#051B3C
Closest named color: Rich Black (#0D1B2A). oklch(22.7% 0.07 258.2), rgb(5, 27, 60).
Aa
White text reads best on this color (17.09:1).
About this color
#051B3C is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.070 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.036 away. White text reads best on it, at 17.09:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.09:1 |
Values
| HEX | #051B3C |
| RGB | rgb(5, 27, 60) |
| HSL | hsl(216, 85%, 13%) |
| OKLCH | oklch(22.7% 0.07 258.2) |
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 #051B3C | 17.09:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #051B3C | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #051B3C text on white | 17.09:1 | AAA | Lc 103.8 | Preferred for body text |
| #051B3C text on black | 1.22:1 | 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
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#A0C3F6
oklch(81% 0.082 257.7)
-
Step 400
400
#6BA1F2
oklch(70.6% 0.133 258.3)
-
Step 500
500
#4287ED
oklch(63% 0.169 258.3)
-
Step 600
600
#206EDC
oklch(55.5% 0.184 258.4)
-
Step 700
700
#115CBF
oklch(49.2% 0.17 258.1)
-
Step 800
800
#134B9A
oklch(42.6% 0.141 258.4)
-
Step 900
900
#17407B
oklch(37.8% 0.11 258.1)
-
Step 950
950 (this color)
#051B3C
oklch(22.7% 0.07 258.2)
#051B3C 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) | #081E3D | 0.011 |
| Deuteranopia (no green cones) | #00193B | 0.010 |
| Tritanopia (no blue cones) | #002328 | 0.054 |
| Achromatopsia (no color) | #1C1C1C | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #051B3C
#051B3C
oklch(22.7% 0.07 258.2)
- #281900
#281900
oklch(22.7% 0.047 78.6)
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 #051B3C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.036
- Navy Blue #001146 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.050
- Dark #1B2431 ΔE 0.052
- Night Blue #040348 ΔE 0.064
- Dark Indigo #1F0954 ΔE 0.069
- Jet #212529 ΔE 0.070
- Dark Navy #000435 ΔE 0.073
Use #051B3C 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.