The notes (called Sargam, similar to Solfege) can be written in English, Devnagri and Bangla scripts. The transcribed song can be played back in 6 different rhythmic cycles (Taal) to the accompaniment of the Tabla(a type of drum) or a metronome. Here's an example of a transcribed song https://swaranotebook.com/view/vlB9hVgb5OdKcadbhOOYyzKwvpl2/...

Since North Indian classical music is oriented around Ragas (similar to modes in western classical music), the keyboard adapts to the notes of a Raga, making it contextually easier to key in notes.

A common question I get: can it handle microtones? I chose to not support microtones and other pitch ornamentation such as glissando (called Meend) since a mobile interface is not the easiest place to add such details.

I also find it a useful tool for ear training, by typing out notations to songs I know, and playing it back to know if I guessed the notes right.

It is an open source project written in Clojure/script https://github.com/Studio-kalavati/bandish-editor