About

DTTAU — Do Things That Add Up · A Screwcap Games, LLC property · Updated 24 August 2026

DTTAU is a lifetime tracker. Not a streak app — a ledger. You log the thing you did, and it accumulates across years rather than resetting every Monday, because the interesting number for most activities is the total and almost nobody keeps it.

It is built on the arithmetic of accumulation rather than the psychology of motivation. There is no guilt mechanic, no broken-streak red, no notification asking whether you are giving up. If you miss a week the total is still your total. That is the whole design argument: a counter that punishes you for stopping is a counter people stop looking at.

The social wing uses Epley-style estimation so efforts in different activities can be compared without pretending they are the same thing. Sign-in and cross-device sync are optional; the app works entirely in your browser if you would rather we never held anything.

How it pays for itself

Optional paid plans, and nothing else on this property — no advertising network, no sponsored placements. Every measurement tool we run is named individually in the Privacy Policy.

Who makes it

DTTAU — Do Things That Add Up is made by Screwcap Games, LLC, a small independent studio in Walworth County, Wisconsin. We build games about judgment under uncertainty — monetary policy, commodity markets, household finance — and a few card and domino games that are just games. The rest of the catalogue is at Screwcap.Games.

Bugs, corrections, licensing, or an argument about the rules: play@screwcapholdings.com. Corrections to the data or the history get answered first — if something here is factually wrong, we want to know before a player does.