#173C76
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.108 259.3), rgb(23, 60, 118).
Aa
White text reads best on this color (10.80:1).
About this color
#173C76 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.108 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.021 away. White text reads best on it, at 10.80:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #173C76 |
| RGB | rgb(23, 60, 118) |
| HSL | hsl(217, 67%, 28%) |
| OKLCH | oklch(36.4% 0.108 259.3) |
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 #173C76 | 10.80:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #173C76 | 1.94:1 | Fails | Lc 9.3 | Not readable |
| #173C76 text on white | 10.80:1 | AAA | Lc 94.7 | Preferred for body text |
| #173C76 text on black | 1.94:1 | Fails | Lc -7.9 | 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 900.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A2C2F5
oklch(80.9% 0.081 259.6)
-
Step 400
400
#6EA1F1
oklch(70.7% 0.13 259.1)
-
Step 500
500
#4787EC
oklch(63.1% 0.166 259.2)
-
Step 600
600
#286EDA
oklch(55.6% 0.18 259.3)
-
Step 700
700
#1A5BBD
oklch(49% 0.167 259.2)
-
Step 800
800
#184B99
oklch(42.7% 0.139 259.2)
-
Step 900
900 (this color)
#173C76
oklch(36.4% 0.108 259.3)
-
Step 950
950
#102647
oklch(27% 0.068 258.4)
#173C76 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) | #1C4278 | 0.019 |
| Deuteranopia (no green cones) | #023975 | 0.017 |
| Tritanopia (no blue cones) | #004A53 | 0.084 |
| Achromatopsia (no color) | #3D3D3D | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173C76
#173C76
oklch(36.4% 0.108 259.3)
- #533900
#533900
oklch(36.5% 0.076 80)
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 #173C76, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.021
- Marine Blue #01386A ΔE 0.029
- Cobalt #1E488F ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.055
- Marine #042E60 ΔE 0.058
- Light Navy #155084 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.065
- Deep Sea Blue #015482 ΔE 0.071
Use #173C76 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.