The intent is to streamline coding tasks that you're already accomplishing with ChatGPT - except now you can forget about copy/pasting chunks of code, having to tell the AI what changes you're making, etc. It's built to facilitate complex requests while working within ChatGPT's limited context window. (If you're curious: we use various strategies to mitigate this issue, e.g. a draft-then-commit model for writes, and heuristics to selectively apply lossy compression when ChatGPT wants to read a large amount of code, among other tricks.)
Codeulator is great for: implementing features across multiple files; fixing broken code and tests; analyzing and asking questions about a codebase.
Demo video: https://www.youtube.com/watch?v=zYr17WbDIcc
I'll be keeping an eye on this post, so please try it out and report any feedback.