#00181D
Closest named color: Rich Navy (#001219). oklch(19.2% 0.034 212.4), rgb(0, 24, 29).
Aa
White text reads best on this color (18.28:1).
About this color
#00181D is a very dark, muted teal or cyan. In OKLCH its lightness is 19%, its chroma 0.034 and its hue 212°. 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 18.28:1.
| Hue family | Teals and cyans |
| Lightness | very dark (19%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.14:1 |
| White text | 18.28:1 |
Values
| HEX | #00181D |
| RGB | rgb(0, 24, 29) |
| HSL | hsl(190, 100%, 6%) |
| OKLCH | oklch(19.2% 0.034 212.4) |
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 #00181D | 18.28:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #00181D | 1.14:1 | Fails | Lc 0.0 | Not readable |
| #00181D text on white | 18.28:1 | AAA | Lc 104.8 | Preferred for body text |
| #00181D text on black | 1.14:1 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#C9DDE2
oklch(88.4% 0.022 214.4)
-
Step 300
300
#A4C8D0
oklch(80.9% 0.04 212.7)
-
Step 400
400
#71ABB8
oklch(70.6% 0.063 213.3)
-
Step 500
500
#4796A6
oklch(63% 0.081 212.8)
-
Step 600
600
#208192
oklch(55.7% 0.088 212.4)
-
Step 700
700
#0F6D7C
oklch(49.2% 0.082 211.9)
-
Step 800
800
#135965
oklch(42.8% 0.068 212)
-
Step 900
900
#194952
oklch(37.7% 0.053 212.1)
-
Step 950
950 (this color)
#00181D
oklch(19.2% 0.034 212.4)
#00181D 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) | #14171D | 0.030 |
| Deuteranopia (no green cones) | #10131D | 0.029 |
| Tritanopia (no blue cones) | #001A1A | 0.012 |
| Achromatopsia (no color) | #151515 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00181D
#00181D
oklch(19.2% 0.034 212.4)
- #210E0A
#210E0A
oklch(19.1% 0.034 32.9)
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 #00181D, 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 0.035
- Almost Black #070D0D ΔE 0.046
- Dark #1B2431 ΔE 0.070
- Jet #212529 ΔE 0.075
- Oxford Blue #1B263B ΔE 0.084
- Dark Navy #000435 ΔE 0.086
- Navy Blue #001146 ΔE 0.087
Use #00181D 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.