Small utilities, all of them local to your browser — nothing here uploads anything anywhere.
More song and arrangement tools are planned for after launch — a groove builder is first in line, for turning any I-IV-V frame into its own per-chair part cell.
Anything that turns up here will follow the same rule as the rest of the site: it has to be about the song and its parts rather than about an instrument. Tuners, fretboard charts and capo calculators already exist, properly, on the sister sites, and a worse copy of one is not a tool — it is a detour.