#373C4E
Closest named color: Onyx (#343A40). oklch(35.9% 0.032 272.6), rgb(55, 60, 78).
Aa
White text reads best on this color (10.94:1).
About this color
#373C4E is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.032 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.025 away. White text reads best on it, at 10.94:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #373C4E |
| RGB | rgb(55, 60, 78) |
| HSL | hsl(227, 17%, 26%) |
| OKLCH | oklch(35.9% 0.032 272.6) |
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 #373C4E | 10.94:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #373C4E | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #373C4E text on white | 10.94:1 | AAA | Lc 95.3 | Preferred for body text |
| #373C4E text on black | 1.91:1 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D6D9E2
oklch(88.6% 0.013 271.3)
-
Step 300
300
#BBC0D1
oklch(80.9% 0.024 272.8)
-
Step 400
400
#98A0B9
oklch(70.8% 0.038 271.4)
-
Step 500
500
#7F88A8
oklch(63.1% 0.049 272.6)
-
Step 600
600
#687293
oklch(55.6% 0.053 271.5)
-
Step 700
700
#575F7D
oklch(49.1% 0.049 272.9)
-
Step 800
800
#474E66
oklch(42.7% 0.041 271.9)
-
Step 900
900 (this color)
#373C4E
oklch(35.9% 0.032 272.6)
-
Step 950
950
#232631
oklch(27% 0.021 273)
#373C4E 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) | #373E4F | 0.006 |
| Deuteranopia (no green cones) | #353C4E | 0.003 |
| Tritanopia (no blue cones) | #313F42 | 0.028 |
| Achromatopsia (no color) | #3D3D3D | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373C4E
#373C4E
oklch(35.9% 0.032 272.6)
- #433D29
#433D29
oklch(36% 0.033 93.4)
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 #373C4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.025
- Charcoal Grey #3C4142 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.034
- Charcoal #264653 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.036
- Gunmetal #293241 ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.049
- Midnight Green #073B4C ΔE 0.053
Use #373C4E 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.