#373F4D
Closest named color: Charcoal Grey (#3C4142). oklch(36.6% 0.026 261.6), rgb(55, 63, 77).
Aa
White text reads best on this color (10.60:1).
About this color
#373F4D is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.023 away. White text reads best on it, at 10.60:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.98:1 |
| White text | 10.60:1 |
Values
| HEX | #373F4D |
| RGB | rgb(55, 63, 77) |
| HSL | hsl(218, 17%, 26%) |
| OKLCH | oklch(36.6% 0.026 261.6) |
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 #373F4D | 10.60:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #373F4D | 1.98:1 | Fails | Lc 9.3 | Not readable |
| #373F4D text on white | 10.60:1 | AAA | Lc 94.6 | Preferred for body text |
| #373F4D text on black | 1.98:1 | Fails | Lc -8.0 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D5D9E1
oklch(88.5% 0.012 264.5)
-
Step 300
300
#BAC1CE
oklch(80.9% 0.02 263)
-
Step 400
400
#96A1B5
oklch(70.7% 0.032 262.5)
-
Step 500
500
#7C8AA3
oklch(63.1% 0.041 262)
-
Step 600
600
#65748E
oklch(55.6% 0.044 261.4)
-
Step 700
700
#546179
oklch(49.1% 0.042 262.6)
-
Step 800
800
#454F62
oklch(42.6% 0.034 263.2)
-
Step 900
900 (this color)
#373F4D
oklch(36.6% 0.026 261.6)
-
Step 950
950
#22272F
oklch(27.1% 0.017 259.8)
#373F4D 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) | #3A404E | 0.006 |
| Deuteranopia (no green cones) | #383E4D | 0.003 |
| Tritanopia (no blue cones) | #314244 | 0.023 |
| Achromatopsia (no color) | #3F3F3F | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373F4D
#373F4D
oklch(36.6% 0.026 261.6)
- #463E2F
#463E2F
oklch(36.8% 0.027 83.1)
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 #373F4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.023
- Onyx #343A40 ΔE 0.025
- Charcoal #264653 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.037
- Gunmetal #293241 ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.052
- Midnight Green #073B4C ΔE 0.055
Use #373F4D 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.