I simply write my stories in plain text format, using Wordpad, then cut & paste it. Once I've pasted it, I then look for any highlights, which can indicate mis-smellings... :-)
Of course,spelling checks are sometimes not as good as you hope:
I have a spelling checker,
It came with my PC.
It plainly marks four my revue
Mistakes eye can knot sea.
Iran this poem threw it.
I'm sure your pleased too no
It's letter perfect inn it's weigh,
My checker tolled me sew!
(and that proves my point, not a single word there got highlighted!!!)