#001731
Closest named color: Rich Black (#0D1B2A). oklch(20.3% 0.06 251.8), rgb(0, 23, 49).
Aa
White text reads best on this color (17.99:1).
About this color
#001731 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.060 and its hue 252°. 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 17.99:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 17.99:1 |
Values
| HEX | #001731 |
| RGB | rgb(0, 23, 49) |
| HSL | hsl(212, 100%, 10%) |
| OKLCH | oklch(20.3% 0.06 251.8) |
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 #001731 | 17.99:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #001731 | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #001731 text on white | 17.99:1 | AAA | Lc 104.5 | Preferred for body text |
| #001731 text on black | 1.16:1 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DCF3
oklch(88.6% 0.039 250.7)
-
Step 300
300
#9FC4EE
oklch(80.8% 0.072 251.9)
-
Step 400
400
#69A5E6
oklch(70.8% 0.115 251.5)
-
Step 500
500
#3C8CDE
oklch(63% 0.146 251.8)
-
Step 600
600
#1075CC
oklch(55.7% 0.158 251.5)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#07508F
oklch(42.7% 0.122 251.6)
-
Step 900
900
#134372
oklch(37.7% 0.095 251.6)
-
Step 950
950 (this color)
#001731
oklch(20.3% 0.06 251.8)
#001731 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) | #091932 | 0.015 |
| Deuteranopia (no green cones) | #011430 | 0.010 |
| Tritanopia (no blue cones) | #001D21 | 0.043 |
| Achromatopsia (no color) | #171717 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001731
#001731
oklch(20.3% 0.06 251.8)
- #231300
#231300
oklch(20.4% 0.044 71.8)
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 #001731, 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 0.045
- Rich Navy #001219 ΔE 0.050
- Dark Navy #000435 ΔE 0.058
- Dark #1B2431 ΔE 0.064
- Night Blue #040348 ΔE 0.065
- Oxford Blue #1B263B ΔE 0.069
- Dark Navy Blue #00022E ΔE 0.069
Use #001731 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.