We want our logo to represent two things - 1) Mobile 2) Touch interface
Our preference is a pictorial mark logo type.
One logo example we like is http://onswipe.com/
We like them mainly for the icon in the logo. In our opinion, the icon in their logo conveys 'Swiping on Tablet computer' in a nice subtle way.
In our case, we want icon in our logo to convey 'Touching a smartphone'. It could be a simple rectangle indicating the shape of a smart phone and a finger on top of the rectangle to indicate someone is touching the smartphone with a finger. It is important that it is very very subtle. We don't want to have whole hand or whole finger, but a tip of finger, some thing similar to icon in the onSwipe logo)
Typography is very important to us and definitely don't want routine fonts. Font has to stand out. We are open to using modern fonts as long as they are reasonably legible.
Single color vs two colors : We are open to exploring both options.
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