#001F43
Closest named color: Navy Blue (#001146). oklch(24.2% 0.077 254.2), rgb(0, 31, 67).
Aa
White text reads best on this color (16.44:1).
About this color
#001F43 is a very dark, moderately saturated blue. In OKLCH its lightness is 24%, its chroma 0.077 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.042 away. White text reads best on it, at 16.44:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.27:1 |
| White text | 16.44:1 |
Values
| HEX | #001F43 |
| RGB | rgb(0, 31, 67) |
| HSL | hsl(212, 100%, 13%) |
| OKLCH | oklch(24.2% 0.077 254.2) |
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 #001F43 | 16.44:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #001F43 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #001F43 text on white | 16.44:1 | AAA | Lc 103.0 | Preferred for body text |
| #001F43 text on black | 1.27:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DCFB
oklch(88.6% 0.051 253.9)
-
Step 300
300
#98C4FB
oklch(80.9% 0.091 254.3)
-
Step 400
400
#5BA3FA
oklch(70.7% 0.147 254.3)
-
Step 500
500
#1F89F7
oklch(63.2% 0.188 254.1)
-
Step 600
600
#0072D8
oklch(55.7% 0.178 254.2)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800
#004E97
oklch(42.8% 0.136 254.1)
-
Step 900
900
#00417F
oklch(37.8% 0.12 253.9)
-
Step 950
950 (this color)
#001F43
oklch(24.2% 0.077 254.2)
#001F43 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) | #0A2244 | 0.016 |
| Deuteranopia (no green cones) | #001C42 | 0.010 |
| Tritanopia (no blue cones) | #00282D | 0.058 |
| Achromatopsia (no color) | #1F1F1F | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001F43
#001F43
oklch(24.2% 0.077 254.2)
- #2E1B00
#2E1B00
oklch(24.1% 0.051 73.2)
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 #001F43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.042
- Oxford Blue #1B263B ΔE 0.045
- Rich Black #0D1B2A ΔE 0.048
- Dark #1B2431 ΔE 0.052
- Marine #042E60 ΔE 0.069
- Dark Indigo #1F0954 ΔE 0.069
- Night Blue #040348 ΔE 0.070
- Jet #212529 ΔE 0.071
Use #001F43 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.