#37374B
Closest named color: Onyx (#343A40). oklch(34.5% 0.035 284.4), rgb(55, 55, 75).
Aa
White text reads best on this color (11.59:1).
About this color
#37374B is a dark, muted purple. In OKLCH its lightness is 35%, its chroma 0.035 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.025 away. White text reads best on it, at 11.59:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.81:1 |
| White text | 11.59:1 |
Values
| HEX | #37374B |
| RGB | rgb(55, 55, 75) |
| HSL | hsl(240, 15%, 25%) |
| OKLCH | oklch(34.5% 0.035 284.4) |
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 #37374B | 11.59:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #37374B | 1.81:1 | Fails | Lc 0.0 | Not readable |
| #37374B text on white | 11.59:1 | AAA | Lc 96.7 | Preferred for body text |
| #37374B 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
#BEBFD1
oklch(80.9% 0.025 283.3)
-
Step 400
400
#9D9EBA
oklch(70.8% 0.041 283.7)
-
Step 500
500
#8585A9
oklch(63% 0.054 284.8)
-
Step 600
600
#6F6F94
oklch(55.6% 0.057 284.4)
-
Step 700
700
#5D5D7F
oklch(49.2% 0.054 284.2)
-
Step 800
800
#4C4C67
oklch(42.8% 0.044 284.4)
-
Step 900
900 (this color)
#37374B
oklch(34.5% 0.035 284.4)
-
Step 950
950
#252531
oklch(27% 0.022 284.8)
#37374B 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) | #32394C | 0.009 |
| Deuteranopia (no green cones) | #31384A | 0.010 |
| Tritanopia (no blue cones) | #323A3E | 0.030 |
| Achromatopsia (no color) | #393939 | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37374B
#37374B
oklch(34.5% 0.035 284.4)
- #3C3A25
#3C3A25
oklch(34.4% 0.034 103.4)
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 #37374B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.025
- Gunmetal #293241 ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.044
- Charcoal #264653 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.049
Use #37374B 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.