#172C59
Closest named color: Marine (#042E60). oklch(30.3% 0.085 263.4), rgb(23, 44, 89).
Aa
White text reads best on this color (13.62:1).
About this color
#172C59 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.085 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.018 away. White text reads best on it, at 13.62:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.54:1 |
| White text | 13.62:1 |
Values
| HEX | #172C59 |
| RGB | rgb(23, 44, 89) |
| HSL | hsl(221, 59%, 22%) |
| OKLCH | oklch(30.3% 0.085 263.4) |
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 #172C59 | 13.62:1 | AAA | Lc -103.1 | Preferred for body text |
| Black text on #172C59 | 1.54:1 | Fails | Lc 0.0 | Not readable |
| #172C59 text on white | 13.62:1 | AAA | Lc 99.9 | Preferred for body text |
| #172C59 text on black | 1.54:1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4781FF
oklch(63.2% 0.197 263.3)
-
Step 600
600
#2764F4
oklch(55.6% 0.225 263.4)
-
Step 700
700
#1B52D4
oklch(49.1% 0.208 263.3)
-
Step 800
800
#1844AC
oklch(42.8% 0.173 263.4)
-
Step 900
900
#193B88
oklch(37.7% 0.135 263.4)
-
Step 950
950 (this color)
#172C59
oklch(30.3% 0.085 263.4)
#172C59 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) | #15315B | 0.015 |
| Deuteranopia (no green cones) | #072B58 | 0.015 |
| Tritanopia (no blue cones) | #00363E | 0.068 |
| Achromatopsia (no color) | #2E2E2E | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #172C59
#172C59
oklch(30.3% 0.085 263.4)
- #3E2B00
#3E2B00
oklch(30.4% 0.062 82.4)
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 #172C59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.018
- Prussian Blue #1D3557 ΔE 0.031
- Marine Blue #01386A ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.055
- Gunmetal #293241 ΔE 0.057
- Midnight Green #073B4C ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.059
Use #172C59 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.