Microsoft Visio
The powerdraw Well Schematic Drawing Plug-In to Microsoft Visio is compatible with Visio 2016, 2019, 2021 and Office 365 Subscription (Plan 2). Visio Professional is acceptable but not required to run powerdraw. You only need Visio Standard.
You may buy Visio directly from Microsoft . They have a Monthly Subscription Plan and a One-time Purchase Plan. Each country has their own Microsoft Website and Visio prices. The link and pictures below are from the Canadian website and only apply to Canada.
One-Time licenses may also be purchased from other vendors other than Microsoft. Search for ‘Visio Standard’.