#171A4C
Closest named color: Dark Indigo (#1F0954). oklch(25% 0.091 275.1), rgb(23, 26, 76).
Aa
White text reads best on this color (16.29:1).
About this color
#171A4C is a dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.091 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.039 away. White text reads best on it, at 16.29:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.28:1 |
| White text | 16.29:1 |
Values
| HEX | #171A4C |
| RGB | rgb(23, 26, 76) |
| HSL | hsl(237, 54%, 19%) |
| OKLCH | oklch(25% 0.091 275.1) |
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 #171A4C | 16.29:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #171A4C | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #171A4C text on white | 16.29:1 | AAA | Lc 103.0 | Preferred for body text |
| #171A4C 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8696FF
oklch(70.7% 0.154 275.2)
-
Step 500
500
#6A77FF
oklch(63% 0.2 275)
-
Step 600
600
#5455FB
oklch(55.6% 0.24 275.1)
-
Step 700
700
#4643DB
oklch(49.1% 0.223 275.2)
-
Step 800
800
#3939B1
oklch(42.8% 0.185 275.3)
-
Step 900
900
#2F338C
oklch(37.6% 0.145 275)
-
Step 950
950 (this color)
#171A4C
oklch(25% 0.091 275.1)
#171A4C 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) | #00224E | 0.031 |
| Deuteranopia (no green cones) | #001E4B | 0.027 |
| Tritanopia (no blue cones) | #002630 | 0.075 |
| Achromatopsia (no color) | #202020 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171A4C
#171A4C
oklch(25% 0.091 275.1)
- #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 #171A4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.039
- Navy Blue #001146 ΔE 0.046
- Oxford Blue #1B263B ΔE 0.054
- Darkblue #030764 ΔE 0.064
- Midnight Blue #191970 ΔE 0.065
- Marine #042E60 ΔE 0.065
- Dark #1B2431 ΔE 0.065
- Night Blue #040348 ΔE 0.068
Use #171A4C 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.