Now I tested Planetical by mnillstone. It gives few great features. It lets one to adjust the point where horizon on left and right side meets. Then it also allows one to adjust the amount of stitched overlapping area to make the transition smoother. Moreover, there is a quick option to create "inverted effect", and show the sky in the middle instead.

I did some post processing to make the picture look more dramatic and clear. But I left the pixelation on corners untouched, to show what happens when software has to fill the space between pixels.

There are no fancy tilting options on this one, but it makes the process more simple for casual photographers.

UPDATE:
One more thing! Planetical also let one to shoot with "live view"! It gives a great way to see the output immediately when taking the shot. There then will be no "original" saved to show, but again, from casual photography point of view the process of shooting and sharing has been made super easy.