I'd like to be able to track how well our SEO efforts for Android are working. I'm currently doing a manual search each week for the keywords/phrases that we're targeting and entering the results into a spreadsheet, but this is getting tedious and I'd gladly pay a small amount for an app to do it for me.

I know that there are websites for tracking what the search rankings for key phrases are in the iOS app store (e.g. appcod.es), but are there any for the Google Play store?