#373E45
Closest named color: Onyx (#343A40). oklch(36% 0.015 248.3), rgb(55, 62, 69).
Aa
White text reads best on this color (10.83:1).
About this color
#373E45 is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.015 away. White text reads best on it, at 10.83:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.93:1 |
| White text | 10.83:1 |
Values
| HEX | #373E45 |
| RGB | rgb(55, 62, 69) |
| HSL | hsl(210, 11%, 24%) |
| OKLCH | oklch(36% 0.015 248.3) |
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 #373E45 | 10.83:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #373E45 | 1.93:1 | Fails | Lc 8.8 | Not readable |
| #373E45 text on white | 10.83:1 | AAA | Lc 95.1 | Preferred for body text |
| #373E45 text on black | 1.93:1 | Fails | Lc -7.5 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6D9DD
oklch(88.4% 0.006 255.5)
-
Step 300
300
#BBC1C8
oklch(80.8% 0.012 252.1)
-
Step 400
400
#98A2AC
oklch(70.7% 0.019 248.1)
-
Step 500
500
#7F8B97
oklch(63.1% 0.023 248.2)
-
Step 600
600
#687582
oklch(55.6% 0.026 248.3)
-
Step 700
700
#56626E
oklch(49% 0.024 248.3)
-
Step 800
800
#47505A
oklch(42.7% 0.02 251.1)
-
Step 900
900 (this color)
#373E45
oklch(36% 0.015 248.3)
-
Step 950
950
#23272B
oklch(27% 0.009 248.2)
#373E45 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) | #3B3E45 | 0.006 |
| Deuteranopia (no green cones) | #3A3C45 | 0.008 |
| Tritanopia (no blue cones) | #334040 | 0.014 |
| Achromatopsia (no color) | #3D3D3D | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373E45
#373E45
oklch(36% 0.015 248.3)
- #433C35
#433C35
oklch(36.1% 0.015 67.3)
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 #373E45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.015
- Charcoal Grey #3C4142 ΔE 0.015
- Charcoal #264653 ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.041
- Gunmetal #293241 ΔE 0.047
- Dark Slate Gray #2F4F4F ΔE 0.053
- Midnight Green #073B4C ΔE 0.055
Use #373E45 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.