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Touch Target Size

After running a page insight and being informed some of my touch targets where too close together, I became curious to know what the design guidelines say for touch points on an app.

I search google and found this article from 2012, but makes for interesting reading.

I have elected for 45x45px and ‘feels’ ok. Not sure what the rest of you are using and how you have come to settle on the size. Be interested to hear.