#18184F
Closest named color: Dark Indigo (#1F0954). oklch(25% 0.098 276.6), rgb(24, 24, 79).
Aa
White text reads best on this color (16.37:1).
About this color
#18184F is a very dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.098 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.032 away. White text reads best on it, at 16.37:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.28:1 |
| White text | 16.37:1 |
Values
| HEX | #18184F |
| RGB | rgb(24, 24, 79) |
| HSL | hsl(240, 53%, 20%) |
| OKLCH | oklch(25% 0.098 276.6) |
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 #18184F | 16.37:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #18184F | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #18184F text on white | 16.37:1 | AAA | Lc 103.0 | Preferred for body text |
| #18184F text on black | 1.28:1 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CFD7FF
oklch(88.6% 0.056 276.3)
-
Step 300
300
#B0BBFF
oklch(80.8% 0.097 276.9)
-
Step 400
400
#8995FF
oklch(70.7% 0.154 276.8)
-
Step 500
500
#6E76FF
oklch(63.1% 0.2 276.5)
-
Step 600
600
#5851FF
oklch(55.6% 0.248 276.5)
-
Step 700
700
#4A3BE4
oklch(49.1% 0.241 276.7)
-
Step 800
800
#3C33B8
oklch(42.7% 0.199 276.8)
-
Step 900
900
#313091
oklch(37.7% 0.155 276.4)
-
Step 950
950 (this color)
#18184F
oklch(25% 0.098 276.6)
#18184F 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) | #002251 | 0.035 |
| Deuteranopia (no green cones) | #001D4E | 0.029 |
| Tritanopia (no blue cones) | #002630 | 0.083 |
| Achromatopsia (no color) | #202020 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18184F
#18184F
oklch(25% 0.098 276.6)
- #292100
#292100
oklch(25% 0.051 95.7)
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 #18184F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.032
- Navy Blue #001146 ΔE 0.047
- Darkblue #030764 ΔE 0.059
- Midnight Blue #191970 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.061
- Night Blue #040348 ΔE 0.065
- Marine #042E60 ΔE 0.067
- Dark Royal Blue #02066F ΔE 0.071
Use #18184F 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.