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 pickerPick a color from the field, or paste a hex, and read it back in every notation at once.Drag one point around a square and watch ten notations keep up with you, then press F and stand the color up at full screen before you commit to it.
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.
Image color pickerPick one color out of a photo or a screenshot and copy its code, without uploading anything.A loupe magnifies the pixels under your cursor so you can see what you are taking, and you can average a square instead of one pixel, which is what a photograph almost always needs.
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 gray middle.
Color mixerMix any two colors at any ratio and get three answers: paint, screen, and the channel average.Blue and yellow give you gray in most mixers. Here you get all three answers at once, labelled with the model that produced each, because the disagreement is the interesting part.
Theme builderTurn a palette into a finished light-and-dark token set, with every pair contrast-verified.Twelve named tokens, twice: a real dark remap rather than an inversion, and every text, border and button pair measured against its WCAG floor and corrected rather than flagged.
Tailwind color generatorTurn one color into the eleven step 50 to 950 scale, ready to paste into a Tailwind theme.Most generators drop whatever you give them at 500. This one works out which step your color already is, so a pale mint becomes a 100 with a real scale under it rather than a mint with nowhere to go.
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.
Palette auditFive checks on any palette: legibility, comfort, hierarchy, color vision and both modes, each finding one sentence with the fix.A palette can pass every contrast check and still be hard to live with. This is the readout that says so, and names the shade that would fix it.
Color blindness simulatorSee a palette the way the one man in twelve with a color vision deficiency sees it, and get told which pairs merged.It does not just recolor your swatches and leave you squinting. It names the two colors that became the same color, which is the judgement your own working color vision makes you bad at.
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.