#171F3C
Closest named color: Oxford Blue (#1B263B). oklch(24.8% 0.056 270.3), rgb(23, 31, 60).
Aa
White text reads best on this color (16.18:1).
About this color
#171F3C is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.056 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.026 away. White text reads best on it, at 16.18:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.18:1 |
Values
| HEX | #171F3C |
| RGB | rgb(23, 31, 60) |
| HSL | hsl(227, 45%, 16%) |
| OKLCH | oklch(24.8% 0.056 270.3) |
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 #171F3C | 16.18:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #171F3C | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #171F3C text on white | 16.18:1 | AAA | Lc 103.1 | Preferred for body text |
| #171F3C text on black | 1.29:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#CFD9F2
oklch(88.5% 0.036 268.3)
-
Step 300
300
#B0BFED
oklch(80.9% 0.067 270.7)
-
Step 400
400
#879DE3
oklch(70.7% 0.106 270.2)
-
Step 500
500
#6A83DB
oklch(63.1% 0.136 270.2)
-
Step 600
600
#536BC9
oklch(55.6% 0.148 270.2)
-
Step 700
700
#4459AE
oklch(49.2% 0.137 270.3)
-
Step 800
800
#38498D
oklch(42.8% 0.114 270.4)
-
Step 900
900
#303E70
oklch(37.8% 0.087 270)
-
Step 950
950 (this color)
#171F3C
oklch(24.8% 0.056 270.3)
#171F3C 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) | #13223D | 0.010 |
| Deuteranopia (no green cones) | #0F1F3B | 0.011 |
| Tritanopia (no blue cones) | #05252A | 0.050 |
| Achromatopsia (no color) | #212121 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171F3C
#171F3C
oklch(24.8% 0.056 270.3)
- #2B2000
#2B2000
oklch(25% 0.051 90)
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 #171F3C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.026
- Dark #1B2431 ΔE 0.031
- Rich Black #0D1B2A ΔE 0.040
- Jet #212529 ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.060
- Navy Blue #001146 ΔE 0.061
- Dark Indigo #1F0954 ΔE 0.070
- Gunmetal #293241 ΔE 0.072
Use #171F3C 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.