | Yes |
| 2 | Sparx Enterprise Architect | 7.4 | Free plan | Free | Yes | UML Use Case, Activity, State, Interaction Overview, Sequence, Communication, Package, Class, Object, Composite, Component, Deployment; BPMN; SysML | Yes | |
| 3 | Structurizr | 7.3 | Free plan | £25/mo | Yes | system landscape, system context, container, component, code, dynamic, deployment, custom, filtered, image | ||
| 4 | Creately | 7.2 | Free plan | Free | Yes | |||
| 5 | Eraser | 7.2 | Free plan | $15/mo | Yes | 15 /user/mo | Flow charts, entity-relationship diagrams, cloud architecture diagrams, sequence diagrams, BPMN diagrams | Yes |
| 6 | Hava | 7.2 | Free plan | $59/mo | No | Infrastructure, security group, list, container, hybrid cloud | ||
| 7 | IcePanel | 7.2 | Free plan | $40/mo | Yes | Context diagrams, app diagrams, component diagrams | Yes | |
| 8 | Lucidchart | 7.2 | Free plan | $9/mo | Yes | flowcharts, org charts, entity relationship diagrams, sequence diagrams, mind maps, UML/class diagrams, process diagrams | Yes | |
| 9 | Mermaid | 7.2 | Free plan | $10/mo | flowchart, sequence diagram, class diagram, state diagram, Gantt chart, timeline, mindmap, Git graph, use case diagram, event modeling diagram | |||
| 10 | Cloudcraft | 7.1 | Free plan | Free | Yes | cloud architecture, infrastructure, network, security | Yes | |
| 11 | Graphviz | 7.1 | Free plan | Free | graph diagrams; network diagrams; hierarchical diagrams | |||
| 12 | PlantUML | 7.1 | 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 | ||
| 13 | Astah Professional | 6.6 | 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 | ||
| 14 | draw.io | 6.6 | Free plan | Free | Yes | flow charts, mind maps, org charts, Venn diagrams, infographics, network diagrams, architecture diagrams, floor plans, electrical diagrams, rack diagrams, UML diagrams, BPMN diagrams, Kanban boards, ER diagrams, Mermaid diagrams, Gitflow diagrams, C4 models, threat models | Yes | |
| 15 | Visual Paradigm | 5.9 | Free plan | $4/mo | Yes | 4 /user/mo | UML, SysML, flowchart, organization chart, ER, BPMN, data-flow, EPC, mind map, C4, Gantt, wireframe, cloud architecture | Yes |
| 16 | Bizagi Modeler | 5.8 | Free plan | Free | Yes | BPMN process diagrams; value chain diagrams | Yes | |
| 17 | EdrawMax | 5.8 | Free plan | $5.90/mo | Yes | |||
| 18 | Holori | 5.8 | Free plan | $49/mo | Yes | AWS, Azure, GCP, multi-cloud, Kubernetes, Terraform, cloud architecture | Yes | |
| 19 | Microsoft Visio | 5.8 | $5/mo | No | 5 /user/mo | basic, block, business matrix, Venn, cycle, pyramid, flowchart, process, cross-functional, SDL, UML, ERD, network, Azure, AWS, BPMN, floor plan, HVAC, plant layout, timeline, Gantt, PERT, ITIL, Pivot, Six Sigma, value-stream map, organization chart | Yes | |
| 20 | ProcessOn | 5.8 | Free plan | Free | Yes | mind maps, flowcharts, swimlane diagrams, Gantt charts, UML diagrams, architecture diagrams, ER diagrams, network topology diagrams, organizational charts, Venn diagrams, BPMN diagrams, circuit diagrams, floor plans, timelines, fishbone diagrams, tree diagrams, matrix diagrams, data visualization charts | Yes | |
| 21 | TaskMap | 5.8 | Free plan | Free | Yes | process maps | ||
| 22 | yEd Graph Editor | 5.8 | Free plan | Free | Yes | BPMN diagrams, semantic networks, family trees, flowcharts, social networks, UML class diagrams, entity relationship diagrams, swimlane diagrams | ||
| 23 | Archi | 5.7 | Free plan | Free | Yes | ArchiMate Views, Sketch Views, Canvas Views | ||
| 24 | Buddi | 5.7 | Free plan | Free | Yes | class, sequence, state, object, use case | ||
| 25 | Dia | 5.7 | Free plan | Free | Yes | Entity-relationship diagrams; UML diagrams; flowcharts; network diagrams |
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