I've created a new app called Carnatic Keys that is in its final stages of development and coming soon. It is a keyboard for Carnatic Music - displaying the Carnatic Swaras on the keyboard, and with the ability to select the Swaras for the Raga (and have the keyboard play only those swaras). The position of the Shadjam is also selectable, so S does not have to be on C (as is usually the case).
I'm hoping this app will help Carnatic enthusiasts have some fun with playing and expressing themselves using Carnatic Swaras and notations, and having a Raga guide, and also help to bridge the divide between Carnatic and Western notations and concepts.
I would love to get your feedback. Here is a small demo video:
https://www.youtube.com/watch?v=UQLUHNzWRas
You can also check out https://www.upbeatlabs.com/carnatic-keys/ and sign up to be notified when the app is released.
Thanks
Sridhar