#051F37
Closest named color: Rich Black (#0D1B2A). oklch(23.4% 0.056 249.6), rgb(5, 31, 55).
Aa
White text reads best on this color (16.69:1).
About this color
#051F37 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.056 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.026 away. White text reads best on it, at 16.69:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.69:1 |
Values
| HEX | #051F37 |
| RGB | rgb(5, 31, 55) |
| HSL | hsl(209, 83%, 12%) |
| OKLCH | oklch(23.4% 0.056 249.6) |
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 #051F37 | 16.69:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #051F37 | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #051F37 text on white | 16.69:1 | AAA | Lc 103.4 | Preferred for body text |
| #051F37 text on black | 1.25:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#A0C5EB
oklch(81% 0.067 249.3)
-
Step 400
400
#6BA5E0
oklch(70.6% 0.106 249.9)
-
Step 500
500
#3E8ED8
oklch(63.2% 0.136 249.4)
-
Step 600
600
#1476C5
oklch(55.5% 0.148 249.6)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#0A518A
oklch(42.7% 0.114 249.6)
-
Step 900
900
#14446E
oklch(37.8% 0.088 249)
-
Step 950
950 (this color)
#051F37
oklch(23.4% 0.056 249.6)
#051F37 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) | #142038 | 0.019 |
| Deuteranopia (no green cones) | #0C1C37 | 0.012 |
| Tritanopia (no blue cones) | #002528 | 0.042 |
| Achromatopsia (no color) | #1E1E1E | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #051F37
#051F37
oklch(23.4% 0.056 249.6)
- #2D1900
#2D1900
oklch(23.5% 0.051 70.1)
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 #051F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.026
- Dark #1B2431 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.039
- Jet #212529 ΔE 0.054
- Navy Blue #001146 ΔE 0.055
- Rich Navy #001219 ΔE 0.072
- Space Cadet #2B2D42 ΔE 0.077
- Night Blue #040348 ΔE 0.081
Use #051F37 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.