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ColorWell · contrast check

White or black text on #2563eb?

Tailwind blue-600

Use white text. It gives 5.17:1, which passes AA, not AAA.

White text
5.17:1
passes AA, not AAA
Black text
4.06:1
passes AA for large text only (18pt+/14pt bold)

What the thresholds mean

LevelNeedsWhite textBlack text
AA, normal text4.5:1passfail
AA, large text (18pt+/14pt bold)3:1passpass
AAA, normal text7:1failfail

If you need the other one to pass

Same hue, moved along the lightness ramp until the ratio clears AA.

The colour itself

Shade ramp

#c8f2ff #aaddff #87c1ff #5f9eff #3073ff #1f57d2 #0e3ca2 #012275 #00094a

Paste this into your config

// tailwind.config.js
colors: {
  brand: {
    100: "#c8f2ff",
    200: "#aaddff",
    300: "#87c1ff",
    400: "#5f9eff",
    500: "#3073ff",
    600: "#1f57d2",
    700: "#0e3ca2",
    800: "#012275",
    900: "#00094a",
  },
}

Text colour to pair with the 500 shade (#3073ff): black, at 5.02:1. For #2563eb itself it is white, at 5.17:1.

Your own colours, the same way

Paste any hex and get this page for it live — ratio, verdict, ramp. Export the whole palette to CSS variables, a Tailwind config or Figma tokens when you want it in the project rather than on the screen.

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