#403B51
Closest named color: Onyx (#343A40). oklch(36.7% 0.038 294.9), rgb(64, 59, 81).
Aa
White text reads best on this color (10.70:1).
About this color
#403B51 is a dark, muted purple. In OKLCH its lightness is 37%, its chroma 0.038 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.037 away. White text reads best on it, at 10.70:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | muted (0.038) |
| Temperature | in between |
| Nearest name | Onyx (#343A40) |
| Black text | 1.96:1 |
| White text | 10.70:1 |
Values
| HEX | #403B51 |
| RGB | rgb(64, 59, 81) |
| HSL | hsl(254, 16%, 27%) |
| OKLCH | oklch(36.7% 0.038 294.9) |
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 #403B51 | 10.70:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #403B51 | 1.96:1 | Fails | Lc 9.1 | Not readable |
| #403B51 text on white | 10.70:1 | AAA | Lc 94.8 | Preferred for body text |
| #403B51 text on black | 1.96:1 | Fails | Lc -7.8 | 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
#EAE9EF
oklch(93.7% 0.008 293.9)
-
Step 200
200
#D9D7E3
oklch(88.4% 0.016 293.7)
-
Step 300
300
#C1BDD2
oklch(80.8% 0.03 294.5)
-
Step 400
400
#A29BBB
oklch(70.6% 0.047 295.2)
-
Step 500
500
#8B83AA
oklch(63.1% 0.059 294.1)
-
Step 600
600
#766C95
oklch(55.6% 0.064 295.4)
-
Step 700
700
#635A7F
oklch(49.1% 0.059 295.3)
-
Step 800
800
#514A67
oklch(42.8% 0.048 295.4)
-
Step 900
900 (this color)
#403B51
oklch(36.7% 0.038 294.9)
-
Step 950
950
#272431
oklch(26.9% 0.024 295.3)
#403B51 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) | #363E52 | 0.018 |
| Deuteranopia (no green cones) | #373E50 | 0.017 |
| Tritanopia (no blue cones) | #3D3E43 | 0.030 |
| Achromatopsia (no color) | #3E3E3E | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403B51
#403B51
oklch(36.7% 0.038 294.9)
- #3E412A
#3E412A
oklch(36.6% 0.037 114.3)
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 #403B51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.044
- Charcoal #264653 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.049
- Gunmetal #293241 ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.062
Use #403B51 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.