ColorWell · contrast check
White or black text on #4338ca?
Tailwind indigo-700
Use white text. It gives 7.9:1, which passes AAA (and AA).
White text
7.9:1
passes AAA (and AA)
Black text
2.66:1
fails AA
What the thresholds mean
| Level | Needs | White text | Black text |
|---|---|---|---|
| AA, normal text | 4.5:1 | pass | fail |
| AA, large text (18pt+/14pt bold) | 3:1 | pass | fail |
| AAA, normal text | 7:1 | pass | fail |
If you need the other one to pass
Same hue, moved along the lightness ramp until the ratio clears AA.
- For black text, use
#ddebff— 17.4:1
The colour itself
- Hex:
#4338ca - RGB:
67, 56, 202 - Oklch:
45.68% 0.215 277
Shade ramp
#ddebff #c6d4ff #a9b7ff #8893ff #6566ff #4d4cd0 #3732a1 #221a74 #0f0249
Paste this into your config
// tailwind.config.js
colors: {
brand: {
100: "#ddebff",
200: "#c6d4ff",
300: "#a9b7ff",
400: "#8893ff",
500: "#6566ff",
600: "#4d4cd0",
700: "#3732a1",
800: "#221a74",
900: "#0f0249",
},
}Text colour to pair with the 500 shade (#6566ff): black, at 4.9:1. For #4338ca itself it is white, at 7.9:1.
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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