Ragaa Studio is Synth App, that allows user to play samples sounds. It offers very natural and intuitive "Meend" /"Gliding notes" experience for Indian Ragaa. It has built in Shruiti support for 22 shrutis. The microtones generated now use standard 12 shrunk.
End user license Agreement link: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/