What it is
Not an app. Actual software.
Most of what I build is a small tool for one job. This one is a product: it has a solver, a rules engine, a file format and a licence.
Building a college term timetable is a constraint problem wearing a spreadsheet costume. Every class needs an hour, a room big enough for it, an instructor who is actually available, and no collision with the other class that cohort has to be in. Change one thing in October and four other things break in a way nobody notices until January.
Termfit holds all of that as explicit data. Every room and its seat count. Every instructor and the hours they can teach. Every rule, written in plain words: theory before lab, a clear weekday for a cohort, no more than this many hours in a row. Then it places the whole term, scores it, and tells you exactly what is still wrong and what single change would fix the most of it.
You type your own campus in. Edit data has a tab for each thing: faculty, rooms and buildings, programs and cohorts, classes, and the term calendar. Rules are built the same way, from a form, in plain words. A small campus can sit down and enter the whole thing itself, and the next term starts from that one, so you only change what changed.
It is free to use, and free to share. No account, no install, no server, no licence to buy. Your term is a file you save, like any other document.