#051921
Closest named color: Rich Black (#0D1B2A). oklch(20.1% 0.031 226.6), rgb(5, 25, 33).
Aa
White text reads best on this color (17.98:1).
About this color
#051921 is a very dark, muted teal or cyan. In OKLCH its lightness is 20%, its chroma 0.031 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.022 away. White text reads best on it, at 17.98:1.
| Hue family | Teals and cyans |
| Lightness | very dark (20%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 17.98:1 |
Values
| HEX | #051921 |
| RGB | rgb(5, 25, 33) |
| HSL | hsl(197, 74%, 7%) |
| OKLCH | oklch(20.1% 0.031 226.6) |
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 #051921 | 17.98:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #051921 | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #051921 text on white | 17.98:1 | AAA | Lc 104.6 | Preferred for body text |
| #051921 text on black | 1.16:1 | 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
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CCDCE4
oklch(88.5% 0.02 229.1)
-
Step 300
300
#A9C6D3
oklch(80.9% 0.036 226.7)
-
Step 400
400
#79A9BD
oklch(70.8% 0.059 225.7)
-
Step 500
500
#5593AC
oklch(63.1% 0.074 226.1)
-
Step 600
600
#377D98
oklch(55.6% 0.081 226.4)
-
Step 700
700
#296982
oklch(49.1% 0.076 227.3)
-
Step 800
800
#245669
oklch(42.8% 0.062 226)
-
Step 900
900
#234756
oklch(37.8% 0.049 227.3)
-
Step 950
950 (this color)
#051921
oklch(20.1% 0.031 226.6)
#051921 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) | #151821 | 0.023 |
| Deuteranopia (no green cones) | #111521 | 0.021 |
| Tritanopia (no blue cones) | #001B1C | 0.016 |
| Achromatopsia (no color) | #171717 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #051921
#051921
oklch(20.1% 0.031 226.6)
- #22120A
#22120A
oklch(20.2% 0.031 47)
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 #051921, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.022
- Rich Navy #001219 ΔE 0.032
- Almost Black #070D0D ΔE 0.054
- Dark #1B2431 ΔE 0.059
- Jet #212529 ΔE 0.065
- Oxford Blue #1B263B ΔE 0.073
- Navy Blue #001146 ΔE 0.080
- Dark Navy #000435 ΔE 0.084
Use #051921 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.