#171940
Closest named color: Navy Blue (#001146). oklch(23.7% 0.073 277.1), rgb(23, 25, 64).
Aa
White text reads best on this color (16.80:1).
About this color
#171940 is a very dark, moderately saturated blue. In OKLCH its lightness is 24%, its chroma 0.073 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.045 away. White text reads best on it, at 16.80:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.24:1 |
| White text | 16.80:1 |
Values
| HEX | #171940 |
| RGB | rgb(23, 25, 64) |
| HSL | hsl(237, 47%, 17%) |
| OKLCH | oklch(23.7% 0.073 277.1) |
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 #171940 | 16.80:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #171940 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #171940 text on white | 16.80:1 | AAA | Lc 103.6 | Preferred for body text |
| #171940 text on black | 1.24:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7F9
oklch(88.5% 0.047 277.5)
-
Step 300
300
#B2BCF9
oklch(80.9% 0.087 277.1)
-
Step 400
400
#8C97F5
oklch(70.7% 0.137 277.2)
-
Step 500
500
#717AF1
oklch(63.1% 0.176 276.9)
-
Step 600
600
#5C5FE0
oklch(55.6% 0.192 277.1)
-
Step 700
700
#4C4EC2
oklch(49.1% 0.177 276.9)
-
Step 800
800
#3E409D
oklch(42.6% 0.148 277.2)
-
Step 900
900
#34387D
oklch(37.7% 0.115 276.9)
-
Step 950
950 (this color)
#171940
oklch(23.7% 0.073 277.1)
#171940 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) | #031F41 | 0.028 |
| Deuteranopia (no green cones) | #001C3F | 0.029 |
| Tritanopia (no blue cones) | #032229 | 0.064 |
| Achromatopsia (no color) | #1D1D1D | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171940
#171940
oklch(23.7% 0.073 277.1)
- #251E00
#251E00
oklch(23.6% 0.049 96.6)
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 #171940, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.046
- Rich Black #0D1B2A ΔE 0.048
- Dark Indigo #1F0954 ΔE 0.051
- Dark #1B2431 ΔE 0.052
- Midnight Purple #280137 ΔE 0.067
- Night Blue #040348 ΔE 0.068
- Jet #212529 ΔE 0.069
Use #171940 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.