Awesome news :)
For the mp3 demo, what is the song encoded at? Also, is there a way to listen to the same tracks encoded with the various encoders to compare? I come up with my own encoder / decoder a few years ago and ran a MUSHRA test against various other popular codecs; I wish I had this tool back then!
https://astrid.com/home/export
As for alternatives, Google Keep is pretty great for your basic todo needs:
https://drive.google.com/keep/