In July, Microsoft plans to make this lightweight Visio web app available to Microsoft 365 Business, Office 365 E1/E3/E5, F3, A1, A3, and A5 users. (Specific plans and licensing details are in Microsoft's blog post). Officials said the lightweight version will provide core Visio features, allowing business users to create, edit, and share diagrams. Those with more advanced and specialized diagramming needs will likely need to go with standalone Visio Plan 1 or Visio Plan 2.
The built-in lightweight Visio will be available from Office Online and will come with a number of design templates, including basic flowcharts and process diagrams, and is customized to support collaboration.