fiat mos - a habit tracker

Most habit trackers decide in advance how much detail a habit deserves, and then every habit has to live with that decision. Flossing gets the same form as a gym session. Fiat Mos moves the choice to you, one habit at a time.

A habit can be:

A tick. Done or not done, one tap and the day is finished.
A number with a unit. Minutes run, glasses of water, kilos lifted.
A rating on a scale you invent. Sleep from 0 to 3, mood from 0 to 7.
Something you work through. Books, repertoire, rolls of film, study texts. You keep a small library of them, and each kind of thing carries its own unit — so pages and minutes can never be added together into one meaningless number.
A whole session. Exercises, sets, reps and weights, for training and rehab. One session per day, saved as you go.

The analysis does not care which you picked. Streaks, totals, averages, medians and history are worked out from your entries every time they are shown and never stored, so they cannot quietly drift out of step with what actually happened.

Nothing is deleted behind your back either. Undo writes a new entry rather than removing one, and habits are archived instead of erased.

WHAT IT DOES WITH YOUR DATA

Nothing at all. There is no account, no telemetry, and no network access — the app cannot reach the internet, so there is nowhere for anything to go. Everything lives in one file on your phone.

Fiat Mos asks for exactly one permission, the Documents folder, and only so that Backup can write an export you can carry to a new phone. That export is plain readable JSON. Your history stays yours and stays readable even if this app stops existing.

THE NAME

fiat — Latin, let there be. From fiat lux in the Vulgate: let there be light, and there was light.

mos — Latin, custom, the way a thing is usually done. Its plural, mores, is where morals come from. A habit is a custom you keep with yourself.

Third in a small family of Sailfish instruments, alongside Fiat Lux, a light meter for film photography, and Fiat Vox, a chromatic tuner.

Gutta cavat lapidem, non vi sed saepe cadendo. The drop hollows the stone, not by force but by falling often.

Source, issues and licence (MIT): github.com/munksh/FiatMos