#031D19
Closest named color: Rich Black (#0D1B2A). oklch(20.9% 0.034 181.4), rgb(3, 29, 25).
Aa
White text reads best on this color (17.59:1).
About this color
#031D19 is a very dark, muted teal or cyan. In OKLCH its lightness is 21%, its chroma 0.034 and its hue 181°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.041 away. White text reads best on it, at 17.59:1.
| Hue family | Teals and cyans |
| Lightness | very dark (21%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.59:1 |
Values
| HEX | #031D19 |
| RGB | rgb(3, 29, 25) |
| HSL | hsl(171, 81%, 6%) |
| OKLCH | oklch(20.9% 0.034 181.4) |
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 #031D19 | 17.59:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #031D19 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #031D19 text on white | 17.59:1 | AAA | Lc 104.3 | Preferred for body text |
| #031D19 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEA
oklch(93.5% 0.011 182.9)
-
Step 200
200
#CADEDA
oklch(88.5% 0.022 182.5)
-
Step 300
300
#A5C9C2
oklch(80.8% 0.04 182.2)
-
Step 400
400
#73AEA3
oklch(70.7% 0.064 181.4)
-
Step 500
500
#4A9A8D
oklch(63.2% 0.081 181.6)
-
Step 600
600
#258477
oklch(55.6% 0.088 181.9)
-
Step 700
700
#157064
oklch(49.2% 0.082 181.5)
-
Step 800
800
#175B51
oklch(42.7% 0.068 181)
-
Step 900
900
#1B4B43
oklch(37.7% 0.054 180.6)
-
Step 950
950 (this color)
#031D19
oklch(20.9% 0.034 181.4)
#031D19 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) | #1B1B19 | 0.035 |
| Deuteranopia (no green cones) | #171819 | 0.033 |
| Tritanopia (no blue cones) | #001E1C | 0.006 |
| Achromatopsia (no color) | #191919 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031D19
#031D19
oklch(20.9% 0.034 181.4)
- #251117
#251117
oklch(20.9% 0.035 1.2)
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 #031D19, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.041
- Rich Navy #001219 ΔE 0.046
- Almost Black #070D0D ΔE 0.061
- Jet #212529 ΔE 0.062
- Dark #1B2431 ΔE 0.062
- Dark Forest Green #002D04 ΔE 0.077
- Oxford Blue #1B263B ΔE 0.078
- Very Dark Green #062E03 ΔE 0.082
Use #031D19 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.