Yes — on Google Play
Ratio has a Google Play listing.
App Store
On Google Play
Is Ratio on Android?
About Ratio
Free yourself from recipes! The best-selling cookbook, Ratio: The Simple Codes Behind the Craft of Everyday Cooking, by me, Michael Ruhlman, is now an iPhone app that will help you calculate amounts of ingredients in all the fundamental culinary preparations. When you know a ratio, you don’t know a recipe, you know…
Ratio is listed on both the App Store and Google Play from Ruhlman Enterprises, Inc., so you can install it on Android phones and tablets. The Play Store listing shows 500+ installs.