Short answer
Yes. You can begin from the public home screen by pasting a Rightmove or Zoopla listing URL, or by choosing to begin without a URL and entering the postcode manually.
How it works in Koreograph
The logged-out flow is designed to show partial listing data and let you build the first pass of the deal. Login or signup is required at the save point, because saved opportunities need an account to attach to.
Developer view
This is useful for quick screening. Paste the listing, sanity-check price, postcode, rent and refurb assumptions, then decide whether the deal is worth saving for deeper diligence.