#00181A
Closest named color: Rich Navy (#001219). oklch(19% 0.032 202), rgb(0, 24, 26).
Aa
White text reads best on this color (18.33:1).
About this color
#00181A is a very dark, muted teal or cyan. In OKLCH its lightness is 19%, its chroma 0.032 and its hue 202°. 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 18.33:1.
| Hue family | Teals and cyans |
| Lightness | very dark (19%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.14:1 |
| White text | 18.33:1 |
Values
| HEX | #00181A |
| RGB | rgb(0, 24, 26) |
| HSL | hsl(185, 100%, 5%) |
| OKLCH | oklch(19% 0.032 202) |
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 #00181A | 18.33:1 | AAA | Lc -107.0 | Preferred for body text |
| Black text on #00181A | 1.14:1 | Fails | Lc 0.0 | Not readable |
| #00181A text on white | 18.33:1 | AAA | Lc 104.8 | Preferred for body text |
| #00181A 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
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CADEDF
oklch(88.6% 0.021 200.4)
-
Step 300
300
#A5C8CB
oklch(80.8% 0.038 202.8)
-
Step 400
400
#72ACB1
oklch(70.6% 0.061 202.7)
-
Step 500
500
#48989E
oklch(63.2% 0.078 201.9)
-
Step 600
600
#228289
oklch(55.7% 0.085 202.3)
-
Step 700
700
#116E74
oklch(49.2% 0.079 201.8)
-
Step 800
800
#14595E
oklch(42.6% 0.065 202.3)
-
Step 900
900
#1A4A4D
oklch(37.8% 0.051 200.9)
-
Step 950
950 (this color)
#00181A
oklch(19% 0.032 202)
#00181A 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) | #15161A | 0.033 |
| Deuteranopia (no green cones) | #11131A | 0.031 |
| Tritanopia (no blue cones) | #001A19 | 0.009 |
| Achromatopsia (no color) | #151515 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00181A
#00181A
oklch(19% 0.032 202)
- #200E0D
#200E0D
oklch(19% 0.031 23.8)
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 #00181A, 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 0.040
- Almost Black #070D0D ΔE 0.044
- Dark #1B2431 ΔE 0.073
- Jet #212529 ΔE 0.077
- Oxford Blue #1B263B ΔE 0.088
- Dark Navy #000435 ΔE 0.091
- Dark Navy Blue #00022E ΔE 0.093
Use #00181A 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.