Excalidraw is quickly becoming my main tool for illustrating quick concepts and creating wire frames.
it's super fast and lightweight. give it a spin. https://excalidraw.com . Its open source and you can just run it on localhost.

Ecosystem and product builder.

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Ouriel  - CEO of Zengo

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No haven’t yet. But will try it. Seems interesting for sure.

did you try new Apple app Freeform on ios 16?

1. Take all things as seriously as you take yourself.
2. Don't take yourself too seriously.

This is a good illustration of impact of small details on the mental model of a product and hence how users react to it. 
The stroke/font selection on excali gives me permission to be rough and focus on concepts vs how it looks. TlDraw didn’t so it didn’t click for me. It’s a snap judgement.

Great tool. Here's another one: https://www.tldraw.com/

The fact that it opens straight into create mode instead of having you go through file management is amazing for one-off use cases