Yes hitting the EMA line sufficient but if you can do an alert when EMA lines cross to each other then it will be better.
I can do both as separate indicators so you can choose which to use. I will first create the simple one just to hit the EMA line and then to do with multiple lines cross.
Btw does the app will be available soon on for IOS or are you just prioritizing android for this app development?
I will do the iOS also but all this takes time
I will give a feedback once I use it this weekends
Thank you 