#0B3F57
Closest named color: Midnight Green (#073B4C). oklch(34.8% 0.066 234.1), rgb(11, 63, 87).
Aa
White text reads best on this color (11.27:1).
About this color
#0B3F57 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.066 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.022 away. White text reads best on it, at 11.27:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.86:1 |
| White text | 11.27:1 |
Values
| HEX | #0B3F57 |
| RGB | rgb(11, 63, 87) |
| HSL | hsl(199, 78%, 19%) |
| OKLCH | oklch(34.8% 0.066 234.1) |
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 #0B3F57 | 11.27:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #0B3F57 | 1.86:1 | Fails | Lc 8.2 | Not readable |
| #0B3F57 text on white | 11.27:1 | AAA | Lc 95.7 | Preferred for body text |
| #0B3F57 text on black | 1.86:1 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A2C7DC
oklch(81% 0.049 233.1)
-
Step 400
400
#6DA9CB
oklch(70.7% 0.08 234.4)
-
Step 500
500
#4193BE
oklch(63.1% 0.102 234.6)
-
Step 600
600
#167DAA
oklch(55.7% 0.11 234.1)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#0B5676
oklch(42.7% 0.085 233.6)
-
Step 900
900 (this color)
#0B3F57
oklch(34.8% 0.066 234.1)
-
Step 950
950
#0F2A38
oklch(27.1% 0.042 233.9)
#0B3F57 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) | #333E58 | 0.041 |
| Deuteranopia (no green cones) | #293857 | 0.033 |
| Tritanopia (no blue cones) | #004547 | 0.040 |
| Achromatopsia (no color) | #3B3B3B | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3F57
#0B3F57
oklch(34.8% 0.066 234.1)
- #542F15
#542F15
oklch(34.7% 0.066 53.6)
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 #0B3F57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.022
- Prussian Blue #1D3557 ΔE 0.034
- Charcoal #264653 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.038
- Marine Blue #01386A ΔE 0.045
- Gunmetal #293241 ΔE 0.053
- Onyx #343A40 ΔE 0.054
Use #0B3F57 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.