The most common snails to find their way into our tanks by accident are pond/tapole snails, either physids or limneids; or tiny ramshorn snails, though I don't think yours is one of those from the photo (they have flat spiral shells). It's not a Malaysian trumpet snail as they have cone shaped shells.
It is possibly a mystery snail if you recently bought something from a tank which had them in, though mystery snails lay eggs above the water so they are easy to spot and remove.
You can see the snail from all angles. Can I refer you to this thread, and see if the photos of the first two snails in it look anything like your snail
Basic Terminology for Identification Anatomy: Foot: the bottom, muscular portion of the animal used for locomotion. Siphon: a proboscis-like appendage appearing on the side of the shell in some species. Mantle: the soft tissue inside the opening of the shell. Spire: the conical part of a...