#17355E
Closest named color: Prussian Blue (#1D3557). oklch(32.9% 0.081 256.9), rgb(23, 53, 94).
Aa
White text reads best on this color (12.30:1).
About this color
#17355E is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.081 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.014 away. White text reads best on it, at 12.30:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.70:1 |
| White text | 12.30:1 |
Values
| HEX | #17355E |
| RGB | rgb(23, 53, 94) |
| HSL | hsl(215, 61%, 23%) |
| OKLCH | oklch(32.9% 0.081 256.9) |
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 #17355E | 12.30:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #17355E | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #17355E text on white | 12.30:1 | AAA | Lc 97.8 | Preferred for body text |
| #17355E text on black | 1.70:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF6
oklch(93.7% 0.017 256.3)
-
Step 200
200
#CBDAF0
oklch(88.4% 0.034 257.9)
-
Step 300
300
#A8C3E8
oklch(81% 0.06 256.3)
-
Step 400
400
#79A3DD
oklch(70.8% 0.097 256.6)
-
Step 500
500
#568AD4
oklch(63% 0.125 257.3)
-
Step 600
600
#3A73C1
oklch(55.6% 0.136 256.9)
-
Step 700
700
#2C60A6
oklch(49% 0.125 256.7)
-
Step 800
800
#264F87
oklch(42.8% 0.104 256.9)
-
Step 900
900 (this color)
#17355E
oklch(32.9% 0.081 256.9)
-
Step 950
950
#15273F
oklch(27% 0.051 256.1)
#17355E 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) | #223860 | 0.017 |
| Deuteranopia (no green cones) | #16325D | 0.010 |
| Tritanopia (no blue cones) | #003F45 | 0.064 |
| Achromatopsia (no color) | #353535 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17355E
#17355E
oklch(32.9% 0.081 256.9)
- #493000
#493000
oklch(33.1% 0.069 77.3)
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 #17355E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.014
- Marine Blue #01386A ΔE 0.024
- Marine #042E60 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.041
- Midnight Green #073B4C ΔE 0.043
- Gunmetal #293241 ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.059
Use #17355E 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.