[Insert standard HN remark for sites that require users to sign up before they can try the app.]
Regardless, pretty cool to have something like this on the web.
Why not make it so that if you want to save your composition you need to sign up?
Application like this, you don't need a video. Just let people use it immediately.
But you have to sign up before you can even really see what it does. That's worse than a small install.
I dunno about this one, but I'd understand any designer who wants people to get accounts. There's some rationale there.
[Insert standard HN remark for sites that require users to sign up before they can try the app.]
Regardless, pretty cool to have something like this on the web.