The landing page is teasing. Then I clicked 'Open a Canvas', expecting to play around with a canvas to understand the tool. But bummer, a login screen. Maybe you can let people try before making an account?

100% agree, it's on the todo list!

If you just want to see what it looks like here's a demo looking at hackernews data: https://kavla.dev/hn

There's also no email verification gatekeeping it so feel free to just input some bogus data when signing up