#173286
Closest named color: Twilight Blue (#0A437A). oklch(35.6% 0.144 265.6), rgb(23, 50, 134).
Aa
White text reads best on this color (11.43:1).
About this color
#173286 is a dark, vivid blue. In OKLCH its lightness is 36%, its chroma 0.144 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.052 away. White text reads best on it, at 11.43:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.83:1 |
| White text | 11.43:1 |
Values
| HEX | #173286 |
| RGB | rgb(23, 50, 134) |
| HSL | hsl(225, 71%, 31%) |
| OKLCH | oklch(35.6% 0.144 265.6) |
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 #173286 | 11.43:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #173286 | 1.83:1 | Fails | Lc 8.2 | Not readable |
| #173286 text on white | 11.43:1 | AAA | Lc 95.7 | Preferred for body text |
| #173286 text on black | 1.83:1 | 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 900.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#2E5FFD
oklch(55.7% 0.24 265.5)
-
Step 700
700
#234CDD
oklch(49.1% 0.224 265.7)
-
Step 800
800
#1D40B2
oklch(42.7% 0.185 265.5)
-
Step 900
900 (this color)
#173286
oklch(35.6% 0.144 265.6)
-
Step 950
950
#112252
oklch(27% 0.091 265.8)
#173286 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) | #003F89 | 0.034 |
| Deuteranopia (no green cones) | #003584 | 0.015 |
| Tritanopia (no blue cones) | #004857 | 0.112 |
| Achromatopsia (no color) | #3A3A3A | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173286
#173286
oklch(35.6% 0.144 265.6)
- #4D3800
#4D3800
oklch(35.5% 0.073 85)
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 #173286, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.052
- Marine Blue #01386A ΔE 0.054
- Royal #0C1793 ΔE 0.058
- Cobalt #1E488F ΔE 0.062
- Sapphire #2138AB ΔE 0.065
- Marine #042E60 ΔE 0.069
- Midnight Blue #191970 ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.078
Use #173286 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.