#031F18
Closest named color: Rich Black (#0D1B2A). oklch(21.5% 0.037 173.5), rgb(3, 31, 24).
Aa
White text reads best on this color (17.31:1).
About this color
#031F18 is a very dark, muted teal or cyan. In OKLCH its lightness is 22%, its chroma 0.037 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.046 away. White text reads best on it, at 17.31:1.
| Hue family | Teals and cyans |
| Lightness | very dark (22%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.31:1 |
Values
| HEX | #031F18 |
| RGB | rgb(3, 31, 24) |
| HSL | hsl(165, 82%, 7%) |
| OKLCH | oklch(21.5% 0.037 173.5) |
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 #031F18 | 17.31:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #031F18 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #031F18 text on white | 17.31:1 | AAA | Lc 104.0 | Preferred for body text |
| #031F18 text on black | 1.21:1 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2EDE9
oklch(93.7% 0.013 172.4)
-
Step 200
200
#CADFD8
oklch(88.6% 0.024 173.8)
-
Step 300
300
#A4CABE
oklch(80.8% 0.044 174)
-
Step 400
400
#71AF9D
oklch(70.7% 0.07 173.9)
-
Step 500
500
#469B85
oklch(63.1% 0.089 173.9)
-
Step 600
600
#1E866E
oklch(55.7% 0.098 173)
-
Step 700
700
#0B715C
oklch(49.1% 0.091 173.4)
-
Step 800
800
#115C4B
oklch(42.6% 0.075 173.3)
-
Step 900
900
#194C3F
oklch(37.8% 0.059 173.3)
-
Step 950
950 (this color)
#031F18
oklch(21.5% 0.037 173.5)
#031F18 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) | #1E1C18 | 0.040 |
| Deuteranopia (no green cones) | #1A1919 | 0.039 |
| Tritanopia (no blue cones) | #001F1D | 0.010 |
| Achromatopsia (no color) | #1B1B1B | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031F18
#031F18
oklch(21.5% 0.037 173.5)
- #27121B
#27121B
oklch(21.6% 0.038 353.5)
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 #031F18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.046
- Rich Navy #001219 ΔE 0.055
- Jet #212529 ΔE 0.059
- Dark #1B2431 ΔE 0.061
- Dark Forest Green #002D04 ΔE 0.069
- Almost Black #070D0D ΔE 0.069
- Very Dark Green #062E03 ΔE 0.073
- Oxford Blue #1B263B ΔE 0.078
Use #031F18 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.