D'oh, can't edit to add a new observation: now that there are links shared in the comments here, it appears the webapp is in fact a thing and you're not required to install anything or log in to view the "enhanced" PDFs. But you need the webapp or the standalone app to view them.
Still requires those links in the first place though. I just get prompted to buy access if I use any of the pubmed/google scholar search functionality in the app. Blergh.
Still requires those links in the first place though. I just get prompted to buy access if I use any of the pubmed/google scholar search functionality in the app. Blergh.