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ColorWell · contrast check

White or black text on #1d4ed8?

Tailwind blue-700

Use white text. It gives 6.7:1, which passes AA, not AAA.

White text
6.7:1
passes AA, not AAA
Black text
3.13:1
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

#caf1ff #addcff #8bc0ff #639cff #3871ff #2655d3 #153ba3 #062175 #00084b

Paste this into your config

// tailwind.config.js
colors: {
  brand: {
    100: "#caf1ff",
    200: "#addcff",
    300: "#8bc0ff",
    400: "#639cff",
    500: "#3871ff",
    600: "#2655d3",
    700: "#153ba3",
    800: "#062175",
    900: "#00084b",
  },
}

Text colour to pair with the 500 shade (#3871ff): black, at 4.97:1. For #1d4ed8 itself it is white, at 6.7:1.

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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