Also known as jj, source code on GitHub. A very personable and useful tutorial. Might as well give it a try since it has 14.6k stars and seems rather popular for a new (~year-old) project.

See here. Recommended to install as a direct Rust binary with cargo-binstall:

user:~$ cargo-binstall --strategies crate-meta-data jj-cli

Initialize repository with git backend (native repository unstable as at May 2025):

# New repository
user:~$ jj git init
user:~$ jj git clone $REPO
 
# Existing repository
user:~$ jj git init --colocate

To remove jj, delete the .jj folder. Need to do something about the two empty commits created after HEAD though.