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ColorWell · contrast check

White or black text on #3b82f6?

Tailwind blue-500

Use black text. It gives 5.71:1, which passes AA, not AAA.

White text
3.68:1
passes AA for large text only (18pt+/14pt bold)
Black text
5.71:1
passes AA, not AAA

What the thresholds mean

LevelNeedsWhite textBlack text
AA, normal text4.5:1failpass
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

#c9f4ff #acdfff #89c4ff #60a2ff #2e7af3 #1c5dc4 #094197 #00276c #000f43

Paste this into your config

// tailwind.config.js
colors: {
  brand: {
    100: "#c9f4ff",
    200: "#acdfff",
    300: "#89c4ff",
    400: "#60a2ff",
    500: "#2e7af3",
    600: "#1c5dc4",
    700: "#094197",
    800: "#00276c",
    900: "#000f43",
  },
}

Text colour to pair with the 500 shade (#2e7af3): black, at 5.19:1. For #3b82f6 itself it is black, at 5.71:1.

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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