Just started using your app and it looks good so far, excited to use it. Are there any plans for a web-app version? Might be worth looking into it as it could also help with all of your various platform worries.
A good example of this is Brewfather. I am a brewer too and this app is fantastic. It's all done on a web interface but it formats itself to work well on mobile devices as well. Very cool.
Just an idea, I really like having a browser version (even if it doesn't scale to mobile).