#173550
Closest named color: Prussian Blue (#1D3557). oklch(32% 0.06 248), rgb(23, 53, 80).
Aa
White text reads best on this color (12.63:1).
About this color
#173550 is a dark, muted blue. In OKLCH its lightness is 32%, its chroma 0.060 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.015 away. White text reads best on it, at 12.63:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.66:1 |
| White text | 12.63:1 |
Values
| HEX | #173550 |
| RGB | rgb(23, 53, 80) |
| HSL | hsl(208, 55%, 20%) |
| OKLCH | oklch(32% 0.06 248) |
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 #173550 | 12.63:1 | AAA | Lc -101.9 | Preferred for body text |
| Black text on #173550 | 1.66:1 | Fails | Lc 0.0 | Not readable |
| #173550 text on white | 12.63:1 | AAA | Lc 98.5 | Preferred for body text |
| #173550 text on black | 1.66:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#DFEBF7
oklch(93.5% 0.021 248.1)
-
Step 200
200
#C5DCF3
oklch(88.5% 0.04 248.3)
-
Step 300
300
#9CC5ED
oklch(80.8% 0.072 248.1)
-
Step 400
400
#63A6E4
oklch(70.6% 0.114 248)
-
Step 500
500
#308EDD
oklch(63% 0.147 248.3)
-
Step 600
600
#0077C5
oklch(55.6% 0.149 247.9)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#094471
oklch(37.7% 0.095 248)
-
Step 950
950 (this color)
#173550
oklch(32% 0.06 248)
#173550 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) | #293651 | 0.023 |
| Deuteranopia (no green cones) | #21314F | 0.016 |
| Tritanopia (no blue cones) | #003B3F | 0.045 |
| Achromatopsia (no color) | #333333 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173550
#173550
oklch(32% 0.06 248)
- #472C0B
#472C0B
oklch(32% 0.061 67.4)
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 #173550, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.015
- Midnight Green #073B4C ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.025
- Gunmetal #293241 ΔE 0.032
- Space Cadet #2B2D42 ΔE 0.038
- Marine #042E60 ΔE 0.043
- Marine Blue #01386A ΔE 0.046
- Onyx #343A40 ΔE 0.053
Use #173550 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.