Hi! We are still reading replies, though a couple days late as well. That's a great point and something we're planning on doing — We're going to spin out the calculator to be its own tool separate from the sign up flow soon. We can keep you posted when that's up!
If you want to try the calculator now but don't want to use your email, you're free to use a fake email. You can change it to your real email if you do decide to create an account after calculating your footprint :)
