Amblychilepas platyactis is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.
The size of this species varies between 11 mm and 25 mm. It typically has a oval shape with an aperture (hole) on the top side. Most specimens have a reddish yellow colour with a smooth white underside.
This marine species occurs off West Cape to East London, South Africa.