#181938
Closest named color: Rich Black (#0D1B2A). oklch(23.1% 0.059 279.4), rgb(24, 25, 56).
Aa
White text reads best on this color (17.00:1).
About this color
#181938 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.059 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.035 away. White text reads best on it, at 17.00:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 17.00:1 |
Values
| HEX | #181938 |
| RGB | rgb(24, 25, 56) |
| HSL | hsl(238, 40%, 16%) |
| OKLCH | oklch(23.1% 0.059 279.4) |
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 #181938 | 17.00:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #181938 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #181938 text on white | 17.00:1 | AAA | Lc 103.8 | Preferred for body text |
| #181938 text on black | 1.23:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B7BDEE
oklch(81% 0.069 279.3)
-
Step 400
400
#9299E5
oklch(70.7% 0.111 279.1)
-
Step 500
500
#797EDD
oklch(63.2% 0.141 279.3)
-
Step 600
600
#6365CB
oklch(55.7% 0.154 279.3)
-
Step 700
700
#5253B0
oklch(49.1% 0.145 279.2)
-
Step 800
800
#43448E
oklch(42.6% 0.12 279.5)
-
Step 900
900
#383A71
oklch(37.6% 0.093 279.4)
-
Step 950
950 (this color)
#181938
oklch(23.1% 0.059 279.4)
#181938 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) | #0C1D39 | 0.020 |
| Deuteranopia (no green cones) | #091B37 | 0.022 |
| Tritanopia (no blue cones) | #0C2025 | 0.053 |
| Achromatopsia (no color) | #1C1C1C | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181938
#181938
oklch(23.1% 0.059 279.4)
- #231D00
#231D00
oklch(23.1% 0.048 98.3)
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 #181938, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.035
- Dark #1B2431 ΔE 0.044
- Oxford Blue #1B263B ΔE 0.044
- Navy Blue #001146 ΔE 0.053
- Jet #212529 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.064
- Midnight Purple #280137 ΔE 0.066
- Very Dark Purple #2A0134 ΔE 0.068
Use #181938 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.