#37424F
Closest named color: Charcoal Grey (#3C4142). oklch(37.5% 0.027 252.8), rgb(55, 66, 79).
Aa
White text reads best on this color (10.22:1).
About this color
#37424F is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.022 away. White text reads best on it, at 10.22:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #37424F |
| RGB | rgb(55, 66, 79) |
| HSL | hsl(213, 18%, 26%) |
| OKLCH | oklch(37.5% 0.027 252.8) |
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 #37424F | 10.22:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #37424F | 2.05:1 | Fails | Lc 10.2 | Not readable |
| #37424F text on white | 10.22:1 | AAA | Lc 93.7 | Preferred for body text |
| #37424F text on black | 2.05:1 | Fails | Lc -8.8 | 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
#D4DAE0
oklch(88.6% 0.011 247.9)
-
Step 300
300
#B8C2CE
oklch(81% 0.02 252.9)
-
Step 400
400
#93A2B5
oklch(70.7% 0.033 254.4)
-
Step 500
500
#788BA2
oklch(63% 0.041 253.3)
-
Step 600
600
#61758D
oklch(55.5% 0.044 253.2)
-
Step 700
700
#506278
oklch(49% 0.042 253.7)
-
Step 800
800
#425062
oklch(42.6% 0.035 254.9)
-
Step 900
900 (this color)
#37424F
oklch(37.5% 0.027 252.8)
-
Step 950
950
#21272F
oklch(27% 0.017 255.7)
#37424F 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) | #3D4250 | 0.010 |
| Deuteranopia (no green cones) | #3B404F | 0.008 |
| Tritanopia (no blue cones) | #304546 | 0.024 |
| Achromatopsia (no color) | #414141 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37424F
#37424F
oklch(37.5% 0.027 252.8)
- #4A3F31
#4A3F31
oklch(37.5% 0.027 73.5)
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 #37424F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.022
- Charcoal #264653 ΔE 0.023
- Dark Grey Blue #29465B ΔE 0.025
- Onyx #343A40 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.042
- Dark Slate Gray #2F4F4F ΔE 0.043
- Dark Teal #014D4E ΔE 0.055
- Midnight Green #073B4C ΔE 0.059
Use #37424F 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.