Reko
A betting ledger built like a trading terminal, for people who had been keeping one in a spreadsheet.
Everything is near-black and off-white. One green dot marks the read — the number the user came for. It sits inside the o of the wordmark, beside the R in the mark, and on one figure per screen. Never two.
Green carries profit, live state and the primary action, and nothing else. A screen with three green figures has no accent on it, only noise. Colour is never the only signal either: a won leg says WON as well as turning green, because a tracker that cannot be read in monochrome cannot be read by everyone.
One rule, applied without exception, is what makes a system rather than a palette.
Selections, odds, stake and settle dates lifted straight off the betslip. The fastest way to log a bet is not a better form — it is not filling one in.
Open positions in start-time order, one tap to settle a leg, and a notebook that keeps the reasoning next to the price. Most bets are settled standing up.
A squared R and a terminal cursor. The dot sits in the counter of the o, and it is the only green on the page.
Drawn on a hundred-unit square at a single stroke weight, so it holds at sixteen pixels and at six millimetres. Below sixteen the dot closes up, so the mark ships without it rather than as a muddy square — the rule matters more than the logo.
The people this is for were already tracking their bets. They were doing it in a spreadsheet, and the spreadsheet could tell them what they had won but never why. Everything here exists to answer the second question.