#001F17
Closest named color: Rich Black (#0D1B2A). oklch(21.3% 0.041 172.5), rgb(0, 31, 23).
Aa
White text reads best on this color (17.37:1).
About this color
#001F17 is a very dark, muted teal or cyan. In OKLCH its lightness is 21%, its chroma 0.041 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.049 away. White text reads best on it, at 17.37:1.
| Hue family | Teals and cyans |
| Lightness | very dark (21%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.37:1 |
Values
| HEX | #001F17 |
| RGB | rgb(0, 31, 23) |
| HSL | hsl(165, 100%, 6%) |
| OKLCH | oklch(21.3% 0.041 172.5) |
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 #001F17 | 17.37:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #001F17 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #001F17 text on white | 17.37:1 | AAA | Lc 104.0 | Preferred for body text |
| #001F17 text on black | 1.20:1 | 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
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDE9
oklch(93.6% 0.014 174.2)
-
Step 200
200
#C8DFD7
oklch(88.4% 0.027 172.8)
-
Step 300
300
#A1CBBD
oklch(80.8% 0.049 172.7)
-
Step 400
400
#6BB19B
oklch(70.8% 0.078 171.9)
-
Step 500
500
#3B9D83
oklch(63.1% 0.1 172.4)
-
Step 600
600
#00876D
oklch(55.6% 0.107 172.9)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#114D3E
oklch(37.8% 0.065 172.2)
-
Step 950
950 (this color)
#001F17
oklch(21.3% 0.041 172.5)
#001F17 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) | #1E1C17 | 0.043 |
| Deuteranopia (no green cones) | #191918 | 0.040 |
| Tritanopia (no blue cones) | #001F1D | 0.012 |
| Achromatopsia (no color) | #1A1A1A | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #001F17
#001F17
oklch(21.3% 0.041 172.5)
- #27101B
#27101B
oklch(21.2% 0.042 351.2)
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 #001F17, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.049
- Rich Navy #001219 ΔE 0.055
- Jet #212529 ΔE 0.063
- Dark #1B2431 ΔE 0.065
- Dark Forest Green #002D04 ΔE 0.068
- Almost Black #070D0D ΔE 0.069
- Very Dark Green #062E03 ΔE 0.072
- Oxford Blue #1B263B ΔE 0.081
Use #001F17 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.