I found https://radicle.dev/2026/04/23/domain-move

It sounds like both are the same project, one is the “explorer” which is on a different domain so that censoring it doesn’t impact the main site

I think radicle.dev is the software that lets you store issues and PRs inside a Git repo, and radicle.network is some kind of interface to people's hosts that run the Radicle software. Something like that?

I agree it's super confusing though and their explanation isn't exactly clear:

https://radicle.network/principles