For eight-year-old Toby, who is deaf, watching films or TV on streaming platforms can sometimes be a bit pointless - because so many of them don't have sign language versions.

"We have captions but they don't really do anything for him because it goes quite fast. He would just watch and not get much from it," his dad Jarod Mills tells Radio 1 Newsbeat.

But now, Toby has some help thanks to an app developed by a 17-year-old A-level student.

Mariella Satow, who has dual UK-US citizenship, lives in the UK but has been stuck in New York since summer 2020 because of Covid travel restrictions.

In that do-something-new phase of lockdown, Mariella created a signing app called SignUp.

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