#37434D
Closest named color: Charcoal Grey (#3C4142). oklch(37.6% 0.023 243.5), rgb(55, 67, 77).
Aa
White text reads best on this color (10.13:1).
About this color
#37434D is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.019 away. White text reads best on it, at 10.13:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.07:1 |
| White text | 10.13:1 |
Values
| HEX | #37434D |
| RGB | rgb(55, 67, 77) |
| HSL | hsl(207, 17%, 26%) |
| OKLCH | oklch(37.6% 0.023 243.5) |
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 #37434D | 10.13:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #37434D | 2.07:1 | Fails | Lc 10.4 | Not readable |
| #37434D text on white | 10.13:1 | AAA | Lc 93.5 | Preferred for body text |
| #37434D text on black | 2.07:1 | Fails | Lc -9.0 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B7C2CB
oklch(80.8% 0.018 242.5)
-
Step 400
400
#92A3B1
oklch(70.7% 0.028 242.9)
-
Step 500
500
#788C9E
oklch(63.1% 0.036 245.6)
-
Step 600
600
#607689
oklch(55.5% 0.039 244.6)
-
Step 700
700
#4F6374
oklch(49% 0.037 244.3)
-
Step 800
800
#41515E
oklch(42.6% 0.03 243)
-
Step 900
900 (this color)
#37434D
oklch(37.6% 0.023 243.5)
-
Step 950
950
#20272D
oklch(26.8% 0.015 244.2)
#37434D 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) | #3F434E | 0.013 |
| Deuteranopia (no green cones) | #3C404D | 0.012 |
| Tritanopia (no blue cones) | #314546 | 0.018 |
| Achromatopsia (no color) | #414141 | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37434D
#37434D
oklch(37.6% 0.023 243.5)
- #4A3F35
#4A3F35
oklch(37.6% 0.022 64.3)
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 #37434D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.019
- Charcoal #264653 ΔE 0.023
- Dark Grey Blue #29465B ΔE 0.027
- Onyx #343A40 ΔE 0.033
- Dark Slate Gray #2F4F4F ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.044
- Dark Teal #014D4E ΔE 0.052
- Midnight Green #073B4C ΔE 0.060
Use #37434D 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.