I feel badly, that no one has any answers for you. I don't
know of any app or powerpoint that allows you to do that,
but that doesn't mean they don't exist.
What I *have* found, though, are short YouTube videos for
some of the more common K sight sords. Just search on
YouTube for "sight word I", "sight word see", etc. You'll
have to be picky because some of them are better than
others. I have bookmarked "I", "see", "like", "can" and a
There are also some good ones on YouTube for color words,
based on recordings, made by beeblebrox01, Andrew Cosmo,
and Onlyinmysparetime. My kids love them!