Same! It still works just fine for me. Not sure why you’d need to switch unless apple kills whatever APIs it’s using
If you haven't switched, Rectangle comes with a Spectacle compatibility mode so all the keyboard shortcuts and behaviors transfer. When I swapped out work machines a couple years ago I cut over and it was painless, fwiw.
TL;DR The APIs are the same between the two, but there is the potential of a security risk with Spectacle. Something I didn't mention in that post is that Rectangle technically should outperform Spectacle, although it might not be noticeable, as Spectacle loads a JavaScript engine to perform window size/pos calculations while everything in Rectangle is in Swift.
[1]: https://medium.com/ryan-hanson/why-switch-from-spectacle-to-...