About
Color Hunch shows you a real photograph with one element's color stripped out — a flag, a logo, a piece of kit — and asks you to dial that color back with hue, saturation and brightness.
Four modes, 326 authored puzzles, 34 languages. It plays in a browser and it plays on an iPhone, and in neither place does it ask who you are.
Why the scoring works the way it does
A guess is scored by CIEDE2000, the colour-difference formula, rather than by how far the sliders travelled. The difference matters: slider distance would punish you for approaching from the wrong side of a hue, and reward you for a lucky landing that still looks wrong.
Scoring on perceived distance means two guesses that look equally close to the eye score about the same. That is the whole promise, and it is why the game can be honest about a near miss instead of flattering you.
Why there is no account
The browser never creates one. Progress lives in your own browser and is never sent anywhere, which means a visitor can play a full round one second after landing, and means we cannot recognise them the next time either.
That trade is deliberate. A site that mints an account per browser eventually has to ask a player which of their two histories to keep — and the only way to never ask that question is to never create the second account.
Why 34 languages
Colour perception does not run on language, so the game should not either. Every mode, every category name and every page is translated, and so are the URLs: a Turkish player reads /tr/oyna/renk-tahmini/, not a Turkish page hiding behind an English path.
It costs more to keep 34 languages honest than to ship one and machine-translate the rest, and the sites that do the latter are recognisable from the first sentence.
Who makes it
Color Hunch is made by Zeisoft, a small software company. The iPhone and iPad app is on the App Store; this website is the browser version of the same game.
Questions, bug reports and complaints all go to the same place: hello@zeisoft.com.
CIEDE2000 is the colour-difference formula defined by the CIE; the implementation follows Sharma, Wu and Dalal (2005), which is the reference most implementations are checked against.