#051837
Closest named color: Rich Black (#0D1B2A). oklch(21.5% 0.066 259.2), rgb(5, 24, 55).
Aa
White text reads best on this color (17.61:1).
About this color
#051837 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.066 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.031 away. White text reads best on it, at 17.61:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.61:1 |
Values
| HEX | #051837 |
| RGB | rgb(5, 24, 55) |
| HSL | hsl(217, 83%, 12%) |
| OKLCH | oklch(21.5% 0.066 259.2) |
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 #051837 | 17.61:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #051837 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #051837 text on white | 17.61:1 | AAA | Lc 104.2 | Preferred for body text |
| #051837 text on black | 1.19:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DAF6
oklch(88.4% 0.043 259.2)
-
Step 300
300
#A3C2F3
oklch(80.9% 0.077 259.4)
-
Step 400
400
#70A1EE
oklch(70.7% 0.125 259.1)
-
Step 500
500
#4A87E8
oklch(63% 0.16 259.3)
-
Step 600
600
#2C6FD6
oklch(55.6% 0.172 259.1)
-
Step 700
700
#1E5CBA
oklch(49.1% 0.161 259.1)
-
Step 800
800
#1B4C96
oklch(42.7% 0.133 258.9)
-
Step 900
900
#1C4078
oklch(37.7% 0.104 259.1)
-
Step 950
950 (this color)
#051837
oklch(21.5% 0.066 259.2)
#051837 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) | #071B38 | 0.011 |
| Deuteranopia (no green cones) | #001736 | 0.009 |
| Tritanopia (no blue cones) | #001F24 | 0.050 |
| Achromatopsia (no color) | #191919 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #051837
#051837
oklch(21.5% 0.066 259.2)
- #241600
#241600
oklch(21.3% 0.044 78.3)
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 #051837, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Navy Blue #001146 ΔE 0.037
- Dark #1B2431 ΔE 0.058
- Oxford Blue #1B263B ΔE 0.060
- Night Blue #040348 ΔE 0.060
- Dark Navy #000435 ΔE 0.063
- Rich Navy #001219 ΔE 0.064
- Dark Indigo #1F0954 ΔE 0.074
Use #051837 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.