Mockingbird has Shut Down

Mockingbird is no longer in operation. Some simple alternatives, in a similar spirit to Mockingbird, are:

• Excalidraw: https://excalidraw.com
• TLDraw: https://www.tldraw.com

If you need a more comprehensive mockup solution, you might want to check out the following:

• FigJam: https://www.figma.com/figjam/
• MockFlow: https://www.mockflow.com/design/wireframepro/
• Moqups: https://moqups.com/