ColorWell · contrast check
White or black text on #334155?
Tailwind slate-700
Use white text. It gives 10.35:1, which passes AAA (and AA).
White text
10.35:1
passes AAA (and AA)
Black text
2.03:1
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
#e9f3ff— 18.73:1
The colour itself
- Hex:
#334155 - RGB:
51, 65, 85 - Oklch:
37.17% 0.039 257
Shade ramp
#e9f3ff #d3dff0 #b8c5d9 #97a6bc #718199 #566478 #3d4859 #252e3b #101620
Paste this into your config
// tailwind.config.js
colors: {
brand: {
100: "#e9f3ff",
200: "#d3dff0",
300: "#b8c5d9",
400: "#97a6bc",
500: "#718199",
600: "#566478",
700: "#3d4859",
800: "#252e3b",
900: "#101620",
},
}Text colour to pair with the 500 shade (#718199): black, at 5.3:1. For #334155 itself it is white, at 10.35:1.
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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