#001B37
Closest named color: Rich Black (#0D1B2A). oklch(22% 0.064 251.2), rgb(0, 27, 55).
Aa
White text reads best on this color (17.32:1).
About this color
#001B37 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.064 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.029 away. White text reads best on it, at 17.32:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.32:1 |
Values
| HEX | #001B37 |
| RGB | rgb(0, 27, 55) |
| HSL | hsl(211, 100%, 11%) |
| OKLCH | oklch(22% 0.064 251.2) |
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 #001B37 | 17.32:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #001B37 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #001B37 text on white | 17.32:1 | AAA | Lc 103.9 | Preferred for body text |
| #001B37 text on black | 1.21:1 | 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 950.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9CC5F1
oklch(81% 0.076 250.6)
-
Step 400
400
#64A5EA
oklch(70.7% 0.122 251.2)
-
Step 500
500
#328CE3
oklch(63% 0.156 251.2)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#0B4375
oklch(37.8% 0.101 251)
-
Step 950
950 (this color)
#001B37
oklch(22% 0.064 251.2)
#001B37 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) | #0C1D38 | 0.017 |
| Deuteranopia (no green cones) | #021836 | 0.010 |
| Tritanopia (no blue cones) | #002226 | 0.047 |
| Achromatopsia (no color) | #1A1A1A | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001B37
#001B37
oklch(22% 0.064 251.2)
- #281600
#281600
oklch(22% 0.047 70.9)
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 #001B37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.029
- Navy Blue #001146 ΔE 0.042
- Dark #1B2431 ΔE 0.053
- Oxford Blue #1B263B ΔE 0.055
- Rich Navy #001219 ΔE 0.065
- Night Blue #040348 ΔE 0.068
- Jet #212529 ΔE 0.069
- Dark Navy #000435 ΔE 0.070
Use #001B37 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.