#00181F
Closest named color: Rich Navy (#001219). oklch(19.3% 0.035 218.8), rgb(0, 24, 31).
Aa
White text reads best on this color (18.25:1).
About this color
#00181F is a very dark, muted teal or cyan. In OKLCH its lightness is 19%, its chroma 0.035 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.024 away. White text reads best on it, at 18.25:1.
| Hue family | Teals and cyans |
| Lightness | very dark (19%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.15:1 |
| White text | 18.25:1 |
Values
| HEX | #00181F |
| RGB | rgb(0, 24, 31) |
| HSL | hsl(194, 100%, 6%) |
| OKLCH | oklch(19.3% 0.035 218.8) |
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 #00181F | 18.25:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #00181F | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #00181F text on white | 18.25:1 | AAA | Lc 104.8 | Preferred for body text |
| #00181F text on black | 1.15:1 | 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
#C9DDE3
oklch(88.4% 0.023 217.7)
-
Step 300
300
#A4C8D3
oklch(81% 0.041 218.3)
-
Step 400
400
#70ABBD
oklch(70.7% 0.067 219.1)
-
Step 500
500
#4696AC
oklch(63.2% 0.084 218.5)
-
Step 600
600
#1F8098
oklch(55.7% 0.092 218.9)
-
Step 700
700
#0D6C81
oklch(49.2% 0.085 218.2)
-
Step 800
800
#125869
oklch(42.7% 0.071 218.6)
-
Step 900
900
#194855
oklch(37.6% 0.055 219.3)
-
Step 950
950 (this color)
#00181F
oklch(19.3% 0.035 218.8)
#00181F 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) | #14171F | 0.030 |
| Deuteranopia (no green cones) | #0F141F | 0.025 |
| Tritanopia (no blue cones) | #001A1A | 0.015 |
| Achromatopsia (no color) | #151515 | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00181F
#00181F
oklch(19.3% 0.035 218.8)
- #220F08
#220F08
oklch(19.5% 0.035 41.1)
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 #00181F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.024
- Rich Black #0D1B2A ΔE 0.032
- Almost Black #070D0D ΔE 0.048
- Dark #1B2431 ΔE 0.068
- Jet #212529 ΔE 0.074
- Oxford Blue #1B263B ΔE 0.082
- Dark Navy #000435 ΔE 0.082
- Navy Blue #001146 ΔE 0.083
Use #00181F 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.