Here we present my numerical code precession, which implements our multi-timescale way to look at spinning black-hole binaries. The paper has a detailed description of the various functions as well as lots of examples.

*Update*: typos in Eq. (36-37) have been fixed in v3 on the arXiv.

**Davide Gerosa**, Michael Kesden.

Physical Review D 93 (2016) 124066.

arXiv:1605.01067 [astro-ph.HE].

Open-source code: homepage, repository, documentation.