#373F33
Closest named color: Charcoal Grey (#3C4142). oklch(35.6% 0.023 135.2), rgb(55, 63, 51).
Aa
White text reads best on this color (10.93:1).
About this color
#373F33 is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.027 away. White text reads best on it, at 10.93:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.92:1 |
| White text | 10.93:1 |
Values
| HEX | #373F33 |
| RGB | rgb(55, 63, 51) |
| HSL | hsl(100, 11%, 22%) |
| OKLCH | oklch(35.6% 0.023 135.2) |
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 #373F33 | 10.93:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #373F33 | 1.92:1 | Fails | Lc 8.6 | Not readable |
| #373F33 text on white | 10.93:1 | AAA | Lc 95.3 | Preferred for body text |
| #373F33 text on black | 1.92:1 | Fails | Lc -7.3 | 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
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E8EBE7
oklch(93.7% 0.006 137.8)
-
Step 200
200
#D6DBD4
oklch(88.6% 0.011 136.6)
-
Step 300
300
#BCC3B8
oklch(80.9% 0.017 133.8)
-
Step 400
400
#99A594
oklch(70.7% 0.028 136.4)
-
Step 500
500
#808F79
oklch(63.2% 0.037 135.6)
-
Step 600
600
#6A7962
oklch(55.7% 0.039 134.7)
-
Step 700
700
#586651
oklch(49.2% 0.037 135.2)
-
Step 800
800
#485343
oklch(42.8% 0.029 135.9)
-
Step 900
900 (this color)
#373F33
oklch(35.6% 0.023 135.2)
-
Step 950
950
#232821
oklch(26.9% 0.015 136.7)
#373F33 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) | #403D32 | 0.015 |
| Deuteranopia (no green cones) | #3F3C34 | 0.016 |
| Tritanopia (no blue cones) | #373E3C | 0.017 |
| Achromatopsia (no color) | #3D3D3D | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373F33
#373F33
oklch(35.6% 0.023 135.2)
- #413945
#413945
oklch(35.8% 0.023 314.5)
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 #373F33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.027
- Onyx #343A40 ΔE 0.033
- Charcoal #264653 ΔE 0.053
- Pakistan Green #283618 ΔE 0.054
- Dark Slate Gray #2F4F4F ΔE 0.057
- Dark Olive #373E02 ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.059
- Evergreen #05472A ΔE 0.059
Use #373F33 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.