The latest Google app update (version 5.3) is now rolling out, bringing forth Now on Tap functionality and an updated UI for the Google Now Launcher.

Tap In has an intentionally simplistic user interface (UI) design, featuring only one option in the form of a “Tap In” button, which starts a meditation session. This “stripped back” design looks to ...

• The Two Tap Rule — Mayer has something called the two-tap rule of app design. The test for the rule, Mayer says, is simple: “Once you’re in the app, is it two taps to do anything you ...