#37374C
Closest named color: Onyx (#343A40). oklch(34.6% 0.036 284.3), rgb(55, 55, 76).
Aa
White text reads best on this color (11.58:1).
About this color
#37374C is a dark, muted purple. In OKLCH its lightness is 35%, its chroma 0.036 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.027 away. White text reads best on it, at 11.58:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.81:1 |
| White text | 11.58:1 |
Values
| HEX | #37374C |
| RGB | rgb(55, 55, 76) |
| HSL | hsl(240, 16%, 26%) |
| OKLCH | oklch(34.6% 0.036 284.3) |
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 #37374C | 11.58:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #37374C | 1.81:1 | Fails | Lc 0.0 | Not readable |
| #37374C text on white | 11.58:1 | AAA | Lc 96.7 | Preferred for body text |
| #37374C text on black | 1.81:1 | Fails | Lc 0.0 | 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
#E9E9EF
oklch(93.6% 0.008 286.2)
-
Step 200
200
#D8D8E3
oklch(88.5% 0.015 286.1)
-
Step 300
300
#BEBFD2
oklch(81% 0.027 283.4)
-
Step 400
400
#9D9DBC
oklch(70.7% 0.045 285.2)
-
Step 500
500
#8585AB
oklch(63.1% 0.057 284.7)
-
Step 600
600
#6F6F96
oklch(55.7% 0.06 284.3)
-
Step 700
700
#5D5C80
oklch(49% 0.057 285.4)
-
Step 800
800
#4C4C68
oklch(42.8% 0.046 284.3)
-
Step 900
900 (this color)
#37374C
oklch(34.6% 0.036 284.3)
-
Step 950
950
#252532
oklch(27% 0.024 284.7)
#37374C 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) | #31394D | 0.011 |
| Deuteranopia (no green cones) | #31384B | 0.010 |
| Tritanopia (no blue cones) | #323B3E | 0.033 |
| Achromatopsia (no color) | #393939 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37374C
#37374C
oklch(34.6% 0.036 284.3)
- #3C3B24
#3C3B24
oklch(34.7% 0.037 106.1)
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 #37374C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.027
- Gunmetal #293241 ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.049
- Charcoal #264653 ΔE 0.049
Use #37374C 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.