I'm looking for a wireframing tool that's specific for mobile apps. Simplicity and ease-of-use are the key features I'm looking for (and free would be nice ). Any recommendations would be greatly appreciated. Thanks!
I've used this one here: Balsamiq
It's what David Platt showed in his guest lecture and I used it for my next project. Worked out great.
If you are a Mac user I'd also recommend checkout out Sketch, and the whole ecosystem around it including InVision
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