#171B44
Closest named color: Oxford Blue (#1B263B). oklch(24.5% 0.076 275.1), rgb(23, 27, 68).
Aa
White text reads best on this color (16.44:1).
About this color
#171B44 is a very dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.076 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.043 away. White text reads best on it, at 16.44:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.27:1 |
| White text | 16.44:1 |
Values
| HEX | #171B44 |
| RGB | rgb(23, 27, 68) |
| HSL | hsl(235, 49%, 18%) |
| OKLCH | oklch(24.5% 0.076 275.1) |
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 #171B44 | 16.44:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #171B44 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #171B44 text on white | 16.44:1 | AAA | Lc 103.2 | Preferred for body text |
| #171B44 text on black | 1.27:1 | 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
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#AFBCFB
oklch(80.8% 0.09 275.2)
-
Step 400
400
#8797FA
oklch(70.7% 0.145 275.1)
-
Step 500
500
#6C7AF7
oklch(63.2% 0.185 275)
-
Step 600
600
#565FE6
oklch(55.6% 0.201 274.9)
-
Step 700
700
#474DC8
oklch(49.1% 0.188 275)
-
Step 800
800
#3A40A1
oklch(42.6% 0.154 275)
-
Step 900
900
#313880
oklch(37.7% 0.12 274.9)
-
Step 950
950 (this color)
#171B44
oklch(24.5% 0.076 275.1)
#171B44 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) | #032145 | 0.027 |
| Deuteranopia (no green cones) | #001D43 | 0.028 |
| Tritanopia (no blue cones) | #00242C | 0.066 |
| Achromatopsia (no color) | #1F1F1F | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171B44
#171B44
oklch(24.5% 0.076 275.1)
- #282000
#282000
oklch(24.6% 0.05 95.4)
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 #171B44, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.043
- Navy Blue #001146 ΔE 0.047
- Dark Indigo #1F0954 ΔE 0.049
- Dark #1B2431 ΔE 0.052
- Rich Black #0D1B2A ΔE 0.054
- Jet #212529 ΔE 0.070
- Night Blue #040348 ΔE 0.071
- Space Cadet #2B2D42 ΔE 0.071
Use #171B44 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.