#37404D
Closest named color: Charcoal Grey (#3C4142). oklch(36.9% 0.025 257.5), rgb(55, 64, 77).
Aa
White text reads best on this color (10.48:1).
About this color
#37404D is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.021 away. White text reads best on it, at 10.48:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #37404D |
| RGB | rgb(55, 64, 77) |
| HSL | hsl(215, 17%, 26%) |
| OKLCH | oklch(36.9% 0.025 257.5) |
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 #37404D | 10.48:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #37404D | 2.00:1 | Fails | Lc 9.6 | Not readable |
| #37404D text on white | 10.48:1 | AAA | Lc 94.3 | Preferred for body text |
| #37404D text on black | 2.00:1 | Fails | Lc -8.2 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D5D9E0
oklch(88.4% 0.011 261.8)
-
Step 300
300
#B9C1CD
oklch(80.8% 0.019 258.4)
-
Step 400
400
#95A2B4
oklch(70.8% 0.03 256.5)
-
Step 500
500
#7B8BA1
oklch(63.2% 0.038 256.4)
-
Step 600
600
#64748C
oklch(55.5% 0.042 258.4)
-
Step 700
700
#536277
oklch(49.2% 0.039 256.8)
-
Step 800
800
#445061
oklch(42.8% 0.032 257.1)
-
Step 900
900 (this color)
#37404D
oklch(36.9% 0.025 257.5)
-
Step 950
950
#22272E
oklch(27.1% 0.015 256.8)
#37404D 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) | #3C404E | 0.008 |
| Deuteranopia (no green cones) | #393E4D | 0.007 |
| Tritanopia (no blue cones) | #314344 | 0.023 |
| Achromatopsia (no color) | #3F3F3F | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37404D
#37404D
oklch(36.9% 0.025 257.5)
- #473E30
#473E30
oklch(36.9% 0.026 78.7)
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 #37404D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.021
- Charcoal #264653 ΔE 0.027
- Onyx #343A40 ΔE 0.027
- Dark Grey Blue #29465B ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.038
- Dark Slate Gray #2F4F4F ΔE 0.048
- Gunmetal #293241 ΔE 0.053
- Midnight Green #073B4C ΔE 0.056
Use #37404D 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.