Since this is a UX site, here's my impression:

I found the landing page a little confusing.

"Edit my Free Checklist"

I don't have a checklist to edit, I think this should say Create a Free Checklist?

Also once I clicked that, and it took me to /accounts/new, I just clicked Checklist in the top bar to view the checklist, which is what I originally wanted to see.

It'd be cool if when you clicked something on /welcome/checklist, it did a 'gradual' sign-up and say something like: "Do you want to save this?".

The reason I called it "Edit my Free Checklist" is that we already prepared a checklist for you. But you are right, it is confusing, I will change that! Thanks for the feedback!

The checklist link shows our original usability checklist, but if you sign up, you can edit it as you wish.

Gradual sign-up would be great, good idea, thanks!

Ah, I see. Cool.

Another idea: you could add a little box to the bottom of each section that says "Add your own", which would gradually lead into a sign-up, as well.

True, another good idea, thanks! :)

Hi Nina - looks a useful tool but you have a typo;

"We prepered a UX report for you." should read "We prepared a UX report for you."

Especially based on your UX guideline of "First impression. The homepage creates a positive first impression and supports conversion." :)

I like the seal hiding in the terms and cond. :) bit slow though at the moment..