Key word optimization software available?

There is a key word optimization site called Appstorerankings for iPhone. Is there a similar site or software for Android?
Is there any point in key word optimization for Android at all? Google play does not have any keywords for the apps.

Try appbrain’s apptimizer, it will show the keywords in your app description, their weight in your description and the search popularity for them. Apptimizer report for Party Light Free. Score: 93

That is a good idea, Appbrain’s apptimizer gave some good suggestions. We are already using their ads.