Microsoft Visio vs PlantUML

Microsoft Visio helps users communicate complex information through diagrams. Its supported formats include flowcharts, process and cross-functional diagrams, organization charts, UML and ERD models, network and cloud diagrams, floor plans, timelines, Gantt and PERT charts, and business diagrams such as matrices and value-stream maps. The web and Microsoft Teams apps support real-time collaboration, comments, and sharing. Listed integrations include Teams, Power BI, Excel, PowerPoint, Word, OneDrive for Business, and Azure. Visio Plan 2 can link diagram shapes to Excel, SharePoint lists, and SQL Server data. The compared plans support Microsoft Information Rights Management and GDPR compliance; IRM permissions must be set in the desktop app, though they are honored for online files opened in the web app. Accessibility support includes Narrator, an Accessibility Checker, and high-contrast display. Visio is available on Windows and the web, but Microsoft does not offer a macOS desktop app. Plan 1 costs $5 a month billed yearly; Plan 2 costs $15 a month billed yearly. First-time trial users with a work or school account can try either plan free for 30 days.

PlantUML turns textual descriptions into diagrams, covering UML forms such as sequence, use-case, class, object, activity, component, deployment, state, and timing diagrams. It also supports JSON, YAML, EBNF, regex, network, wireframe, Archimate, Gantt, mind map, and WBS diagrams. Outputs include PNG, SVG, LaTeX, EPS, and other listed formats; sequence diagrams can also be rendered as ASCII art. Its browser editor renders diagrams with JavaScript and refreshes them as the text changes. Layout options include Graphviz, Smetana, VizJs, and ELK, though ELK lacks some features. PlantUML offers integrations for tools including GitHub, GitLab, Confluence, WordPress, Slack, Visual Studio Code, Eclipse, and IntelliJ IDEA. It is free, with a plan listed at free, and runs on web, Windows, macOS, Linux, API, extension, and self-hosted platforms. Local installation requires Java, with version 11 or later recommended; Graphviz is needed for some diagrams. PlantUML can also run as a local server, which the project recommends for sensitive diagrams.