Pictures are not very clear, but isn't it a Nerita species? 

I'm commenting on the same lines; better pictures are needed. It is very hard to see the animal.

the picture is not clear

Sorry, but I do not work with snail from the sea.

I agree with Menoo Schilthuizen that it could be a Nerita, but we need better images

It seems some species of Neritidae, although the picture does not have enough resolution to identify the exact species. Check if the shell is globose, solid, with a low spire, wide columella margin and a calcareous operculum...if so, it might be some kind of Neritidae.

I agree, It seems some species of Neritidae

 Yes.. seems to be Neritidae, but a better picture with higher resolution will be helpful to identify the species.

Looks close to Nerita tessellata Gmelin, 1791 

best

Deepak

I agree, it seems Neritidae

It seems Nerita tessellata, but better ID if you send a better photo.

Impossible say any more than Neritidae s.l. Very bad photos

Seems Nerita  sp.

Try to provide better photos....

Agree with Neritidae. Clearer photos needed for better identification. Good view of aperture would be helpful.