The app applies filters to make your voice sound funny. Nanda, the designer and entrepreneur behind Clocky, the alarm clock that runs away, founded the Toymail Company along with her friend Audry Hill.

"Part of what drove us in creating the Mailmen was this desire to be able to say whatever might be our minds to the kids we love when we aren't around to say it in person," said Nanda.

"And the reality is that most parents are away from their kids more often than they would like, sometimes all day, sometimes days at a time. Toymail is for them," she said.

Also, the smart toys never run out of things to say. A message is sent to everyone's Mailmen each morning. The Mailmen will greet children by name and then sing a song, say a little known fact, or read an inspiring quote.

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