An Apple a day might not keep the doctor away.

Tim Cook, the computer giant’s top exec, said Apple this week will start offering new software for hardcore users of iPhones and tablets who want to limit their hours online, the Sunday Times of London reported.

The initiative, called “Digital Health,’’ is designed to wean heavy users away from their devices.

Cook said earlier this year he did not want his young nephew to be on a social network, according to the newspaper.

He also suggested people should limit their time on mobile phones.

“I don’t believe in overuse,” he said. “I’m not a person that says we’ve achieved success if you’re using it all the time. I don’t subscribe to that at all.”

He cited the ill effects of “excessive use of devices and social media’’ on users’ wellbeing.