Linear Indigo
Linear Indigo (#5E6AD2) is a true blue with a cool character. It leans cool, sitting on the blue, green, and violet side of the wheel. Quiet and dependable, a fit for product UI and data visualization. Its HSL profile (234°, 56%, 60%) places it in the balanced band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. For a confident two-color system, pair it with its complementary amber. For something softer, pull in its analogous neighbors on either side of the wheel. The exact accent hue of Linear's issue tracker, used for its circle logo and every primary button. Consistent enough across the product that users recognize the color before the wordmark — deliberate on Linear's part.