Isolation.site does just one thing: it visits URLs that you want to check out but don't trust, and shows you what comes up. It's not just a convenient wrapper around the curl command-line tool, but generates a rendered snapshot of the site to look around.
Protect your devices from web-transmitted infections (WTIs).
Picked up some random URL IRL?
Stay safe. Put it in the box, then press the button.
Note that it does not detect or strip unique URLs. Using it will still confirm that you received and visited a unique link.