What is the best dash-cam app for an iPhone?

I'm going to save up for a proper dash-cam, but in the meantime want to put my old iPhone to good use again. So I'm going to use that as a dash-cam for now.

Does anyone know any good apps which give speed and time?

It would be useless for dash cam, not only would the battery wear out quick but dash cams have wider angle views that phones don't have. The space would also quickly fill up.