#171C4C
Closest named color: Dark Indigo (#1F0954). oklch(25.5% 0.088 273.9), rgb(23, 28, 76).
Aa
White text reads best on this color (16.06:1).
About this color
#171C4C is a dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.088 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.043 away. White text reads best on it, at 16.06:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.30:1 |
| White text | 16.06:1 |
Values
| HEX | #171C4C |
| RGB | rgb(23, 28, 76) |
| HSL | hsl(234, 54%, 19%) |
| OKLCH | oklch(25.5% 0.088 273.9) |
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 #171C4C | 16.06:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #171C4C | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #171C4C text on white | 16.06:1 | AAA | Lc 102.8 | Preferred for body text |
| #171C4C text on black | 1.30:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8497FF
oklch(70.7% 0.153 274)
-
Step 500
500
#6778FF
oklch(63% 0.199 273.8)
-
Step 600
600
#5159F7
oklch(55.7% 0.231 273.8)
-
Step 700
700
#4347D7
oklch(49.2% 0.215 274)
-
Step 800
800
#363CAE
oklch(42.8% 0.178 273.7)
-
Step 900
900
#2E3589
oklch(37.7% 0.138 274.1)
-
Step 950
950 (this color)
#171C4C
oklch(25.5% 0.088 273.9)
#171C4C 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) | #00244E | 0.030 |
| Deuteranopia (no green cones) | #001F4B | 0.026 |
| Tritanopia (no blue cones) | #002830 | 0.076 |
| Achromatopsia (no color) | #212121 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171C4C
#171C4C
oklch(25.5% 0.088 273.9)
- #2B2200
#2B2200
oklch(25.5% 0.052 94.3)
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 #171C4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.043
- Oxford Blue #1B263B ΔE 0.049
- Navy Blue #001146 ΔE 0.050
- Marine #042E60 ΔE 0.061
- Dark #1B2431 ΔE 0.062
- Midnight Blue #191970 ΔE 0.065
- Darkblue #030764 ΔE 0.067
- Rich Black #0D1B2A ΔE 0.068
Use #171C4C 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.