#373D4E
Closest named color: Onyx (#343A40). oklch(36.2% 0.031 269.7), rgb(55, 61, 78).
Aa
White text reads best on this color (10.82:1).
About this color
#373D4E is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.031 and its hue 270°. 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 10.82:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.93:1 |
| White text | 10.82:1 |
Values
| HEX | #373D4E |
| RGB | rgb(55, 61, 78) |
| HSL | hsl(224, 17%, 26%) |
| OKLCH | oklch(36.2% 0.031 269.7) |
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 #373D4E | 10.82:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #373D4E | 1.93:1 | Fails | Lc 8.8 | Not readable |
| #373D4E text on white | 10.82:1 | AAA | Lc 95.1 | Preferred for body text |
| #373D4E 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D6D9E2
oklch(88.6% 0.013 271.3)
-
Step 300
300
#BBC0D0
oklch(80.9% 0.023 272)
-
Step 400
400
#97A0B8
oklch(70.7% 0.037 269.2)
-
Step 500
500
#7E89A7
oklch(63.2% 0.047 269.2)
-
Step 600
600
#677292
oklch(55.5% 0.052 269.9)
-
Step 700
700
#56607C
oklch(49.2% 0.047 269.4)
-
Step 800
800
#464E65
oklch(42.6% 0.04 269.7)
-
Step 900
900 (this color)
#373D4E
oklch(36.2% 0.031 269.7)
-
Step 950
950
#232630
oklch(27% 0.019 272)
#373D4E 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) | #383E4F | 0.004 |
| Deuteranopia (no green cones) | #363C4E | 0.004 |
| Tritanopia (no blue cones) | #314043 | 0.026 |
| Achromatopsia (no color) | #3D3D3D | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373D4E
#373D4E
oklch(36.2% 0.031 269.7)
- #443D2B
#443D2B
oklch(36.2% 0.031 89.3)
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 #373D4E, 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 0.029
- Charcoal #264653 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.034
- Gunmetal #293241 ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.051
- Midnight Green #073B4C ΔE 0.053
Use #373D4E 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.