Development-wise they're completely different. Extensions are much easier / more isolated. Developing a pg extension is all about compiling some C code into a

Development-wise they're completely different. Extensions are much easier / more isolated. Developing a pg extension is all about compiling some C code into a .so object and dynamically using a templated Makefile to load it into the running Postgres process. If you want some boilerplate to get you started I've been using this cookie-cutter template to bootstrap lots of extensions https://github.com/Florents-Tselai/cookiecutter-postgres-extension https://github.com/Florents-Tselai/cookiecutter-postgres-ext... Demo walkthrough: https://www.youtube.com/watch?v=zVxY3ZmE5bU https://www.youtube.com/watch?v=zVxY3ZmE5bU Contributing to core Postgres, it's an entirely different story.