#051B23
Closest named color: Rich Black (#0D1B2A). oklch(20.9% 0.032 224.7), rgb(5, 27, 35).
Aa
White text reads best on this color (17.68:1).
About this color
#051B23 is a very dark, muted teal or cyan. In OKLCH its lightness is 21%, its chroma 0.032 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.018 away. White text reads best on it, at 17.68:1.
| Hue family | Teals and cyans |
| Lightness | very dark (21%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.68:1 |
Values
| HEX | #051B23 |
| RGB | rgb(5, 27, 35) |
| HSL | hsl(196, 75%, 8%) |
| OKLCH | oklch(20.9% 0.032 224.7) |
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 #051B23 | 17.68:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #051B23 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #051B23 text on white | 17.68:1 | AAA | Lc 104.4 | Preferred for body text |
| #051B23 text on black | 1.18:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CBDCE4
oklch(88.4% 0.021 227.6)
-
Step 300
300
#A7C6D3
oklch(80.8% 0.038 225.1)
-
Step 400
400
#77A9BD
oklch(70.7% 0.06 224.8)
-
Step 500
500
#5094AD
oklch(63.2% 0.078 224.2)
-
Step 600
600
#317E98
oklch(55.7% 0.084 223.9)
-
Step 700
700
#226A82
oklch(49.1% 0.079 224.3)
-
Step 800
800
#1F566A
oklch(42.6% 0.066 225.7)
-
Step 900
900
#204756
oklch(37.6% 0.051 225.8)
-
Step 950
950 (this color)
#051B23
oklch(20.9% 0.032 224.7)
#051B23 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) | #171A23 | 0.026 |
| Deuteranopia (no green cones) | #121723 | 0.022 |
| Tritanopia (no blue cones) | #001D1E | 0.016 |
| Achromatopsia (no color) | #181818 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #051B23
#051B23
oklch(20.9% 0.032 224.7)
- #24130B
#24130B
oklch(20.8% 0.032 45.7)
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 #051B23, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.018
- Rich Navy #001219 ΔE 0.040
- Dark #1B2431 ΔE 0.052
- Jet #212529 ΔE 0.059
- Almost Black #070D0D ΔE 0.061
- Oxford Blue #1B263B ΔE 0.066
- Navy Blue #001146 ΔE 0.079
- Dark Navy #000435 ΔE 0.088
Use #051B23 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.