#171C45
Closest named color: Oxford Blue (#1B263B). oklch(24.8% 0.076 274.2), rgb(23, 28, 69).
Aa
White text reads best on this color (16.29:1).
About this color
#171C45 is a very dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.076 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.042 away. White text reads best on it, at 16.29:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.29:1 |
Values
| HEX | #171C45 |
| RGB | rgb(23, 28, 69) |
| HSL | hsl(233, 50%, 18%) |
| OKLCH | oklch(24.8% 0.076 274.2) |
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 #171C45 | 16.29:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #171C45 | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #171C45 text on white | 16.29:1 | AAA | Lc 103.1 | Preferred for body text |
| #171C45 text on black | 1.28:1 | 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
#CED7FB
oklch(88.4% 0.051 274.3)
-
Step 300
300
#AEBDFC
oklch(81% 0.091 273.9)
-
Step 400
400
#8698FA
oklch(70.8% 0.144 274.3)
-
Step 500
500
#6A7AF7
oklch(63% 0.185 274.3)
-
Step 600
600
#545FE6
oklch(55.5% 0.202 274.2)
-
Step 700
700
#454EC8
oklch(49.1% 0.187 274)
-
Step 800
800
#3941A2
oklch(42.8% 0.155 274.2)
-
Step 900
900
#303880
oklch(37.7% 0.12 274.3)
-
Step 950
950 (this color)
#171C45
oklch(24.8% 0.076 274.2)
#171C45 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) | #042246 | 0.026 |
| Deuteranopia (no green cones) | #001E44 | 0.027 |
| Tritanopia (no blue cones) | #00252D | 0.066 |
| Achromatopsia (no color) | #202020 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171C45
#171C45
oklch(24.8% 0.076 274.2)
- #292000
#292000
oklch(24.7% 0.051 93.6)
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 #171C45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.042
- Navy Blue #001146 ΔE 0.049
- Dark Indigo #1F0954 ΔE 0.050
- Dark #1B2431 ΔE 0.051
- Rich Black #0D1B2A ΔE 0.055
- Marine #042E60 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.069
- Jet #212529 ΔE 0.069
Use #171C45 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.