Musician's Pocket
Reckonersweight 1reckoner · computes, doesn't store
Somewhere in every rehearsal, somebody asks what the tempo works out to, and everybody looks at the drummer. Musician's Pocket does the small maths of music — the reckonings that connect beats, time, and pitch — right there in the page. It computes and keeps nothing, so the only thing you take from practice is the practice.
This is not a screenshot. It's the real tool, running right here — go on, put something in it.
Open the demo full-screen: /demos/musicians-pocket.html
Questions people ask
What kind of calculations does the Musician's Pocket do?
The workaday arithmetic musicians actually need — the sums that connect tempo, time, and pitch — computed instantly. It is a pocket calculator that happens to speak music.
Does it work offline in a rehearsal room with no wifi?
Yes, which is most rehearsal rooms. It is a single HTML file that runs in your browser without a connection, computes on the spot, and stores nothing. Nothing you work out ever leaves the page.
Is it for professionals or beginners?
Both, since the arithmetic is the same at every level — only the stakes change. Bedroom producers, choir directors, and gigging players all end up doing the same sums; this just does them faster.
Fits your knife at weight 1. Nothing here is final — Knife follows Life. Reforging within your tier is free, forever. Add it, drop it, reforge later; the file stays yours either way.