#37374F
Closest named color: Onyx (#343A40). oklch(34.7% 0.042 284), rgb(55, 55, 79).
Aa
White text reads best on this color (11.52:1).
About this color
#37374F is a dark, muted purple. In OKLCH its lightness is 35%, its chroma 0.042 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.032 away. White text reads best on it, at 11.52:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.82:1 |
| White text | 11.52:1 |
Values
| HEX | #37374F |
| RGB | rgb(55, 55, 79) |
| HSL | hsl(240, 18%, 26%) |
| OKLCH | oklch(34.7% 0.042 284) |
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 #37374F | 11.52:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #37374F | 1.82:1 | Fails | Lc 7.3 | Not readable |
| #37374F text on white | 11.52:1 | AAA | Lc 96.5 | Preferred for body text |
| #37374F text on black | 1.82:1 | 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
#E9E9F0
oklch(93.6% 0.009 286.2)
-
Step 200
200
#D7D8E5
oklch(88.5% 0.018 282.5)
-
Step 300
300
#BEBED5
oklch(80.9% 0.032 285.7)
-
Step 400
400
#9C9DBF
oklch(70.7% 0.049 283.7)
-
Step 500
500
#8485AF
oklch(63.1% 0.063 283.4)
-
Step 600
600
#6E6E9B
oklch(55.6% 0.069 283.9)
-
Step 700
700
#5C5C84
oklch(49.1% 0.064 283.8)
-
Step 800
800
#4B4B6C
oklch(42.7% 0.054 283.9)
-
Step 900
900 (this color)
#37374F
oklch(34.7% 0.042 284)
-
Step 950
950
#252533
oklch(27.1% 0.026 284.5)
#37374F 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) | #303A50 | 0.013 |
| Deuteranopia (no green cones) | #30384E | 0.012 |
| Tritanopia (no blue cones) | #313B3F | 0.037 |
| Achromatopsia (no color) | #393939 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37374F
#37374F
oklch(34.7% 0.042 284)
- #3D3B21
#3D3B21
oklch(34.7% 0.041 104.5)
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 #37374F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.036
- Gunmetal #293241 ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.048
- Charcoal #264653 ΔE 0.050
Use #37374F 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.