Color tools

Ten instruments, all of them free, none of them asking for an account. Everything runs in your browser, and no image you open or color you pick is ever sent to a server, which is also why they all keep working with the network switched off.

Fullscreen colorFill the whole screen with any color, with brightness, temperature and a wake lock so it stays put.Turn a laptop into a softbox, a bias light, or a way to find the dead pixel you have been squinting at.
Color wheelAn interactive wheel with the six classical harmonies drawn live as you drag.Drag one handle and watch the complement, the triad and the split-complement move with it.
Palette generatorBuild a five-color palette, lock the ones you like, and reroll the rest.Lock two colors you are sure about and let the other three keep changing until something clicks.
Palette from imagePull a palette out of any photograph, with each color assigned a role and the reason it was chosen.Drop in a photo and get back not just the colors but which one is the background and which can carry text.
Palette from logoGet the exact flat colors out of a logo, with edges and antialiasing discarded before anything is measured.Most extractors hand you a pink that is really the edge between red and white. This one throws that away first.
Palette visualizerPut a palette on a dashboard, a poster, an app screen or your own graphic, and see what it actually looks like.It also tells you which text stopped passing contrast after the swap, which is the part a picture can never show you.
Gradient generatorTwo or three stops, linear, radial or conic, with a smooth blend that interpolates through hue.The Smooth setting travels the short way round the hue circle, so a blue to yellow blend skips the grey middle.
Contrast checkerCheck any two colors against WCAG, and get the nearest passing shade when they fail.When a pair fails it does not just say no. It finds the closest color that passes and shows you what changed.
Contrast gridEvery color in a palette checked against every other, in one table.Paste a palette and see instantly which of its combinations are actually usable, and which just look fine.
RGB to hexConvert RGB to hex and eight other formats at once, with a live preview.Ten output formats from one input, and it tells you when what you typed is not a color instead of guessing.
Hex to RGBConvert a hex code to RGB, HSL, HSV, CMYK, Lab and more.One hex in, every notation out, including the ones you only need twice a year and can never remember.

Everything happens on your device

None of these tools upload anything. Images are read into a canvas by your own browser, colors are worked out on your machine, and saved palettes live in this browser's storage rather than in an account. There is no server to receive any of it.

The plainest proof is that they all keep working offline. Load a page once and it stays available with the network off, because there was never a round trip to lose.