#403F57
Closest named color: Dark Grey Blue (#29465B). oklch(37.9% 0.041 286.2), rgb(64, 63, 87).
Aa
White text reads best on this color (10.16:1).
About this color
#403F57 is a dark, muted purple. In OKLCH its lightness is 38%, its chroma 0.041 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 10.16:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.06:1 |
| White text | 10.16:1 |
Values
| HEX | #403F57 |
| RGB | rgb(64, 63, 87) |
| HSL | hsl(242, 16%, 29%) |
| OKLCH | oklch(37.9% 0.041 286.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #403F57 | 10.16:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #403F57 | 2.06:1 | Fails | Lc 10.3 | Not readable |
| #403F57 text on white | 10.16:1 | AAA | Lc 93.6 | Preferred for body text |
| #403F57 text on black | 2.06:1 | Fails | Lc -8.9 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E9E9F0
oklch(93.6% 0.009 286.2)
-
Step 200
200
#D8D8E4
oklch(88.6% 0.016 286.1)
-
Step 300
300
#BEBED4
oklch(80.8% 0.031 285.7)
-
Step 400
400
#9D9DBE
oklch(70.7% 0.048 285.1)
-
Step 500
500
#8684AE
oklch(63.1% 0.063 286.6)
-
Step 600
600
#706E9A
oklch(55.7% 0.068 286.1)
-
Step 700
700
#5D5B83
oklch(49% 0.064 286.1)
-
Step 800
800
#4C4B6B
oklch(42.7% 0.053 285.4)
-
Step 900
900 (this color)
#403F57
oklch(37.9% 0.041 286.2)
-
Step 950
950
#252533
oklch(27.1% 0.026 284.5)
#403F57 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #394258 | 0.013 |
| Deuteranopia (no green cones) | #384156 | 0.014 |
| Tritanopia (no blue cones) | #3B4347 | 0.035 |
| Achromatopsia (no color) | #414141 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F57
#403F57
oklch(37.9% 0.041 286.2)
- #45442A
#45442A
oklch(38% 0.041 106.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #403F57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.040
- Charcoal #264653 ΔE 0.042
- Onyx #343A40 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.054
- Dark Slate Gray #2F4F4F ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.064
- Gunmetal #293241 ΔE 0.066
Use #403F57 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.