#171F47
Closest named color: Oxford Blue (#1B263B). oklch(25.7% 0.075 271.6), rgb(23, 31, 71).
Aa
White text reads best on this color (15.86:1).
About this color
#171F47 is a dark, moderately saturated blue. In OKLCH its lightness is 26%, its chroma 0.075 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.036 away. White text reads best on it, at 15.86:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.32:1 |
| White text | 15.86:1 |
Values
| HEX | #171F47 |
| RGB | rgb(23, 31, 71) |
| HSL | hsl(230, 51%, 18%) |
| OKLCH | oklch(25.7% 0.075 271.6) |
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 #171F47 | 15.86:1 | AAA | Lc -105.3 | Preferred for body text |
| Black text on #171F47 | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #171F47 text on white | 15.86:1 | AAA | Lc 102.7 | Preferred for body text |
| #171F47 text on black | 1.32:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ACBEFB
oklch(81% 0.089 271.6)
-
Step 400
400
#8199F9
oklch(70.6% 0.143 271.7)
-
Step 500
500
#647DF6
oklch(63.2% 0.182 271.5)
-
Step 600
600
#4E62E5
oklch(55.6% 0.198 271.8)
-
Step 700
700
#3F50C7
oklch(49.1% 0.185 271.6)
-
Step 800
800
#3443A1
oklch(42.8% 0.152 271.5)
-
Step 900
900
#2C397F
oklch(37.5% 0.119 271.6)
-
Step 950
950 (this color)
#171F47
oklch(25.7% 0.075 271.6)
#171F47 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) | #092448 | 0.020 |
| Deuteranopia (no green cones) | #022046 | 0.024 |
| Tritanopia (no blue cones) | #00282F | 0.065 |
| Achromatopsia (no color) | #222222 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171F47
#171F47
oklch(25.7% 0.075 271.6)
- #2D2200
#2D2200
oklch(25.8% 0.053 90.8)
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 #171F47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.036
- Dark #1B2431 ΔE 0.049
- Dark Indigo #1F0954 ΔE 0.056
- Navy Blue #001146 ΔE 0.056
- Rich Black #0D1B2A ΔE 0.059
- Marine #042E60 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.061
- Jet #212529 ΔE 0.067
Use #171F47 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.