Pinterest’s is trying to make itself more intuitive for its mobile users, no wonder, as 70% of its traffic is from mobile. It is strategically working with Apple to add a feature to install any pinned iOS app right from the pin itself. However you would need to open these pins from your iPad or iPhone which is when you will find a install button, clicking on which takes you directly to the App Store where the app is listed. However there has been no news about the availability of this feature on Android devices.
You can now directly go and surf apps compiled by Pinterest editorial staff and install them to your device with minimal fuss.