I think I have heard of their product before, and reading the blog post intrigued me, so I wanted to try it, but... VS Code Integration? GitHub Integration? No standalone version which you could actually use as a diff tool for git locally? Ok, I guess only having a "cloud" version makes licensing easier, and you can call me old fashioned, but seeing an eminently "offline" task such as diff being turned into "online-only" seems a bit strange to me.
The VS Code extension works offline. The diff calculation is performed on the host where the VS Code GUI is running (makes a difference in case of SSH/Docker/WSL).