#31384B
Closest named color: Onyx (#343A40). oklch(34.2% 0.035 268.8), rgb(49, 56, 75).
Aa
White text reads best on this color (11.68:1).
About this color
#31384B is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.035 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.023 away. White text reads best on it, at 11.68:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.79:1 |
| White text | 11.68:1 |
Values
| HEX | #31384B |
| RGB | rgb(49, 56, 75) |
| HSL | hsl(224, 21%, 24%) |
| OKLCH | oklch(34.2% 0.035 268.8) |
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 #31384B | 11.68:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #31384B | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #31384B text on white | 11.68:1 | AAA | Lc 96.8 | Preferred for body text |
| #31384B text on black | 1.79:1 | Fails | Lc 0.0 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D5D9E3
oklch(88.5% 0.014 268.5)
-
Step 300
300
#B9C0D2
oklch(80.8% 0.026 268.8)
-
Step 400
400
#96A0BB
oklch(70.7% 0.041 269.3)
-
Step 500
500
#7C89AB
oklch(63.2% 0.054 268.5)
-
Step 600
600
#657296
oklch(55.5% 0.058 269.1)
-
Step 700
700
#546080
oklch(49.2% 0.054 268.5)
-
Step 800
800
#454E68
oklch(42.7% 0.045 269.6)
-
Step 900
900 (this color)
#31384B
oklch(34.2% 0.035 268.8)
-
Step 950
950
#222631
oklch(27% 0.021 269.3)
#31384B 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) | #32394C | 0.004 |
| Deuteranopia (no green cones) | #30374B | 0.004 |
| Tritanopia (no blue cones) | #2A3C3E | 0.032 |
| Achromatopsia (no color) | #383838 | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31384B
#31384B
oklch(34.2% 0.035 268.8)
- #403823
#403823
oklch(34.3% 0.036 89.5)
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 #31384B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.023
- Dark Blue Grey #1F3B4D ΔE 0.024
- Gunmetal #293241 ΔE 0.028
- Prussian Blue #1D3557 ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.043
- Midnight Green #073B4C ΔE 0.043
- Charcoal #264653 ΔE 0.044
Use #31384B 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.