#173554
Closest named color: Prussian Blue (#1D3557). oklch(32.3% 0.066 251.3), rgb(23, 53, 84).
Aa
White text reads best on this color (12.54:1).
About this color
#173554 is a dark, muted blue. In OKLCH its lightness is 32%, its chroma 0.066 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.009 away. White text reads best on it, at 12.54:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.67:1 |
| White text | 12.54:1 |
Values
| HEX | #173554 |
| RGB | rgb(23, 53, 84) |
| HSL | hsl(210, 57%, 21%) |
| OKLCH | oklch(32.3% 0.066 251.3) |
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 #173554 | 12.54:1 | AAA | Lc -101.7 | Preferred for body text |
| Black text on #173554 | 1.67:1 | Fails | Lc 0.0 | Not readable |
| #173554 text on white | 12.54:1 | AAA | Lc 98.3 | Preferred for body text |
| #173554 text on black | 1.67:1 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9BC5F2
oklch(80.9% 0.078 250.5)
-
Step 400
400
#62A5EC
oklch(70.7% 0.125 251.3)
-
Step 500
500
#2E8CE6
oklch(63.1% 0.16 251.3)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#084376
oklch(37.8% 0.103 250.9)
-
Step 950
950 (this color)
#173554
oklch(32.3% 0.066 251.3)
#173554 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) | #273755 | 0.021 |
| Deuteranopia (no green cones) | #1F3153 | 0.014 |
| Tritanopia (no blue cones) | #003C40 | 0.051 |
| Achromatopsia (no color) | #333333 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173554
#173554
oklch(32.3% 0.066 251.3)
- #482D04
#482D04
oklch(32.3% 0.066 71.6)
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 #173554, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.009
- Dark Blue Grey #1F3B4D ΔE 0.028
- Midnight Green #073B4C ΔE 0.029
- Marine #042E60 ΔE 0.037
- Gunmetal #293241 ΔE 0.038
- Marine Blue #01386A ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.041
- Onyx #343A40 ΔE 0.057
Use #173554 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.