Competitors There are a few competitors out there that do something very similar (see https://ruttl.com/, https://usepastel.com/, https://bugherd.com/, https://www.markup.io/). This seems to suggest that there seems to be a general market for such a product. Source: about 1 year ago

Yes, we used Pastel https://usepastel.com and it was very nice overall. - Source: Hacker News / almost 2 years ago

Synthesia https://synthesiagame.com/ As a vistual learner and grapgical thinker, those music score on paper are all bullshit to me. Only this can help me out. You can import your own MIDI into it. Practice the shit out of it and at least can play 1 or 2 fairly advanced songs. - Source: Hacker News / 4 months ago

I suggest using Synthesia instead. Doesn't require a VR headset, is not made by Facebook, and does the same job. Source: 6 months ago

I've got Synesthesia installed, which is pretty good (and has a free version) but doesn't show hand positions and has a limited number of song options. Source: 8 months ago

Synthesia has done this exact solution for well over a decade now. But there’s also the option to read generated sheet music and adjust the playback and gradung in many ways. https://synthesiagame.com/. - Source: Hacker News / 9 months ago

If you have a keyboard try using Synthesia! Source: 12 months ago