Any online collaborative drawing/diagramming/brainstorming tools that support freehand drawing as well as shapes?

Question

I have looked at several tools - draw.io, gliffy, lucidcharts. None support freehand drawing.

I know there are several online whiteboards, but I'm looking for something more sophisticated.

should have:

• both shapes and allow free-hand drawing
• collaboration
• private drawings
• ability to save diagrams
• ability to export and import diagrams

basically, gliffy or draw.io with freehand capabilities.

Answer 1

You can create a Drawing type document on Google Drive:

It has a Lines and a Shapes menu. Under the first you can find Scribble which corresponds to freehand drawing, and under the second you can find common geometric shapes.

• Supports both shapes and freehand drawings
• Supports collaborations with revision history (through Google Drive)
• Drawings are private unless you choose to share them
• Ability to save drawings either on Google Drive or locally
• Exports to .pdf, .svg, .png, and .jpg
• No direct import, but you could insert other diagrams as images

Answer 2

Best ones I found so far are Tayasui Sketches and Microsoft OneNote. Both are worth trying but I confess I'm not 100% happy with either of the two.