#171843
Closest named color: Navy Blue (#001146). oklch(23.7% 0.079 277.5), rgb(23, 24, 67).
Aa
White text reads best on this color (16.82:1).
About this color
#171843 is a very dark, moderately saturated blue. In OKLCH its lightness is 24%, its chroma 0.079 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.042 away. White text reads best on it, at 16.82:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.24:1 |
| White text | 16.82:1 |
Values
| HEX | #171843 |
| RGB | rgb(23, 24, 67) |
| HSL | hsl(239, 49%, 18%) |
| OKLCH | oklch(23.7% 0.079 277.5) |
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 #171843 | 16.82:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #171843 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #171843 text on white | 16.82:1 | AAA | Lc 103.6 | Preferred for body text |
| #171843 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FD
oklch(93.7% 0.027 276.8)
-
Step 200
200
#D0D7FC
oklch(88.6% 0.052 276.9)
-
Step 300
300
#B1BBFD
oklch(80.8% 0.094 277.4)
-
Step 400
400
#8B95FD
oklch(70.7% 0.151 277.6)
-
Step 500
500
#7177FA
oklch(63.1% 0.192 277.4)
-
Step 600
600
#5C5BE9
oklch(55.6% 0.209 277.5)
-
Step 700
700
#4C49CB
oklch(49% 0.195 277.4)
-
Step 800
800
#3E3DA4
oklch(42.6% 0.161 277.5)
-
Step 900
900
#343682
oklch(37.7% 0.125 277.4)
-
Step 950
950 (this color)
#171843
oklch(23.7% 0.079 277.5)
#171843 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) | #001F44 | 0.032 |
| Deuteranopia (no green cones) | #001B42 | 0.030 |
| Tritanopia (no blue cones) | #00222A | 0.070 |
| Achromatopsia (no color) | #1D1D1D | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171843
#171843
oklch(23.7% 0.079 277.5)
- #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 #171843, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.042
- Dark Indigo #1F0954 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.051
- Rich Black #0D1B2A ΔE 0.054
- Dark #1B2431 ΔE 0.058
- Night Blue #040348 ΔE 0.064
- Midnight Purple #280137 ΔE 0.067
- Very Dark Purple #2A0134 ΔE 0.071
Use #171843 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.