#051F43
Closest named color: Oxford Blue (#1B263B). oklch(24.4% 0.075 257.3), rgb(5, 31, 67).
Aa
White text reads best on this color (16.36:1).
About this color
#051F43 is a very dark, moderately saturated blue. In OKLCH its lightness is 24%, its chroma 0.075 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.042 away. White text reads best on it, at 16.36:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.36:1 |
Values
| HEX | #051F43 |
| RGB | rgb(5, 31, 67) |
| HSL | hsl(215, 86%, 14%) |
| OKLCH | oklch(24.4% 0.075 257.3) |
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 #051F43 | 16.36:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #051F43 | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #051F43 text on white | 16.36:1 | AAA | Lc 103.0 | Preferred for body text |
| #051F43 text on black | 1.28:1 | 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
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9CC3FA
oklch(80.9% 0.089 257)
-
Step 400
400
#65A1F8
oklch(70.6% 0.143 257.7)
-
Step 500
500
#3687F5
oklch(63.1% 0.182 257.3)
-
Step 600
600
#046DE4
oklch(55.6% 0.199 257.5)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#014BA0
oklch(42.8% 0.152 257.2)
-
Step 900
900
#0F3F7F
oklch(37.6% 0.119 257.5)
-
Step 950
950 (this color)
#051F43
oklch(24.4% 0.075 257.3)
#051F43 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) | #0A2344 | 0.015 |
| Deuteranopia (no green cones) | #001D42 | 0.010 |
| Tritanopia (no blue cones) | #00282D | 0.059 |
| Achromatopsia (no color) | #202020 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #051F43
#051F43
oklch(24.4% 0.075 257.3)
- #2D1C00
#2D1C00
oklch(24.2% 0.051 77.2)
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 #051F43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.042
- Navy Blue #001146 ΔE 0.044
- Rich Black #0D1B2A ΔE 0.048
- Dark #1B2431 ΔE 0.049
- Dark Indigo #1F0954 ΔE 0.067
- Marine #042E60 ΔE 0.067
- Jet #212529 ΔE 0.068
- Night Blue #040348 ΔE 0.072
Use #051F43 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.