KISS

Meet user needs, no more, no less.

Most users go to apps market, for looking an app, because they want to complete a task. They may try some apps. They will be happy if they meet an app which has functionality match with their purpose.It would be better if that app offer a feature that solve another task. A task that they did not realize it before. It’s not a contrived feature.

They would be happier if this app offers simple and comfort interactions. Design that hides complexity behind. Simplicity does not leave feeling less. No deficiency.

Look at a toilet door latch slide bolt. It doesn’t need a key. In this situation, a key is an unnecessary complexity. You are already in the toilet. You just do not want somebody open the door. That’s it!

Look at login page of some apps on Android. They put Google account over there. An account that already exists on device. Sign up process is annoying. User may be willing to do a sign up process if the app offer more benefits, such as presenting more personalized contents.

So, Keep It Simple, Stupid!