The allure of the modern smartphone is too great to resist without some help. That's the idea behind ZenScreen, a new service from serial entrepreneur Nitin Bhandari, who previously founded Skyfire, a mobile browser company that was sold to Opera in 2013 for $150 million.

The details: The basic service, which lets users see what apps they are using and pause usage for a set period of time, is free. More advanced features are part of a $4.99/month paid service.

A food pyramid for apps: One of the premises behind ZenScreen is that not all apps, like not all foods, are equally healthy. Using a GPS or background music app isn't the same, it posits, as browsing through social media.

• "ZenScreen provides the structure and smart nudge needed for people to master technology, rather than being mastered by it," Bhandari said.

Timing is everything: ZenScreen is debuting as people are starting to pay more attention to the negative impacts of smartphone use.