#171C3B
Closest named color: Oxford Blue (#1B263B). oklch(24% 0.059 274.2), rgb(23, 28, 59).
Aa
White text reads best on this color (16.59:1).
About this color
#171C3B is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.059 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.035 away. White text reads best on it, at 16.59:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.26:1 |
| White text | 16.59:1 |
Values
| HEX | #171C3B |
| RGB | rgb(23, 28, 59) |
| HSL | hsl(232, 44%, 16%) |
| OKLCH | oklch(24% 0.059 274.2) |
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 #171C3B | 16.59:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #171C3B | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #171C3B text on white | 16.59:1 | AAA | Lc 103.4 | Preferred for body text |
| #171C3B text on black | 1.26:1 | 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B2BEEF
oklch(80.9% 0.071 274)
-
Step 400
400
#8B9BE7
oklch(70.7% 0.113 274.1)
-
Step 500
500
#7080DF
oklch(63.1% 0.143 274.4)
-
Step 600
600
#5967CD
oklch(55.5% 0.157 274.3)
-
Step 700
700
#4955B1
oklch(48.9% 0.145 274.2)
-
Step 800
800
#3C4690
oklch(42.6% 0.121 274.3)
-
Step 900
900
#333C73
oklch(37.8% 0.094 274)
-
Step 950
950 (this color)
#171C3B
oklch(24% 0.059 274.2)
#171C3B 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) | #0E203C | 0.016 |
| Deuteranopia (no green cones) | #0A1D3A | 0.018 |
| Tritanopia (no blue cones) | #072328 | 0.053 |
| Achromatopsia (no color) | #1E1E1E | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171C3B
#171C3B
oklch(24% 0.059 274.2)
- #271F00
#271F00
oklch(24.2% 0.05 95.1)
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 #171C3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.035
- Rich Black #0D1B2A ΔE 0.037
- Dark #1B2431 ΔE 0.038
- Navy Blue #001146 ΔE 0.054
- Jet #212529 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.065
- Space Cadet #2B2D42 ΔE 0.068
- Midnight Purple #280137 ΔE 0.074
Use #171C3B 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.